Member of Technical Staff - Software Engineer

Job description

Tessl is a fast-growing Series A startup based in London, founded by Guy Podjarny. We’ve raised over $100M from world-class investors including Index Ventures, Accel, GV, and Boldstart, and in 2025 we were ranked #2 in Sifted EU’s B2B SaaS Rising 100 and #20 in Sifted's AI 100. At Tessl, we are building the context layer for AI coding agents, and a platform for AI-native software development. As an early member of the team, you’ll help shape how we build, scale and support a company operating at the edge of AI and software development. Overview of role Join our engineering team to build real-time AI Native workflows, tooling, and interfaces that will reshape how developers create and maintain software. As a Software Engineer, you’ll be versatile and independent, excited to work with cutting-edge AI tools to build great products. We move quickly, but with purpose - balancing speed with collaboration and thoughtful execution. You’ll collaborate closely with product, design, and the wider Engineering team to bring AI Native development to life in a fast-paced, high-trust environment. What you’ll do No two days will be the same at Tessl! You’ll have a high level of autonomy and be able to make decisions based on what you believe will help you deliver the most success. Here’s an insight into just a few of the things you would be doing: Design and implement new functionality that you discussed and reviewed with the product team Spin up a proof of concept to showcase an innovative idea you’ve been thinking about Rapidly prototype a new language integration for our code generation pipeline, then develop a plan for a scalable implementation. Pair with a designer to fine-tune interactions in the UI, CLI or existing AI coding agents, making the user experience more intuitive and slick Integrate a third-party service , e.g. for notifications, so we can focus our own cycles on Tessl’s core capabilities Collaborate with other teams to plan an architecture that supports collaboration across the platform Establish an end-to-end testing strategy to increase our confidence when deploying new features to production Share your technical vision for a new product capability you’ll be leading with the wider engineering team for feedback and alignment What we’re looking for Essential Proven experience (typically 5+ years or equivalent) as a Software Engineer . You care about code…