Software Engineer

About us

At ZeroKey, we’re on a mission to build innovative solutions that integrate technology within the UK financial advice market. Founded in December 2023, our solution quickly won Best in Show at The Lang Cat’s inaugural AdviceTech Catwalk. Today, we are working with and providing critical infrastructure to some of the biggest and most exciting fintechs operating in the industry, from FTSE 250 companies to AI start-ups. We’re a small, ambitious team with previous start and scale up experience now looking to accelerate. If you want to join early and make a visible impact within a company that’s already making headlines, this is the opportunity.

The role

This is a rare chance for a mid-level Software Engineer to join an early-stage fintech and directly influence a company that is already working with some of the biggest names in the UK financial advice market. You’ll take ownership of designing and implementing APIs that move data between systems, and contribute to the APIs we offer so others can connect with us. You’ll work across a modern TypeScript-based stack, building everything from backend services to browser extensions and front-end tooling. You’ll be reporting into the Head of Software Engineering with direct access to the CEO.

What you’ll do

• Build and maintain integrations with third-party systems.
• Extend our own API for external provider connections.
• Ship Node.js backend services and TypeScript browser extensions.
• Work with Vue.js on user-facing components.
• Plan, test, and deliver features with the wider team.
• Write clean, well-documented, testable code.
• Review pull requests and mentor new starters.

What we’re looking for

• A mid-level Software Engineer with a minimum 3 years of experience
• Strong TypeScript and JavaScript proficiency.
• Proven Node.js service and API experience in production.
• Vue.js or other modern front-end framework experience.
• A track record of integrating disparate systems and third-party APIs.
• Self-motivated, with the drive to take ownership and deliver.
• A team player who communicates well and takes pride in their craft.

Nice to have

• Experience with Laravel or PHP.
• Familiarity with REST API design principles.
• Exposure to cloud platforms (e.g., AWS).
• Interest or experience in using AI tools to enhance development productivity (e.g. code generation, testing, MCP or automation).

Why you’ll love it here

• Be one of the first engineers at a company that is already providing infrastructure for some of the biggest fintechs in UK financial advice.
• Grow at your own pace in an environment that trusts you to know what you're doing and gives you the space to do it.
• Real problems, real partners, real impact – your work will make a real difference to how financial advisers work every day
• Work directly with a founding team that's already built and scaled a fintech from start-up through to exit.