Title: Senior Software Engineer, AI Location: Madrid Office Type: Permanent Full Time Employee Workplace: hybrid Category: 13001 - Engineering Job Description: Aircall is a unicorn, AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, resolve issues faster, and scale customer-facing teams. We’re redefining customer communications by bringing voice, SMS, WhatsApp, and AI together into one seamless workspace. Our momentum comes from a simple idea: help teams work smarter, not harder. Aircall’s AI Voice Agent automates routine calls, AI Assist streamlines post-call work, and AI Assist Pro delivers real-time guidance so people can do their best work. The result is higher revenue, faster resolutions, and teams that scale with confidence. Aircall is headquartered in Paris, our European HQ, with a strong North American presence anchored in Seattle, our North American HQ, and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We’ve built a product customers love and a business that’s scaling quickly, backed by world-class investors and driven by rapid AI innovation across multiple product lines. At Aircall, you’ll join a company in motion. We’re ambitious, product-driven, and execution-focused, with visible impact, fast decisions, and real growth. How we work at Aircall: We’re customer-obsessed, data-driven, and focused on delivering meaningful outcomes. We value ownership, continuous learning, and thoughtful speed. If you thrive in a collaborative, fast-moving environment where trust and impact matter, you’ll feel at home here. The Role As a Senior Backend & AI Engineer, you will be responsible for the design, development, deployment, and operation of business-critical AI features. Previous experience implementing AI features is a must. Best practices, evangelization, and mentoring in your team and across all of Engineering will be a part of your day to day job. Quality, excellence, and agility drive our delivery processes and you will help us level these up. You will be building practical applications such as chatbots, virtual assistants, automated content generation, and other NLP-powered tools. You will use and fine-tune existing LLMs to cater to specific business needs and domains, ensuring high performance in real-world applications. Your Responsibilities @ Aircall - Collaborate on requirements analysis to design the right technical and business solutions for our customers. - Propose innovative solutions by staying ahead of AI landscape trends and emerging technologies. - Own key responsibilities in the design, architecture, and end-to-end delivery of AI-driven modules. - Write clean, scalable, and maintainable code while ensuring proper testing, deployment, and monitoring. - Continuously improve code quality through regular refactoring, debugging, and performance enhancements. - Contribute to building secure, high-quality AI solutions that power Aircall’s customer experience. - Optimize product and platform performance and ensure reliability through live site monitoring. - Participate in an on-call rotation to handle critical incidents and maintain system uptime. Qualifications: - AI experience is a must for this position: Strong knowledge of LLMs and hands-on experience building with them - including usage, prompting and model integration. - Familiarity with AI frameworks (e.g., LangChain, LlamaIndex, AutoGen) and modern AI architectures such as RAG, vector databases, reranking, and performance optimization. - 5+ years of experience in back-end development using Python, TypeScript/Node.js, or Java, with a focus on security, scalability, availability, and performance. - Full-stack development experience is a strong plus. - Nice to have: Ideally you will have worked with AWS in a production environment and understand how to design for, deploy on and get the best out of, the environment and services provided by Amazon. - Security is at the forefront of your mind in everything that you do. Why join us? Key moment to join Aircall in terms of growth and opportunities Our people matter, work-life balance is important at Aircall Fast-learning environment, entrepreneurial and strong team spirit 45+ Nationalities: cosmopolite & multi-cultural mindset Competitive salary package & benefits Medical, dental, and vision insurance is 100% covered 401k plan with company matching! Unlimited PTO — take the time you need to come to work feeling great! Wellness, commuter, and childcare reimbursements Generous parental leave policy

Title: Arabic (Tunisian) Language Instructor, eMentor Location: US Remote Job Description: Description Summary: ABOUT THE ORGANIZATION Yorktown Systems Group, Inc., and its wholly-owned subsidiaries, are a committed team of dedicated former military and civilian professionals who believe in providing ethical and quality services to Government customers. Our leadership team is composed primarily of Veterans who are now serving in a corporate environment rather than in uniform. Our customer's missions become our own and we are committed to working as a team to achieve success. Because of the depth and experiences of our corporate leadership, we can assure all our customers that "we will do what we say we can do" and will focus on our customer's missions rather than corporate goals. Our business model is based on a personal commitment from our leaders to maintain contact with our customers to continually and consistently gauge our performance. Yorktown Systems Group was founded on the idea that providing quality and ethical services with a laser focus on our customer's goals is an effective long-term business model. Our mission, therefore, is to help our customers meet their requirements and goals. The contractor will not discharge or in any other manner discriminate against any employee or applicant for employment because such employee or applicant has inquired about, discussed, or disclosed the compensation of the employee or applicant or another employee or applicant. This provision shall not apply to instances in which an employee who has access to the compensation information of other employees or applicants as a part of such employee's essential job functions discloses the compensation of such other employees or applicants to individuals who do not otherwise have access to such information, unless such disclosure