Refinery89

• Design, develop, and maintain robust, scalable backend services following Domain-Driven Design (DDD) principles • Take full technical ownership of features — from design through deployment and monitoring • Build and orchestrate agentic workflows : autonomous pipelines where AI models (Claude, LLMs) take actions, call tools, and solve tasks with minimal human intervention • Actively participate in architecture decisions with strong analytical thinking and technical depth • Ensure code quality through SDD, TDD, and BDD methodologies, with sharp attention to detail • Collaborate on code reviews, refinements, and technical planning • Proactively identify and address technical debt, performance bottlenecks, and security risks (OWASP, SOLID) • Build and maintain CI/CD pipelines across Bitbucket, GitLab, or GitHub • Produce well-reasoned technical designs before writing the first line of code

Role Description We're looking for a Senior Software Engineer with an Agentic mindset — someone who doesn't just write code, but builds systems that think, act, and adapt. You'll work on a production AdTech platform with real business impact, and you'll increasingly work alongside AI agents and design agentic workflows as part of your daily engineering practice. This is not a ticket-execution role. We expect you to bring judgment, ask the hard questions, design thoughtfully, and genuinely care about the quality of what you ship — whether that code was written by you, assisted by AI, or executed autonomously by an agent you designed. Responsibilities - Design, develop, and maintain robust, scalable backend services following Domain-Driven Design (DDD) principles. - Take full technical ownership of features — from design through deployment and monitoring. - Build and orchestrate agentic workflows: autonomous pipelines where AI models (Claude, LLMs) take actions, call tools, and solve tasks with minimal human intervention. - Actively participate in architecture decisions with strong analytical thinking and technical depth. - Ensure code quality through SDD, TDD, and BDD methodologies, with sharp attention to detail. - Collaborate on code reviews, refinements, and technical planning. - Proactively identify and address technical debt, performance bottlenecks, and security risks (OWASP, SOLID). - Build and maintain CI/CD pipelines across Bitbucket, GitLab, or GitHub. - Produce well-reasoned technical designs before writing the first line of code. Tech Stack - Languages: PHP (required), JavaScript / Node.js, Python, Rust (nice to have) - Frameworks & Tools: Laravel, Pest, Tailwind CSS, AWS (Lambda, SAM Templates, S3, CloudFront), Terraform, Playwright, Robot Framework, Cypress, Grafana, k6, Postman - Agentic & AI Tooling: Claude (Anthropic), Kiro, Experience building or working with LLM-powered agents, tool use, MCP integrations, or prompt engineering at an engineering level - Platform & Collaboration: Bitbucket, Jira / Atlassian suite, AdTech (nice to have), Google Ad Manager (GAM), Prebid.js, Prebid Server - Methodologies & Principles: SDD (Spec-Driven Development), TDD, BDD, SOLID, DDD, OWASP, CI/CD pipelines (Bitbucket Pipelines, GitLab CI, GitHub Actions) Qualifications - 5+ years of experience in backend or full-stack software development. - Practical experience with agentic AI systems — building agents, designing tool use, working with LLM APIs, or automating complex workflows with AI. - Strong technical analysis and design skills: you can break down complex problems, propose well-reasoned solutions, and think through the implications of architectural decisions. - Critical thinking: you don't execute blindly. You question, challenge, and improve — including the outputs of AI tools. - Attention to detail: the code you ship is clean, tested, and documented. You apply the same standard to AI-generated code. - True ownership: you're accountable for what you build — in production, over time. - Autonomy: you know how to move forward without hand-holding, and when to raise a flag. - Proactive attitude: you surface improvements, catch problems before they become incidents, and share knowledge freely. - Eagerness to learn: the agentic era is moving fast, and you're moving with it. - Fluent professional English, written and spoken. The team is fully remote and multicultural. Benefits - Full remote — work from anywhere within the European timezone (CET ±2h). - Small, technical team with minimal overhead. - Direct impact: your decisions ship to production. - A culture of honest feedback and continuous improvement. - Modern tooling — including cutting-edge AI — and freedom to propose new approaches. - A front-row seat to the agentic engineering shift, not just as a user but as a builder.

