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# Software Engineer

- **Company:** Thirdfort
- **Location:** London, UK
- **Experience:** Expert
- **Salary:** £100,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Amazon Web Services, Application Integration Architecture, Mobile Application Development, Code Review, Cursor (Graphical User Interface Elements), TypeScript, Workflow Management Systems, Cloud Platform System, ReactJS, Backend, Event Driven Architecture, Front End Software Development, Programming Languages
- **Published:** September 21, 2026
- **Apply:** https://startup.jobs/senior-software-engineer-thirdfort-10136192

## About the Role

* Have strong backend service experience in a modern programming language, with the ability to ramp up quickly in Go
 * Have experience designing, building, and integrating APIs
 * Have experience working in cloud environments (AWS and/or GCP)
 * Have taken ownership of ambiguous technical problems and seen them through with minimal oversight
Nice to haves:

 * Have experience with workflow orchestration or event-driven systems (e.g. Temporal)
 * Are comfortable using AI coding tools (e.g. Copilot, Cursor, Claude Code) as part of your everyday workflow
 * Have experience working across a legacy-to-modern platform migration
 * Have some experience with React/TypeScript and/or mobile development
"Studies show that women and other less represented groups are less likely to apply for roles unless they meet every requirement. We believe in building a diverse team, valuing different skills and experiences and so if you don't think you have all the requirements listed here but feel this could be a role and environment you'd thrive in, we would still love for you to apply."

## Description

* Helping lead the rebuild of our tenant referencing product, migrating it from our legacy platform onto Thirdfort's strategic engineering platform (Go, Temporal-based workflows), working across both systems during the transition
 * Designing and building backend services and APIs that power tenant referencing checks, and contributing to our frontend (React/TypeScript) and mobile platforms when needed
 * Making independent architecture and delivery decisions on a fast-moving, still-forming squad, working closely with our Product & Tech Lead
 * Upholding engineering quality through testing, observability, and code review, as we build permanent engineering ownership into the team
 * Partnering closely with Ops and Support to understand real tenant referencing workflows and translating that understanding into good technical decisions
 * Using modern engineering practices, including AI-assisted development, to build new check types and features quickly without sacrificing quality
 * Mentoring and uplifting engineering practices across the squad as it grows