Senior Software Engineer II

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. As a Senior Software Engineer II, you operate with a wide sphere of influence. You will own complex, highly ambiguous technical challenges end-to-end, handling unexpected hurdles independently and gracefully. Your role goes beyond individual team delivery; you will drive systemic, organizational change and shape the long-term technical direction of our platforms. You will actively drive our engineering and company principles by aligning with our broader codebase, architecture, objectives, and goals, while acting as a crucial link between senior leadership, external stakeholders, and engineering teams. WHAT YOU’LL DO Technical Leadership - Design & Build: Create solutions to highly complex problems, utilising a deep understanding of the codebase and architecture, and lead the direction for future technical change. - Architecture & Standards: Utilise expertise to enable solutions to meet security, performance, cost, reliability, maintainability, and scalability requirements in a repeatable way and beyond existing capabilities, shaping the overall technical direction. Take part in defining standards and engineering practices for the entire company. Drive adoption of latest technologies, such as AI-tools, to scale developer velocity and code quality, keeping Thought Machine always ahead of the curve. - Technical Direction: Keep a pulse on industry-leading software trends and best practices, introducing new tools and processes that shape Thought Machine's technical roadmap. - Code Quality & Peer Review: Provide technical leadership and guidance to support others, ensuring their work items consider broader impact, long-term outcomes, and strategic direction end-to-end. - Operational Excellence: Investigate complex issues spanning across services in non-local or production environments (including across environments, clusters, and products), and possess a deep understanding to drive improvements to operational and production support processes. - Hiring: Lead technical interviews to actively evaluate the capability of Subject Matter Experts (SMEs) and leadership roles.. Product & Delivery - End-to-End Ownership: Own the solution to work items of undefined scope and high complexity end-to-end, handling unexpected complexity gracefully and independently. Drive delivery requiring effective and timely stakeholder management across larger milestones, which can potentially span multip