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Senior Full Stack Engineer

Wearehaystack — United Kingdom · Posted ~9 hours ago

Senior

Skills

C# .NET Backend development Frontend development Vue.js React API design System design Distributed systems Architecture Testing Observability Production performance Reliability APIs

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Summary ✨ AI‑Generated

A global financial services organization is rebuilding a large-scale international payments platform and is seeking a Senior Full Stack Engineer. You will own features end-to-end, designing APIs and services in C# and .NET while delivering customer-facing functionality with Vue.js or React. The role includes architectural ownership, distributed systems, collaboration with product and compliance teams, and improving reliability, observability, testing, performance, and legacy-system modernization.

Highlights

Own features end-to-end across backend and frontend development, architecture, and production delivery. The role combines modern .NET engineering with customer-facing web development and offers substantial ownership of technical decisions, reliability, observability, testing, and modernization.

Description

We are working with a global financial services company that is rebuilding its international payments platform, operating within the Corporate Payments division. This organisation offers an exciting opportunity to contribute to cutting-edge financial technology in a dynamic environment. The Role Own features end-to-end, from API and service design through to frontend delivery and production. Design and develop scalable backend services and APIs using C# .Net. Build customer-facing features across both backend and Vue frontend. Own architecture and technical decisions within your domain. Collaborate with Product, Design, and Compliance to take features from idea to production. Improve reliability, observability, testing, and production performance, modernising legacy services. What You'll Need Strong C# .Net backend development experience. Good knowledge of frontend development, ideally with Vue.js or React. Strong API, system design, and distributed systems knowledge. Experience with SQL and relational databases. Experience with production AWS (CI/CD, SQS, DynamoDB, S3, ECS, or Lambda advantageous). Good understanding of microservices and event-driven architectures. Comfort taking technical ownership and mentoring others. What's On Offer Competitive salary to £85k + bonus. 23 days holiday, rising to 28, plus your birthday off. Comprehensive benefits: Pension, Life Assurance, Income Protection, Critical Illness Cover. Healthcare package. Apply via Haystack today!