Senior Full-Stack Developer (Node.js+React) (#5399)

11 липня 2026

Senior Full-Stack Developer (Node.js+React) (#5399)

Київ, Львів, Дніпро, Вінниця, Івано-Франківськ, Тернопіль, Краків (Польща), Вроцлав (Польща), віддалено

N-iX is looking for a Full-Stack Engineer (Node.js+React) for a London-based fintech startup building a digital marketplace for the secondary private credit market. The platform enables institutional investors to buy and sell credit positions, co-invest in large deals, access liquidity before loan maturity, and receive AI-generated deal tear sheets and fair asset valuations. You’ll join a three-person full-stack engineering team covering backend (distributed systems, multi-threading), frontend (UX/UI), and DevOps (AWS architecture, observability, CI/CD).

Requirements

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  5+ years of commercial experience as a Full-Stack Developer.

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  Strong expertise in JavaScript/TypeScript with proven experience building web applications using React, Next.js, Styled Components.

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  Solid backend experience with Node.js, databases (MariaDB/MySQL, DynamoDB, MSSQL, ElasticSearch), and GraphQL.

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  Knowledge of AWS (Lambda) and microservices architecture.

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  Hands-on involvement in CI/CD, QA, and testing activities.

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  Upper-Intermediate+ English proficiency.

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  Comfortable working independently and engaging directly with stakeholders to clarify requirements.

Nice-to-Have

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  Experience in fintech or credit/loan-related platforms.

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  Familiarity with observability tools (Datadog, Prometheus).

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  Exposure to distributed systems and multi-threading.

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  Strong understanding of performance and scalability challenges in financial systems.

Key Responsibilities

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  Deliver high-quality features covering both functional and non-functional requirements (security, performance, scalability).

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  Participate in technical discussions and own key technical decisions, ensuring alignment with best practices.

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  Design and implement end-to-end features across frontend and backend in a fast-paced environment.

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  Communicate effectively with both technical and non-technical stakeholders on a daily basis.

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  Refine requirements, manage dependencies, and contribute to backlog prioritization and planning.

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  Engage independently with stakeholders to translate business needs into working solutions.

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  Contribute to platform improvements and technical strategy.

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  Drive engineering quality by reviewing code, contributing to testing, CI/CD, and QA processes.

We offer*:

• Flexible working format — remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers