Contract Senior Typescript Engineer (Node.js, AWS Serverless)

Senior TypeScript Engineer (Node.js, AWS Serverless), FinTech

Location: London, Manchester, Leeds, Edinburgh or Bristol (flexible hybrid)

Rate: £600 per day. Inside IR35

Duration: 6 months

About Codurance

We're a software craftsmanship consultancy. We build software for clients, and we care about doing it properly: clean code, solid testing, sensible architecture, and teams that keep learning. Our engineers work embedded with client teams, so you get variety, real ownership, and the backing of a wider community of craftspeople who'll challenge you and help you grow.

The role

We're looking for a senior contract engineer to work on a financial platform where correctness actually matters. You'll design, build, and run TypeScript and Node.js services on AWS serverless infrastructure. You'll work in a small, cross-functional team alongside product, operations, and customer-facing colleagues, and you'll be the person people go to when they're stuck. This is a build-and-run environment: if you build it, you own it in production.

What you'll do day to day

• Design, build, and operate services within your domain, from architecture through to delivery • Take accountability for the SLAs of what you ship, and keep improving it • Write and maintain useful documentation for your services • Mentor and guide other engineers • Explain how the system works to non-technical colleagues, without making them feel daft for asking • Judge when "good enough for now" is the right call, and when it isn't • Work openly with product and operations, and challenge ideas constructively

Core skills:

• Strong commercial experience with Node.js and TypeScript • Hands-on AWS experience, including serverless (Lambda, SQS, EventBridge, API Gateway, S3, ECS) • Strong experience with event-driven architecture • Experience with document databases, ideally MongoDB • A track record of leading technical delivery in a build-and-run model • Experience mentoring other engineers • Experience with incident management • Experience in a regulated industry, ideally financial services or FinTech

Also important:

• Solid experience designing, building, and running high-quality workflow APIs, with a focus on testing, observability, and performance • Comfort working with distributed systems and debugging through tracing and observability tooling • Experience in a strongly, statically typed language • The ability to turn business and customer problems into efficient, scalable solutions • Curiosity about how investment and custody products work