Jobs and Careers
TH
Senior Software Engineer
ThirdfortUKRemotefull_timeVerifiedPosted 17 Dec 2025
💰 £100,000/yr(£25,000/yr – £100,000/yr)
About the role
We’re on a mission to protect society from fraud and money laundering. We’ve already protected over 3 million people through life’s big transactions.
Fraud and regulation are rising, costing the UK economy over £100bn every year; this makes it more difficult for businesses to protect themselves and their clients - individuals like you and me - from fraud and money laundering.
Our co-founders Olly and Jack were led to this area when a friend was defrauded of £25K when buying their first property. At the time, anti-fraud technology didn’t exist, which meant that completing the anti-fraud checks required in these processes was largely manual. These big life moments should be exciting, but instead are often confusing and scary due to the painful process of completing these paper-based checks and the risk of fraud.
Thirdfort helps businesses to facilitate these anti fraud checks so that individuals know they can transact safely and seamlessly with professionals during these big transactions. Our anti-fraud platform provides a secure way for professionals in regulated sectors like Lawyers, Estate Agents and Accountants to transfer funds and verify sensitive information through app based document checks, facial recognition and open banking.
Over 1,500 businesses now trust Thirdfort to verify their clients. We are FCA regulated and have raised over $33m in capital from leading Fintech investors Breega and Element Ventures, as well as the founders of Zoopla, Funding Circle, Comply Advantage, Tessian, Fenergo and Fidel.
About the Role:
We’re looking for a Senior Software Engineer to join one of our cross-functional product teams and help us build reliable, scalable systems that protect our customers and their clients from fraud.
This is a great opportunity for an engineer who enjoys owning problems end-to-end, working closely with Product and Design, and steadily growing their technical depth and impact. You’ll be contributing to production systems used by thousands of businesses, while learning how to operate effectively in a regulated, high-trust domain.
You won’t be expected to have all the answers on day one but you will be expected to be curious, collaborative, and willing to take ownership of meaningful pieces of work.
About the Team:
Our engineering teams are remote-first, mixed-discipline product teams made up of backend, frontend and mobile engineers, working closely with Product Managers, Designers and other stakeholders.
We focus on delivering value in small, iterative increments, balancing speed with quality and long-term maintainability. Our ways of working evolve as we learn, currently blending elements of Scrum, Shape Up and continuous delivery, and we encourage engineers at all levels to help improve how we build software.
Fraud and regulation are rising, costing the UK economy over £100bn every year; this makes it more difficult for businesses to protect themselves and their clients - individuals like you and me - from fraud and money laundering.
Our co-founders Olly and Jack were led to this area when a friend was defrauded of £25K when buying their first property. At the time, anti-fraud technology didn’t exist, which meant that completing the anti-fraud checks required in these processes was largely manual. These big life moments should be exciting, but instead are often confusing and scary due to the painful process of completing these paper-based checks and the risk of fraud.
Thirdfort helps businesses to facilitate these anti fraud checks so that individuals know they can transact safely and seamlessly with professionals during these big transactions. Our anti-fraud platform provides a secure way for professionals in regulated sectors like Lawyers, Estate Agents and Accountants to transfer funds and verify sensitive information through app based document checks, facial recognition and open banking.
Over 1,500 businesses now trust Thirdfort to verify their clients. We are FCA regulated and have raised over $33m in capital from leading Fintech investors Breega and Element Ventures, as well as the founders of Zoopla, Funding Circle, Comply Advantage, Tessian, Fenergo and Fidel.
About the Role:
We’re looking for a Senior Software Engineer to join one of our cross-functional product teams and help us build reliable, scalable systems that protect our customers and their clients from fraud.
This is a great opportunity for an engineer who enjoys owning problems end-to-end, working closely with Product and Design, and steadily growing their technical depth and impact. You’ll be contributing to production systems used by thousands of businesses, while learning how to operate effectively in a regulated, high-trust domain.
You won’t be expected to have all the answers on day one but you will be expected to be curious, collaborative, and willing to take ownership of meaningful pieces of work.
About the Team:
Our engineering teams are remote-first, mixed-discipline product teams made up of backend, frontend and mobile engineers, working closely with Product Managers, Designers and other stakeholders.
We focus on delivering value in small, iterative increments, balancing speed with quality and long-term maintainability. Our ways of working evolve as we learn, currently blending elements of Scrum, Shape Up and continuous delivery, and we encourage engineers at all levels to help improve how we build software.
As a Senior Software Engineer, you will:
- Design, build and ship well-tested features across our platform, with support from more senior engineers.
- Take ownership of user stories from refinement through to production and post-release support.
- Collaborate closely with Product and Design to understand problems and translate requirements into pragmatic technical solutions.
- Write clean, maintainable code and contribute to improving code quality through reviews and refactoring.
- Participate in incident investigation and support, helping to improve system reliability and observability over time.
- Continuously develop your technical skills and broaden your understanding of the wider system.
- Contribute positively to our engineering culture by sharing knowledge, asking questions, and supporting your teammates.
We’d love to hear from you if:
- You have experience building and shipping production software as part of a team.
- You’re comfortable working with at least one modern backend or frontend language (for example Go, TypeScript, JavaScript, Python).
- You understand core engineering fundamentals such as APIs, data modelling, testing, and version control.
- You enjoy solving problems end-to-end and taking responsibility for your work.
- You can communicate clearly with both technical and non-technical stakeholders.
- You’re happy working in a fast-moving environment where requirements may evolve as we learn more.
Studies show that women and people from underrepresented backgrounds are less likely to apply unless they meet every requirement. If you don’t tick every box but feel this role could be a great fit, we’d still love to hear from you.
We use and teach:
- We’re passionate about supporting your growth and helping you become confident working across the stack. Depending on the team, you’ll have the opportunity to work with and learn:
- Go for backend services
- TypeScript and React for web applications
- React Native
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