• Join our Core Platform team as a Senior Backend Java Engineer • Focus on backend systems development, building scalable enterprise-grade services • Work alongside DevOps and infrastructure teams in a modern cloud-native environment • Participate actively in Agile ceremonies and collaboration with cross-functional teams

Kunai builds full-stack technology solutions for banks, credit and payment networks, infrastructure providers, and their customers. Together, we are changing the world’s relationship with financial services. At Kunai, we help our clients modernize, capitalize on emerging trends, and evolve their business for the coming decades by remaining tech-agnostic and human-centered. Join our FinTech innovation journey to migrate and modernize personal loan platforms into a unified cloud ecosystem. You will be a vital part of a dynamic engineering team focused on backend API development utilizing Python and Golang, leveraging AI tooling to streamline platform migrations post-acquisition. Key Responsibilities: - Develop and maintain robust backend APIs to support our lending core abstraction layer. - Utilize containers and cloud services such as Jenkins, ECS, Fargate, Lambda to orchestrate reliable, scalable systems. - Monitor application performance using tools like Observe, NewRelic, AWS CloudWatch, and X-Ray. - Collaborate closely with cross-functional teams to ensure smooth platform migration and integration. - Apply your expertise with Claude/Windsurf/CoPilot AI tooling for enhanced development workflows. - Drive automation and continuous integration/continuous deployment (CI/CD) initiatives. Qualifications: - Strong proficiency in Golang and/or Python - Experience with backend API development - Familiarity with AWS cloud services including ECS, Fargate, Lambda - Knowledge of CI/CD pipeline tools like Jenkins - Experience with application performance monitoring tools such as NewRelic, AWS CloudWatch, X-Ray - Prior experience in platform migrations is highly desirable - Familiarity with AI-assisted development tools (Claude/Windsurf/CoPilot) Our success over the past 20 years is rooted in our exceptional team, which thrives in a culture of collaboration, creativity, and continuous learning. We are proud to offer our employees a range of benefits, including competitive compensation, professional development opportunities, and flexible work arrangements, all designed to help them thrive. As we continue to expand, we remain committed to cultivating an environment where people feel valued, have a voice, and are given the tools to grow—both personally and professionally—while pushing the boundaries of innovation in the fintech industry. Minimum Degree Required: - Bachelor’s Degree, in lieu of a degree, demonstrating in addition to the minimum years of experience required for the role, three years of specialized training and/or progressively responsible work experience in technology for each missing year of college is required

Role Description We are looking for a Backend Architect to join one of our biggest products - Cupid Media. Your main tasks will be: - Design and development of backend architecture (.NET); - Definition and implementation of architectural standards and best practices; - Design of backend services, APIs, and integrations; - Architecture and critical code review; - High-level effort estimation and validation of detailed technical estimates; - Communication with adjacent departments; - Ensuring scalability, performance, and reliability of backend systems. Qualifications - Strong knowledge of C# and .NET ecosystem (.NET Core / ASP.NET Core); - Solid understanding and practical application of OOP, SOLID principles, and common architectural patterns; - Proven experience designing backend architectures and scalable distributed systems; - Experience designing and developing RESTful APIs and backend services; - Strong knowledge of microservices architecture and service-to-service communication patterns; - Experience working with relational and/or NoSQL databases (e.g., PostgreSQL, MSSQL, MongoDB, Redis); - Understanding of system performance, scalability, reliability, and fault tolerance principles; - Experience with message brokers and asynchronous communication (Kafka, RabbitMQ, etc.); - Experience with cloud platforms and containerization (Docker, Kubernetes, AWS); - Strong code review, debugging, and problem-solving skills; - Experience defining architectural standards and validating technical solutions; - English from B1–B2 (good spoken English required); - Fluent Russian; - Ability to work in GMT+4-GMT+8. Benefits - REMOTE OPPORTUNITY to work full time; - Vacation: 28 calendar days per year; - 7 wellness days per year (time off) that can be used to deal with household issues, to lie down and recover without taking sick leave; - Bonuses up to $5000 for recommending successful applicants for positions in the company; - 50% payment for professional training, international conferences and meetings; - Corporate discount for English lessons; - Health benefits: up to $1,000 gross per year for self-purchase of health insurance or on doctor’s fees for yourself and close relatives (spouse, children); - Workplace organization: equipped workplace and necessary equipment provided in offices or co-working locations, reimbursement of workplace costs up to $1000 gross once every 3 years; - Internal gamified gratitude system: receive bonuses from colleagues and exchange them for merchandise, team building activities, massage certificates, etc.

• Design, develop, and maintain backend services and APIs. • Build and support critical data interfaces, including low-latency real-time streams (APIs, messaging) and high-volume batch/file-based data transfers. • Develop and maintain REST and GraphQL API integrations connecting frontend applications with backend services. • Write clean, maintainable, and efficient code following best practices. • Perform unit testing and ensure high code quality. • Optimize applications for performance, scalability, and reliability. • Implement robust error handling, caching, and data synchronization mechanisms. • Troubleshoot and resolve complex technical issues with minimal supervision. • Collaborate effectively with Business Analysts, Project Managers, and other development teams. • Stay up to date with technologies and trends in the payments and fintech industry.