Fullstack Software Engineer

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 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 Fullstack Software Engineer (IC2) 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 meaningful work end-to-end and wants to contribute across the full software stack. You'll have the opportunity to work closely with Product, Design and Senior Engineers to build and ship features end-to-end. You'll be building real experience on systems used by thousands of businesses and millions of individuals 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 Software Engineer (IC2), 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 across the full stack, with experience in both backend and frontend development. Experience with Go, TypeScript or React is preferred, though we value strong fundamentals over any specific language or framework.
• 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 use AI tools to augment your workflow, accelerate learning, explore unfamiliar parts of the codebase and move faster on routine tasks.
• 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, Swift and Kotlin for our mobile applications
• Temporal for workflow orchestration
• PostgreSQL for relational data
• GCP for infrastructure, monitoring and analytics

Life at Thirdfort: Driven by our values, our culture promotes a collaborative and open environment where Thirdforters can take ownership, have impact, and feel empowered when it comes to their growth and development. We understand the importance of our teams' wellbeing and recognise a one-size fits all approach rarely works, that’s why we aim to provide the flexibility individuals need to work in the way that suits them, and their families, best.

Our Benefits: We’ve created our benefits package to reflect Thirdfort’s mission and values. We place a strong focus on Security first given what we do, extending this to our team’s physical, mental and financial security to support them through their big life moments. Our benefits exist to empower our team, ensuring they feel supported and able to work in the way that enables them to do their best work.

When you join Thirdfort, you’ll get immediate access to our flexible employee benefits package that aims to support you across these areas:

• Compensation - Up to 70k base salary
• Flexible Working Hours
• Enhanced parental leave
• Remote working within the UK only, with optional access to offices in London or Manchester
• Annual leave allowance of 26 days, increasing to 30 with tenure and the option to buy additional days
• Enhanced sick leave
• Private healthcare with our provider, AXA
• Regular company and team socials
• Uncapped budget for personal development
• Share options for all UK employees
• Customisable wellness budget and discounts on well-known brands

If you require any reasonable adjustments during the application or interview process, please let your dedicated Talent Partner know and we’ll do our best to accommodate.

We’re committed to building an inclusive, equitable and diverse culture where everyone has a chance to make a difference. We’re purposefully building a team of problem-solvers that reflect our values - which is why we hire from all backgrounds. If you're a curious, kind individual who takes ownership, you'll be a great Thirdforter.