is in response to a formal complaint or charge, in furtherance of an investigation, proceeding, hearing, or action, including an investigation conducted by the employer, or is consistent with the contractor's legal duty to furnish information. The Unconventional, LLC is a wholly-owned subsidiary of Yorktown Systems Group, Inc. Job Title Arabic (Tunisian) Language Instructor, eMentor Location Maxwell Air Force Base, AL - Maxwell Air Force Base, AL 36113 US Remote (Virtual) - US - US (Primary) Job Description Summary: The Unconventional is seeking a qualified Language Instructor to support The Language Enabled Airman Program (LEAP) and the Air Force Culture and Language Center (AFCLC). LEAP is an AFCLC-managed, volunteer, career-spanning program that develops language-enabled, cross-culturally competent service members across the General Purpose Force (GPF) with working-level foreign language proficiency. With these skills, Airmen and Guardians who are deliberately developed as LEAP Scholars are better equipped to support the application of airpower by sharing regional security burdens through strengthened partnerships, developing interoperability, and understanding adversaries. eMentor courses assess, enhance, and sustain service members’ language skills throughout their careers. Instruction is participant-centered and tailored to each learner’s needs within the structure of the provided curriculum. Courses target growth in all four modalities (listening, speaking, reading, and writing), build cross-cultural knowledge, and strengthen intercultural communication skills. Designed to support operational demands, courses are available 24/7 across all time zones to support a globally distributed force, with both scheduled courses and OnDemand session options. Instruction takes place one-on-one or with groups of two to four Scholars. eMentor online courses connect service members synchronously with native-speaking instructors, at times that align with each Scholar’s availability. Specific duties may include, but are not limited to: - Administer the eMentor curricula (syllabi and lesson plans) provided by the Client - Prepare instructional aids (e.g., presentation slides, digital whiteboard content) and supporting open-source materials for each session. - Instructional aids shall be prepared IAW industry’s best practices for instructional quality and effectiveness. - Operate UCC platform tools including launching live sessions, managing audio/video, screen sharing, chat, and materials, support Scholar access and keyboard setup, adjust bandwidth settings, and troubleshoot routine technical issues during instruction. - Deliver instruction aligned with lesson objectives and plans, incorporating cultural, technical, military, and geopolitical content (including open-source materials) to support language development and mission-relevant understanding for Scholars at ILR Level 2 and above. - Provide one-on-one feedback, review homework and assessments, and monitor attendance to support Scholar language development and course progress. - Support OnDemand session scheduling functions in the Language Enabled Development Resource (LEaDeR) application by coordinating weekly schedule availability with the ISS. Job Requirements Required Qualifications: - Must possess language skills in the target language(s) equivalent to an ILR Advanced Professional Proficiency or a “Superior” rating in speaking and writing on the American Council for the Teaching of Foreign Languages (ACTFL) proficiency scale for each language and dialect they will instruct - Must hold at least a bachelor’s level degree in language instruction or a related social science field, such as History, Political Science, International Relations, Anthropology, Archeology, and Cultural Geography, and/or possess a minimum of five years of embedded experience in the target culture(s). - Must be capable of delivering instruction and conducting assessments across proficiency levels ranging from ILR level 0 through ILR Level 3+. - Extensive global regional expertise. - Extensive knowledge of foreign language teaching techniques and instructional systems. - Extensive knowledge of learning theory, the psychology of learning, educational psychology, and Instructional Product Development. - Extensive knowledge of instructional design practices, principles, techniques, and curriculum development. - Extensive knowledge of standardized, web-based, interactive course delivery systems. - Extensive expertise in instructor facilitation and faculty development. - Extensive knowledge of the use of computers in education and training. - Demonstrated knowledge and skill in multimedia design and delivery methods (e.g., imbedded video instruction). - General knowledge of and competency with Microsoft Office applications (e.g., Word, Excel, PowerPoint, Access), Adobe Acrobat Professional, and other common productivity software. - eMentors may be dual nationals who are native to regions where the language is commonly spoken and/or professional language instructors with demonstrated expertise in the relevant cultures and customs. Clearance: Must be able to pass a background check Location: Montgomery, AL / Remote Travel: No travel required Security Clearance Travel No travel required Job Type Part-time Exemption Type Non-Exempt Category Contractors EEO STATEMENT Yorktown Systems Group, Inc., and its wholly-owned subsidiaries, are an Equal Opportunity Employer. No employee or applicant for employment is denied equal opportunity because of race, color, sex, national origin, religion, age, disability, marital status, pregnancy, sexual orientation, gender identity, genetic information, any other non-merit-based factor, or other characteristics protected by law. As part of the company's equal employment opportunity policy, Yorktown Systems Group, Inc., and its subsidiaries, will also take affirmative action as called for by applicable laws and Executive Orders to ensure that minority group individuals, females, disabled veterans, recently separated veterans, other protected veterans, Armed Forces service medal veterans, and qualified disabled persons are introduced into our workforce and considered for promotional opportunities. The Unconventional, LLC. is a wholly-owned subsidiary of Yorktown Systems Group, Inc.

