Senior Backend Engineer (Payments focused)

Senior Backend Engineer (Payments focused) Position Title: Senior Backend Engineer (Payments focused) Department: Business & Product Reports To: Technical Delivery Manager Location: Remote / Europe Date: ASAP Projects & Initiatives: Multi-project Node.js       NestJS       Stripe (Adyen, Checkout.com, PayPal)       PostgreSQL       Microservices 1. Job Purpose We're a fast-growing tech company with a portfolio of SaaS products serving diverse industries. Innovation, performance, and design precision are core to our values. As we scale, we're looking for a Senior Back-End Engineer to take a key role in crafting highly performant, maintainable, and user-focused web applications, with a strong focus on payments infrastructure across multiple products. 2. Key Responsibilities – Participate in daily team routines, stand-ups, sprint planning, and retrospectives. – Actively contribute to sprint work: feature development, code reviews, and merge requests. – Develop testable, maintainable code; troubleshoot and debug issues as they arise. – Gather and evaluate requirements in collaboration with the Tech Lead, Product Manager, and fellow engineers. – Translate requirements into solid backend features – Integrate software components into a fully functional system – Collaborate effectively with Product, Engineering, QA, and Customer Support – Integrate with third-party APIs and monitor system performance – Apply engineering best practices and agreed standards consistently – Prepare and present technical ideas to internal teams and stakeholders 3. Requirements MUST HAVE – 5+ years of commercial experience with Node.js and RESTful APIs – 1+ year of commercial experience with NestJS – 1+ year integrating and maintaining Stripe – 1+ year integrating and maintaining a payment orchestration platform, Primer, Gr4vy, or Spreedly – Proficient in English, written and spoken ALSO REQUIRED – Hands-on experience with the full payment lifecycle: ◦ Authorization, capture, refunds, webhooks, reconciliation ◦ Third-party API integrations – Thorough understanding of web application and microservice architecture – Comprehensive understanding of OOP, design patterns, and service-oriented architecture – Advanced PostgreSQL experience with ORM: ◦ Designing scalable schemas ◦ Performance optimization ◦ Schema and data migrations under heavy load – Experience with unit and integration tests, e.g., Jest – Experience with observability and monitoring in distributed environments, e.g., GroundCover – Knowledge of application performance optimization techniques – Understanding of web technologies – Comfortable with Docker and Kubernetes – Hands-on with modern AI development tools, e.g., GitHub Copilot, Cursor, ChatGPT, or similar – Strategic thinker with a problem-solver mindset – Able to work autonomously in a fast-paced, agile, remote environment – Strong communication skills and experience working with distributed teams 4. Nice to Have – Experience with other payment processors, Adyen, Checkout.com, and PayPal – Understanding of payment performance processes, EFWs, chargebacks, and refunds – Experience with Redis – Familiarity with CI/CD tools and practices – Experience with AWS – React.js / Next.js – HTML / CSS – Experience with SaaS products – Past or current Tech Lead experience 5. What We Offer – Full-time, long-term role – 22 days paid leave + local bank holidays – 100% remote – Flexible hours, core window 7:00–18:00 EET – High-traffic, global SaaS products, real scale, real impact