Senior Software Engineer (Quality Engineering)

Thought Machine's mission is bold – to properly and permanently rid the world's banks of legacy technology. To achieve this, we have developed the foundations of modern banking through core and payments technology which run natively in the cloud. What we are attempting is hard and means we need great people working together to build great technology. We have grown rapidly in the past few years – growing our team to more than 550 individuals across offices in London, New York, Singapore, Sydney and our newly established Engineering Hub in Lisbon. We have raised more than £500m in funding and our investors include Molten Ventures, Eurazeo, Intesa Sanpaolo, Temasek, Nyca Partners, JPMorgan Chase Strategic Investments, Standard Chartered Ventures, and more. We have created a culture that enables our team to produce the best work in the industry while ensuring we have fun along the way. We're regularly cited as having a fantastic workplace culture and have been recognised by Sifted magazine as having one of the highest Glassdoor ratings for a UK fintech company and the industry's most generous employee share package. Named one of the world's most innovative fintechs by Global Finance Magazine, we were also recognised by the Financial Times as one of Europe's fastest-growing companies for two consecutive years—and a UK Best Employer for 2026. SENIOR SOFTWARE ENGINEER IN QUALITY ENGINEERING Thought Machine is building the backbone of critical banking infrastructure worldwide, empowering the world’s largest financial institutions to modernise their operations. In this high-stakes environment, producing quality software isn't just a best practice, it is a fundamental imperative and the foundation of our clients' trust. We invest heavily in our testing architecture because the reliability of our software is critical to the global financial ecosystem. We are seeking a Senior Software Engineer to drive quality engineering excellence, modern testing architecture and practices, and scalable infrastructure across our product engineering organisation. This is a rigorous, hands-on backend software engineering position, not a traditional QA or SDET role. We do not believe in siloed testing teams; instead, we believe in building intelligent, automated infrastructure and AI-driven developer tooling that make high-quality delivery the default. Why Join Us? In this role, you will have the unique opportunity to solve complex challenges at a massive scale, directly impacting the velocity of our engineering teams and the stability of global banks. We want engineers to be at the forefront of transforming our testing platforms from an internal utility into a powerful commercial asset. By providing total transparency into how we test, deepening our collaboration with clients, and exposing these capabilities externally via managed offerings like "Testing as a Service" (TaaS), you will fundamentally shift how the industry perceives software quality. You will work at the cutting edge of infrastructure and AI, honing your skills in building agentic tooling, advanced observability pipelines, and cloud-native platforms. This is a chance to elevate your career by architecting platforms that developers love and clients trust, all while shaping the engineering culture of a hyper-growth tech company. You will partner closely with engineering leadership, product management, and developer platform teams to design, architect, and implement industry-leading testing infrastructure. You will act as a technical leader championing testability, observability, and engineering best practices across the entire development lifecycle for all of our products. The Mentality We Are Looking For We value engineers who combine rigorous technical craft with ownership