Title: Arabic (Algerian) Language Instructor, eMentor Location: Remote (Virtual) - US - US (Primary) Job Description: ABOUT THE ORGANIZATION Yorktown Systems Group, Inc., and its wholly-owned subsidiaries, are a committed team of dedicated former military and civilian professionals who believe in providing ethical and quality services to Government customers. Our leadership team is composed primarily of Veterans who are now serving in a corporate environment rather than in uniform. Our customer's missions become our own and we are committed to working as a team to achieve success. Because of the depth and experiences of our corporate leadership, we can assure all our customers that "we will do what we say we can do" and will focus on our customer's missions rather than corporate goals. Our business model is based on a personal commitment from our leaders to maintain contact with our customers to continually and consistently gauge our performance. Yorktown Systems Group was founded on the idea that providing quality and ethical services with a laser focus on our customer's goals is an effective long-term business model. Our mission, therefore, is to help our customers meet their requirements and goals. The contractor will not discharge or in any other manner discriminate against any employee or applicant for employment because such employee or applicant has inquired about, discussed, or disclosed the compensation of the employee or applicant or another employee or applicant. This provision shall not apply to instances in which an employee who has access to the compensation information of other employees or applicants as a part of such employee's essential job functions discloses the compensation of such other employees or applicants to individuals who do not otherwise have access to such information, unless such disclosure is in response to a formal complaint or charge, in furtherance of an investigation, proceeding, hearing, or action, including an investigation conducted by the employer, or is consistent with the contractor's legal duty to furnish information. The Unconventional, LLC is a wholly-owned subsidiary of Yorktown Systems Group, Inc. Job Title Arabic (Algerian) Language Instructor, eMentor Location Maxwell Air Force Base, AL - Maxwell Air Force Base, AL 36113 US Remote (Virtual) - US - US (Primary) Job Description Summary: The Unconventional is seeking a qualified Language Instructor to support The Language Enabled Airman Program (LEAP) and the Air Force Culture and Language Center (AFCLC). LEAP is an AFCLC-managed, volunteer, career-spanning program that develops language-enabled, cross-culturally competent service members across the General Purpose Force (GPF) with working-level foreign language proficiency. With these skills, Airmen and Guardians who are deliberately developed as LEAP Scholars are better equipped to support the application of airpower by sharing regional security burdens through strengthened partnerships, developing interoperability, and understanding adversaries. eMentor courses assess, enhance, and sustain service members’ language skills throughout their careers. Instruction is participant-centered and tailored to each learner’s needs within the structure of the provided curriculum. Courses target growth in all four modalities (listening, speaking, reading, and writing), build cross-cultural knowledge, and strengthen intercultural communication skills. Designed to support operational demands, courses are available 24/7 across all time zones to support a globally distributed force, with both scheduled courses and OnDemand session options. Instruction takes place one-on-one or with groups of two to four Scholars. eMentor online courses connect service members synchronously with native-speaking instructors, at times that align with each Scholar’s availability. Specific duties may include, but are not limited to: - Administer the eMentor curricula (syllabi and lesson plans) provided by the Client - Prepare instructional aids (e.g., presentation slides, digital whiteboard content) and supporting open-source materials for each session. - Instructional aids shall be prepared IAW industry’s best practices for instructional quality and effectiveness. - Operate UCC platform tools including launching live sessions, managing audio/video, screen sharing, chat, and materials, support Scholar access and keyboard setup, adjust bandwidth settings, and troubleshoot routine technical issues during instruction. - Deliver instruction aligned with lesson objectives and plans, incorporating cultural, technical, military, and geopolitical content (including open-source materials) to support language development and mission-relevant understanding for Scholars at ILR Level 2 and above. - Provide one-on-one feedback, review homework and assessments, and monitor attendance to support Scholar language development and course progress. - Support OnDemand session scheduling functions in the Language Enabled Development Resource (LEaDeR) application by coordinating weekly schedule availability with the ISS. Job Requirements Required Qualifications: - Must possess language skills in the target language(s) equivalent to an ILR Advanced Professional Proficiency or a “Superior” rating in speaking and writing on the American Council for the Teaching of Foreign Languages (ACTFL) proficiency scale for each language and dialect