• Process and manage accounts payable invoices accurately and in a timely manner. • Prepare and execute weekly payment runs through banking platforms. • Review and approve employee expenses in accordance with company policies and procedures. • Review payroll information and support payroll-related accounting processes. • Maintain accurate accounting records and ensure proper documentation of financial transactions. • Respond to internal finance and accounting inquiries from employees and stakeholders. • Support the continuous improvement of accounting processes and internal controls. • Assist with recurring accounting activities and other finance-related projects as required.

Role Description We are looking for an Accountant to join our Finance team and take ownership of key accounting operations that support the day-to-day financial activities of the business. This role is ideal for an autonomous, organized, and detail-oriented professional who enjoys working independently while collaborating with colleagues across an international organization. The successful candidate will play an important role in ensuring the accuracy, efficiency, and reliability of our accounting processes. Responsibilities - Process and manage accounts payable invoices accurately and in a timely manner. - Prepare and execute weekly payment runs through banking platforms. - Review and approve employee expenses in accordance with company policies and procedures. - Review payroll information and support payroll-related accounting processes. - Maintain accurate accounting records and ensure proper documentation of financial transactions. - Respond to internal finance and accounting inquiries from employees and stakeholders. - Support the continuous improvement of accounting processes and internal controls. - Assist with recurring accounting activities and other finance-related projects as required. Qualifications - Minimum 5 years of experience in accounting or finance-related roles. - Professional fluency in both Spanish and English, written and spoken. - Strong attention to detail and accuracy. - Excellent organizational and time-management skills. - Ability to work autonomously and manage responsibilities independently. - Proactive, responsible, and solution-oriented mindset. - Strong collaboration and teamwork skills. Requirements - Nice to Have: Dutch language skills. - Experience working in international companies. - Experience in technology, digital media, AdTech, or fast-growing business environments. Benefits - Full-time position (37.5 hours per week). - 25 paid vacation days per year. - Standard Sanitas private medical insurance contribution according to company policy. - An international and collaborative work environment. - Flat organizational structure with a high degree of ownership and autonomy. - Opportunity to contribute to a growing AdTech company serving publishers across Europe. - A culture focused on transparency, continuous improvement, and operational excellence. Company Description At Refinery89, we help digital publishers maximize their advertising revenue through advanced programmatic technology, data-driven optimization, and strategic expertise. Headquartered in Madrid, with a growing international team, we work with publishers across Europe and beyond to make digital advertising more transparent, efficient, and impactful.

• Lead development of statistical and machine learning models to optimize performance • Design and execute A/B/n experiments for measurable improvements • Translate results into production-ready solutions • Collaborate with cross-functional stakeholders to identify use cases • Own the model lifecycle from ideation to performance monitoring • Present findings to technical and non-technical audiences • Contribute to data science practices and frameworks

Role Description We are looking for an experienced and highly analytical Data Scientist (Medior) to join our growing AI and Data team. If you're passionate about building intelligent systems that drive real business impact, thrive on solving complex problems, and want to shape the future of AdTech innovation, we'd love to meet you. - Lead the development of advanced statistical and machine learning models to optimize key performance parameters across our platforms (timeouts, refresh rates, ad placement logic, etc.). - Design and execute A/B/n experiments to test multiple parameter configurations simultaneously, driving measurable improvements in system efficiency and revenue outcomes. - Translate data and experimentation results into scalable, production-ready solutions that integrate seamlessly with our Product and Engineering teams. - Collaborate with cross-functional stakeholders—from Product to Commercial—to identify high-impact use cases and align technical outcomes with strategic goals. - Own the end-to-end lifecycle of models: from ideation, data wrangling, development, and deployment through to performance monitoring and optimization. - Present complex findings in a clear and actionable way to both technical and non-technical audiences. - Contribute to the continuous improvement of our data science practices, tooling, and experimentation frameworks. Qualifications - 2+ years of experience in Data Science, Machine Learning, or related analytical roles, ideally in fast-paced digital or AdTech environments. - Strong analytical mindset with the ability to turn business challenges into data-driven solutions. - Strong Python and SQL skills. - Proven experience with statistical modeling, experimentation, and machine learning frameworks such as scikit-learn, TensorFlow, or PyTorch. - Solid understanding of data manipulation, feature engineering, and model evaluation techniques. - Familiarity with cloud environments such as AWS or Azure. - Experience deploying and maintaining models within cloud infrastructure. - Hands-on experience designing, running, and analyzing A/B and multivariate tests with strong statistical rigor. - Understanding of experimental design, hypothesis testing, and causal reasoning. - Able to communicate complex technical concepts clearly to both technical and non-technical stakeholders. - Comfortable working across multiple teams and functions. - Understands that the success of an algorithm is measured not only by accuracy but also by its impact on product performance and business outcomes. Nice-to-Haves - Background in AdTech, programmatic advertising, or digital publishing. - Experience with LLMs, causal inference, or real-time prediction models. - Exposure to tools such as Airflow, Docker, or Spark in production environments. Benefits - A fully remote working environment. - A collaborative, international team with a strong knowledge-sharing culture. - A flat and fast-moving organization inspired by our Dutch roots. - Opportunities to work on high-impact projects at the intersection of AI, data, and programmatic advertising. - Regular team gatherings, knowledge-sharing sessions, and company events. - The opportunity to help shape the future of advertising technology through data-driven innovation. Employment Details - Permanent contract - Full-time - Remote (100%)

