Senior Full-Stack Engineer

Senior Full-Stack Engineer – New York – On-Site – Opportunity to join one of the Fastest-Growing and Well-Known Fin-Tech Start-Ups in NYC This young and agile company, building a cutting-edge commerce network is currently seeking a talented Senior Full-Stack Engineer to work on high-impact projects. You will assist with the continuous expansion and optimization of their services in a frontier space. This is an excellent opportunity for an experienced Full-Stack Engineer to take the next step into a challenging position with a company offering significant growth potential. About the Company: Valued at over $10bn having raised over $250m in their Series B funding in 2025.Launched in the 2020’s, this is phenomenal growthTheir network has already reached more than 4.5 million peopleThey have already acquired some smaller FintechsThey launched their new product in 2026 About the Senior Full Stack Engineer Vacancy: In this position, you will: • Work across the full lifecycle of projects - from scoping and technical roadmapping to production and deployment • Have your say in technical conversations, code reviews, and architectural decision-making • Adapt to the demands of various projects and issues by working across the stack as needed • Use Node.js frameworks (NestJS, Hono, Express) to create and manage backend services. • Use Next.js, React, and React Native to create efficient front-end experiences. • Work together with design teams to utilise our design system on mobile and web platforms. • Create schemas, optimise queries, and guarantee data integrity using relational databases (PostgreSQL). • Put into effect and uphold observability techniques, such as distributed tracing, structured logging, and monitoring Ideal Requirements for the Senior Full Stack Engineer Vacancy: • Several years of professional software development experience • Strong proficiency in React, TypeScript, and modern JavaScript • Hands-on experience with Node.js backend development using frameworks like NestJS, Express, or Hono • Experience with Next.js and/or React Native for building production applications • Solid understanding of relational databases (PostgreSQL preferred), including data modeling and query optimization • Familiarity with state management patterns and libraries (Redux or similar) • Experience working with design systems and component libraries • Understanding of observability fundamentals: logging, tracing, metrics, and alerting • Experience designing systems that scale—caching strategies, async processing, API design • Proficiency with Git and modern CI/CD workflows • Strong problem-solving skills and attention to detail • Solid understanding of RESTful APIs and web services • Excellent communication and collaboration abilities Apply to the Role: Roles like these are snapped up very quickly, so act now if you do not want to miss out! Reply to this advert or email your CV to richard@weareorbis.com