they will instruct - Must hold at least a bachelor’s level degree in language instruction or a related social science field, such as History, Political Science, International Relations, Anthropology, Archeology, and Cultural Geography, and/or possess a minimum of five years of embedded experience in the target culture(s). - Must be capable of delivering instruction and conducting assessments across proficiency levels ranging from ILR level 0 through ILR Level 3+. - Extensive global regional expertise. - Extensive knowledge of foreign language teaching techniques and instructional systems. - Extensive knowledge of learning theory, the psychology of learning, educational psychology, and Instructional Product Development. - Extensive knowledge of instructional design practices, principles, techniques, and curriculum development. - Extensive knowledge of standardized, web-based, interactive course delivery systems. - Extensive expertise in instructor facilitation and faculty development. - Extensive knowledge of the use of computers in education and training. - Demonstrated knowledge and skill in multimedia design and delivery methods (e.g., imbedded video instruction). - General knowledge of and competency with Microsoft Office applications (e.g., Word, Excel, PowerPoint, Access), Adobe Acrobat Professional, and other common productivity software. - eMentors may be dual nationals who are native to regions where the language is commonly spoken and/or professional language instructors with demonstrated expertise in the relevant cultures and customs. Clearance: Must be able to pass a background check Location: Montgomery, AL / Remote Travel: No travel required Security Clearance Travel No travel required Job Type Part-time Exemption Type Non-Exempt Category Contractors EEO STATEMENT Yorktown Systems Group, Inc., and its wholly-owned subsidiaries, are an Equal Opportunity Employer. No employee or applicant for employment is denied equal opportunity because of race, color, sex, national origin, religion, age, disability, marital status, pregnancy, sexual orientation, gender identity, genetic information, any other non-merit-based factor, or other characteristics protected by law. As part of the company's equal employment opportunity policy, Yorktown Systems Group, Inc., and its subsidiaries, will also take affirmative action as called for by applicable laws and Executive Orders to ensure that minority group individuals, females, disabled veterans, recently separated veterans, other protected veterans, Armed Forces service medal veterans, and qualified disabled persons are introduced into our workforce and considered for promotional opportunities. The Unconventional, LLC. is a wholly-owned subsidiary of Yorktown Systems Group, Inc.

Title: Amharic Language Instructor, eMentor Job Description: ABOUT THE ORGANIZATION Yorktown Systems Group, Inc., and its wholly-owned subsidiaries, are a committed team of dedicated former military and civilian professionals who believe in providing ethical and quality services to Government customers. Our leadership team is composed primarily of Veterans who are now serving in a corporate environment rather than in uniform. Our customer's missions become our own and we are committed to working as a team to achieve success. Because of the depth and experiences of our corporate leadership, we can assure all our customers that "we will do what we say we can do" and will focus on our customer's missions rather than corporate goals. Our business model is based on a personal commitment from our leaders to maintain contact with our customers to continually and consistently gauge our performance. Yorktown Systems Group was founded on the idea that providing quality and ethical services with a laser focus on our customer's goals is an effective long-term business model. Our mission, therefore, is to help our customers meet their requirements and goals. The contractor will not discharge or in any other manner discriminate against any employee or applicant for employment because such employee or applicant has inquired about, discussed, or disclosed the compensation of the employee or applicant or another employee or applicant. This provision shall not apply to instances in which an employee who has access to the compensation information of other employees or applicants as a part of such employee's essential job functions discloses the compensation of such other employees or applicants to individuals who do not otherwise have access to such information, unless such disclosure is in response to a formal complaint or charge, in furtherance of an investigation, proceeding, hearing, or action, including an investigation conducted by the employer, or is consistent with the contractor's legal duty to furnish information. The Unconventional, LLC is a wholly-owned subsidiary of Yorktown Systems Group, Inc. Location Maxwell Air Force Base, AL - Maxwell Air Force Base, AL 36113 US Remote (Virtual) - US - US (Primary) Job Description Summary: The Unconventional is seeking a qualified Language Instructor to support The Language Enabled Airman Program (LEAP) and the Air Force Culture and Language Center (AFCLC). LEAP is an AFCLC-managed, volunteer, career-spanning program that develops language-enabled, cross-culturally competent service members across the General Purpose Force (GPF) with working-level foreign language proficiency. With