• Lead publisher acquisition efforts across the French market, from prospecting to closing. • Build and maintain a healthy pipeline of qualified opportunities through outbound outreach and networking. • Own the full sales cycle, including prospecting, qualification, discovery, relationship building, proposal discussions, negotiation, and closing. • Develop and execute market penetration strategies to expand Refinery89's presence in France. • Build trusted relationships with prospective and existing publishing partners. • Collaborate closely with operational and commercial teams to ensure a smooth onboarding experience for new clients. • Maintain accurate and up-to-date records of all sales activities within the CRM. • Consistently achieve and exceed monthly, quarterly, and annual sales targets.

Role Description As a commercial point of contact for the French market, you will be responsible for driving new business growth across France. This is a true hunter role with full sales cycle ownership. You will identify opportunities, build relationships with prospective publishers, manage the sales funnel, and close new business. Key Responsibilities - Lead publisher acquisition efforts across the French market, from prospecting to closing. - Build and maintain a healthy pipeline of qualified opportunities through outbound outreach and networking. - Own the full sales cycle, including prospecting, qualification, discovery, relationship building, proposal discussions, negotiation, and closing. - Develop and execute market penetration strategies to expand Refinery89's presence in France. - Build trusted relationships with prospective and existing publishing partners. - Collaborate closely with operational and commercial teams to ensure a smooth onboarding experience for new clients. - Maintain accurate and up-to-date records of all sales activities within the CRM. - Consistently achieve and exceed monthly, quarterly, and annual sales targets. Qualifications - Native-level French and professional fluency in English. - 2+ years of experience in B2B sales, business development, account acquisition, or a similar commercial role. - Proven experience in outbound sales activities, including cold calling, email outreach, LinkedIn prospecting, and virtual meetings. - Strong prospecting, qualification, negotiation, and closing skills. - Ability to build relationships and establish credibility with decision-makers. - Self-motivated, target-driven, and highly resilient. - Comfortable working independently while collaborating effectively with international teams. Nice to Have - Experience selling SaaS, Digital Marketing, Media, MarTech, AdTech, or other technology solutions. - Understanding of digital advertising, online publishing, or programmatic advertising. - Existing network within the French digital media, publishing, or advertising ecosystem. - Experience working in an international and multicultural environment. What Will Make You Successful - You enjoy hunting for new business opportunities and opening new accounts. - You are energized by ambitious sales targets and performance-based goals. - You know how to build pipeline consistently rather than relying solely on inbound opportunities. - You are confident managing the complete sales funnel, from first outreach through to signed contracts. - You combine persistence with a consultative sales approach and strong commercial judgment. Interview Process - Initial screening – Introductory call with a recruiter. - First interview – Video call with members of the Publisher Success team. - Second interview – Video call with the Hiring Manager and/or senior stakeholders. - Final interview – In-person meeting with the Hiring Manager and key team members. Ready to help shape the future of digital publishing and drive Refinery89's growth in France? We'd love to hear from you.

