cover image
Twelve

Contract Software Engineer

Hybrid

London, United kingdom

Freelance

19-12-2025

Share this job:

Skills

Python Java Go Kotlin TypeScript CI/CD Architecture .NET

Job Specifications

CONTRACT - Senior / Staff / Principal Software Engineers | UK Challenger Bank | Liverpool St | 2-days on site | Outside IR35

We're working with an established UK Challenger Bank entering a significant scale-up phase and looking for exceptional talent to level-up the engineering org.

We're not looking for people with "X years in Y language", we want to speak to systems thinkers who care about scalable architecture, continuous deployment, clean code, business value and user experience - regardless of whether your background is Java, Go, Python, Kotlin, .NET, TypeScript, Data or anything else.

Product-Minded: You don't just build to spec; you care about why you’re building it and the value it adds to the customer.
Engineering Maturity: You understand TDD, CI/CD, and how to build resilient distributed systems.
Collaboration: You enjoy mentoring, peer-reviewing, and raising the bar for an entire engineering organisation.
Tech-Agnostic: You’re comfortable working across the stack or even moving into new domains (Fullstack, Data, or Platform).

Interested? We aren't looking for a perfect CV match; we’re looking for great engineers. If you’re tired of being boxed in by a specific language and want to work on complex, high-scale problems, please apply and let’s talk.

About the Company

Tech hiring has been the same for decades. Overpriced. Slow. Inefficient...what if it wasn't? Our founders have combined 30 years expertise across exec search, internal rec and agency. They've led talent strategy for companies like Trainline, Moonpay and Checkout, and recruited for 100's of tech brands like McKinsey, Just Eat, and Monzo. Salaries in the technology sector have risen faster than inflation for years, meaning recruitment fees have enjoyed the same trend. In a market where tech talent is more accessible than ever... Know more