these skills, Airmen and Guardians who are deliberately developed as LEAP Scholars are better equipped to support the application of airpower by sharing regional security burdens through strengthened partnerships, developing interoperability, and understanding adversaries. eMentor courses assess, enhance, and sustain service members’ language skills throughout their careers. Instruction is participant-centered and tailored to each learner’s needs within the structure of the provided curriculum. Courses target growth in all four modalities (listening, speaking, reading, and writing), build cross-cultural knowledge, and strengthen intercultural communication skills. Designed to support operational demands, courses are available 24/7 across all time zones to support a globally distributed force, with both scheduled courses and OnDemand session options. Instruction takes place one-on-one or with groups of two to four Scholars. eMentor online courses connect service members synchronously with native-speaking instructors, at times that align with each Scholar’s availability. Specific duties may include, but are not limited to: - Administer the eMentor curricula (syllabi and lesson plans) provided by the Client - Prepare instructional aids (e.g., presentation slides, digital whiteboard content) and supporting open-source materials for each session. - Instructional aids shall be prepared IAW industry’s best practices for instructional quality and effectiveness. - Operate UCC platform tools including launching live sessions, managing audio/video, screen sharing, chat, and materials, support Scholar access and keyboard setup, adjust bandwidth settings, and troubleshoot routine technical issues during instruction. - Deliver instruction aligned with lesson objectives and plans, incorporating cultural, technical, military, and geopolitical content (including open-source materials) to support language development and mission-relevant understanding for Scholars at ILR Level 2 and above. - Provide one-on-one feedback, review homework and assessments, and monitor attendance to support Scholar language development and course progress. - Support OnDemand session scheduling functions in the Language Enabled Development Resource (LEaDeR) application by coordinating weekly schedule availability with the ISS. Job Requirements Required Qualifications: - Must possess language skills in the target language(s) equivalent to an ILR Advanced Professional Proficiency or a “Superior” rating in speaking and writing on the American Council for the Teaching of Foreign Languages (ACTFL) proficiency scale for each language and dialect they will instruct - Must hold at least a bachelor’s level degree in language instruction or a related social science field, such as History, Political Science, International Relations, Anthropology, Archeology, and Cultural Geography, and/or possess a minimum of five years of embedded experience in the target culture(s). - Must be capable of delivering instruction and conducting assessments across proficiency levels ranging from ILR level 0 through ILR Level 3+. - Extensive global regional expertise. - Extensive knowledge of foreign language teaching techniques and instructional systems. - Extensive knowledge of learning theory, the psychology of learning, educational psychology, and Instructional Product Development. - Extensive knowledge of instructional design practices, principles, techniques, and curriculum development. - Extensive knowledge of standardized, web-based, interactive course delivery systems. - Extensive expertise in instructor facilitation and faculty development. - Extensive knowledge of the use of computers in education and training. - Demonstrated knowledge and skill in multimedia design and delivery methods (e.g., imbedded video instruction). - General knowledge of and competency with Microsoft Office applications (e.g., Word, Excel, PowerPoint, Access), Adobe Acrobat Professional, and other common productivity software. - eMentors may be dual nationals who are native to regions where the language is commonly spoken and/or professional language instructors with demonstrated expertise in the relevant cultures and customs. Clearance: Must be able to pass a background check Location: Montgomery, AL / Remote Travel: No travel required Security Clearance Travel No travel required Job Type Part-time Exemption Type Non-Exempt Category Contractors EEO STATEMENT Yorktown Systems Group, Inc., and its wholly-owned subsidiaries, are an Equal Opportunity Employer. No employee or applicant for employment is denied equal opportunity because of race, color, sex, national origin, religion, age, disability, marital status, pregnancy, sexual orientation, gender identity, genetic information, any other non-merit-based factor, or other characteristics protected by law. As part of the company's equal employment opportunity policy, Yorktown Systems Group, Inc., and its subsidiaries, will also take affirmative action as called for by applicable laws and Executive Orders to ensure that minority group individuals, females, disabled veterans, recently separated veterans, other protected veterans, Armed Forces service medal veterans, and qualified disabled persons are introduced into our workforce and considered for promotional opportunities. The Unconventional, LLC. is a wholly-owned subsidiary of Yorktown Systems Group, Inc.