• Coordinate the onboarding of new mobile apps and publishers into the Refinery89 mediation ecosystem. • Guide publishers through onboarding requirements and implementation processes. • Act as a central operational point of contact during integration and rollout phases. • Track onboarding progress and ensure timely completion of implementation milestones. • Configure and manage ad units, placements, line items, and mediation settings. • Support the setup and optimization of mediation configurations across publisher accounts. • Assist with demand partner activation and bidder onboarding processes. • Maintain operational consistency across multiple publisher implementations. • Coordinate SDK onboarding activities with publishers and internal stakeholders. • Support integrations involving SDK bidders, mediation partners, and demand sources. • Assist with demand partner configuration, testing, and validation processes. • Identify, document, and track onboarding or implementation issues. • Collaborate with technical teams to troubleshoot configuration and setup challenges. • Validate successful deployment and operational readiness before launch. • Maintain onboarding trackers, rollout dashboards, and operational records. • Create and update onboarding documentation and internal process guidelines.

Role Description The Mobile AdTech Operations Specialist will play a key role in onboarding mobile publishers, supporting mediation and demand partner integrations, configuring ad inventory, and ensuring smooth operational rollout of mobile monetization solutions. This position is highly execution-focused and will work closely with the App Team, publishers, and monetization partners to streamline onboarding processes, reduce operational overhead, and accelerate publisher adoption of Refinery89’s mobile monetization stack. Key Responsibilities - Publisher Onboarding & Integration Coordination - Coordinate the onboarding of new mobile apps and publishers into the Refinery89 mediation ecosystem. - Guide publishers through onboarding requirements and implementation processes. - Act as a central operational point of contact during integration and rollout phases. - Track onboarding progress and ensure timely completion of implementation milestones. - Mediation & Ad Operations Management - Configure and manage ad units, placements, line items, and mediation settings. - Support the setup and optimization of mediation configurations across publisher accounts. - Assist with demand partner activation and bidder onboarding processes. - Maintain operational consistency across multiple publisher implementations. - SDK & Demand Partner Operations - Coordinate SDK onboarding activities with publishers and internal stakeholders. - Support integrations involving SDK bidders, mediation partners, and demand sources. - Assist with demand partner configuration, testing, and validation processes. - Ensure implementation requirements are completed accurately and efficiently. - Rollout Testing & Operational Support - Support rollout testing activities for newly onboarded publishers and applications. - Identify, document, and track onboarding or implementation issues. - Collaborate with technical teams to troubleshoot configuration and setup challenges. - Validate successful deployment and operational readiness before launch. - Documentation & Process Management - Maintain onboarding trackers, rollout dashboards, and operational records. - Create and update onboarding documentation and internal process guidelines. - Support the development of scalable operational workflows for the mobile monetization business. - Contribute to continuous improvements in onboarding efficiency and operational quality. Qualifications - Previous experience in Mobile AdTech, Ad Operations, Monetization Operations, or a related field. - Strong operational and project coordination skills. - Experience working with mobile app publishers or app monetization environments. - Ability to manage multiple onboarding projects simultaneously. - Strong problem-solving skills and attention to detail. - Excellent communication skills and ability to work with both technical and non-technical stakeholders. - Comfortable working in a fast-paced, international environment. - Professional fluency in English (written and spoken). Preferred Experience - Strong preference will be given to candidates with hands-on experience in one or more of the following platforms: - Google Ad Manager (GAM) - AdMob - AppLovin - Unity Ads - Meta Audience Network - InMobi - IronSource - Additional experience with the following is highly preferred: - Mobile mediation ecosystems - Mobile app monetization operations - SDK bidder onboarding - RTB and Open Bidding implementations - Waterfall mediation setups - Mediation platform operations - Mobile advertising workflows and troubleshooting Ideal Candidate The ideal candidate is an operationally focused AdTech professional who enjoys coordinating complex onboarding processes and ensuring flawless execution. They are comfortable working across technical and non-technical teams, proactively solving implementation challenges, and building scalable processes that support growth. You will be successful in this role if you: - Have a strong operational mindset. - Enjoy working at the intersection of technology and monetization. - Can independently troubleshoot onboarding and setup issues. - Are comfortable collaborating with publishers, product teams, and technical stakeholders. - Understand mobile app release, onboarding, and monetization processes. - Thrive in structured, process-driven environments while remaining adaptable to change. Why Join Refinery89 Joining Refinery89 means becoming part of an international team that is shaping the future of publisher monetization. You will have the opportunity to work with leading mobile monetization technologies, collaborate with experienced AdTech professionals, and contribute directly to the growth of our mobile business by helping publishers successfully scale their monetization strategy through Refinery89’s technology and expertise.