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
Skills Required
- 5+ years of commercial experience as a Full-Stack Developer
- Strong expertise in JavaScript and TypeScript, with 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 or higher English proficiency
- Comfortable working independently and engaging directly with stakeholders to clarify requirements
- Experience in fintech or credit/loan-related platforms
- Familiarity with observability tools (Datadog, Prometheus)
- Exposure to distributed systems and multi-threading
- Understanding of performance and scalability challenges in financial systems
What We Do
N-iX is a global software solutions and engineering services company that helps world’s leading organizations turn challenges into lasting business value, operational efficiency, and revenue growth using advanced technology. Whether you need to build a custom solution, modernize your digital product or acquire extra tech expertise - we have the experience and capabilities to ensure your success. With over 2,000 professionals in 25 countries across Europe and the Americas, N-iX offers expert solutions in cloud, data analytics, embedded software, IoT, AI, machine learning, and other tech domains. Being in business for over two decades, we have worked with dozens of industry-leading enterprises and Fortune 500 companies creating value across a wide variety of sectors, including finance, manufacturing, supply chain, retail, e-commerce, healthcare, and more. Our unique combination of business domain expertise and technical know-how enables us to effectively collaborate with ISVs, tech companies, and enterprises of all sizes. Thanks to the strong tech ecosystem and partnerships with AWS, GCP, Microsoft, SAP, OpenText, Snowflake, and others, we bring extra speed, scale and efficiency to more than 160 organizations across the globe. N-iX is recognized by numerous industry awards, such as CRN Solution Provider 500, Global Outsourcing 100 by IAOP, ISG Provider Lens™, Modern Application Development services providers by Forrester, etc
