Middle Full-Stack Engineer (Node.js+React)

N-iX is looking for a Middle Full-Stack Engineer (Node.js and React) to join our team!

Our client is a London-based fintech startup developing a digital marketplace for the secondary private credit market. The platform enables institutional investors to buy and sell credit positions, participate in co-investments, access liquidity before loan maturity, and leverage AI-powered insights, including automated deal summaries and fair asset valuations. The project involves building and enhancing the platform with a dedicated full-stack engineering team, covering backend development (distributed systems and multithreading), frontend development (UX/UI), and cloud infrastructure and observability (AWS, Datadog, Prometheus, and CI/CD).

Responsibilities:

Ensure high-quality delivery covering both functional and non-functional requirements (security, performance, scalability etc)
Participate in technical discussions and own key technical decisions, ensuring solutions are aligned 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 from the client side 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 and CI/CD, etc.

Requirements:

3+ 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.

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

Middle Full-Stack Engineer (Node.js+React)

Key Skills

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