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

Codurance; West of England; Hybrid; GBP 96,000 - 126,000; Full time

Job summary

Codurance seeks a Senior TypeScript Engineer to design, build, and operate Node.js services on AWS serverless in a FinTech context. You will join a cross-functional team and own delivery from architecture to production with a strong emphasis on correctness and reliability.

In this six-month contract role, you will mentor engineers, contribute to documentation, and help maintain SLAs while working in a flexible hybrid setup across London or other UK locations.

Qualifications

• Proven experience as a senior contract engineer on financial platforms.
• Strong skills in Node.js, TypeScript, and AWS serverless.
• Experience with event-driven architectures and document databases (MongoDB).
• Ability to design, build, and run services in production with ownership.
• Experience mentoring engineers and working in cross-functional teams.

Responsibilities

• 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
• Judge when 'good enough for now' is the right call
• Work openly with product and operations, and challenge ideas constructively

Skills

Node.js

TypeScript

AWS

Serverless

Mentoring

Incident management

FinTech domain

Event-driven

MongoDB

Technical leadership

Job description

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

Nice to have:

• Experience with multi-region, multi-currency or trading-related systems
• Terraform, Serverless Framework and GitHub Actions
• Some exposure to C#

How we work

We care about engineering quality, pragmatic architecture, and continuous improvement. You'll have autonomy, and with it, full accountability. We'd rather you tell us something is wrong than nod along.

Everyone should have the right to bring their whole self to work and be celebrated for who they are. Our people are hired purely on their commitment to these values and their ambition to deliver outstanding results for our clients. Codurance is proud to be an Equal Opportunities Employer and is committed to fostering an inclusive workplace.