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

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

5+ years of commercial experience as a Full-Stack Developer.
Strong expertise in JavaScript/TypeScript with proven experience building web applications using React, Next.js, Styled Components.
Solid backend experience with Node.js, databases (MariaDB/MySQL, DynamoDB, MSSQL, ElasticSearch), and GraphQL.
Knowledge of AWS (Lambda) and microservices architecture.
Hands-on involvement in CI/CD, QA, and testing activities.
Upper-Intermediate+ English proficiency.
Comfortable working independently and engaging directly with stakeholders to clarify requirements.

Nice-to-Have

Experience in fintech or credit/loan-related platforms.
Familiarity with observability tools (Datadog, Prometheus).
Exposure to distributed systems and multi-threading.
Strong understanding of performance and scalability challenges in financial systems.

Key Responsibilities

Deliver high-quality features covering both functional and non-functional requirements (security, performance, scalability).
Participate in technical discussions and own key technical decisions, ensuring alignment with best practices.
Design and implement end-to-end features across frontend and backend in a fast-paced environment.
Communicate effectively with both technical and non-technical stakeholders on a daily basis.
Refine requirements, manage dependencies, and contribute to backlog prioritization and planning.
Engage independently with stakeholders to translate business needs into working solutions.
Contribute to platform improvements and technical strategy.
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

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

Key Skills

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