Member of Technical Staff (Platform Leaning)

Tessl is a fast-growing Series A startup based in London, founded by Guy Podjarny, who previously founded Snyk. We’ve raised more than $100 million from world-class investors, including Index Ventures, Accel, GV and Boldstart. In 2025, Tessl ranked #2 in Sifted’s B2B SaaS Rising 100 and #20 in its AI 100. We’re 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 and scale a company operating at the forefront 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. This is a product engineering role with a platform twist. Most of your time, you'll do what every Tessl engineer does: design, prototype and ship product features end to end, collaborating closely with product, design and the wider engineering team in a fast-paced, high-autonomy environment. What makes you different is that when the work goes below the application layer, you light up rather than back away: complex networking scenarios such as site-to-site VPN and private connectivity, multi-cloud and multi-region deployments, observability, and the machinery that makes Tessl straightforward to deploy, operate and support wherever it needs to run. We expect you to be relentlessly AI native about it: instead of triaging alerts at 2 am, you'll build or deploy the agent that does it. Instead of reacting to scaling bottlenecks, you'll create systems that spot them before they happen. Deep expertise is the foundation, because you can't automate what you don't know, but your ambition should be to make agents do the bulk of the operational work, with you supervising and steering. We're open on level for this role, from mid-level to senior: trajectory and appetite matter more to us than years. What success looks like: Within your first year, you're shipping product features end to end like any Tessl engineer. When infrastructure work arises, from deployment architecture to networking to observability, you're the one who takes it on and lands it well, with support where you need it. Our deployment and operational practices are stronger because of you, agentic tooling handles a growing share of the toil, and the infrastructure work you touch is compliant by default, keeping our ISO 27001 and SOC 2 journey unblocked.

No two days will be the same at Tessl! You'll have a high level of autonomy and be empowered 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: Product engineering (most of your time) Design and implement new functionality end to end, from initial design and prototypes to fully scoped production implementations, reviewed with the product team Rapidly prototype new capabilities to prove or disprove an idea, then develop a plan for a scalable implementation Pair with designers and other engineers to make the experience intuitive and slick, and integrate third-party services so we can focus our cycles on Tessl's core capabilities Gather requirements from customers and stakeholders, turn ambiguity into agreed plans, and deliver them Platform & infrastructure Lean into infrastructure work as it arises: our AWS estate (EKS/Kubernetes), infrastructure-as-code, CI/CD with GitHub Actions, and our observability stack (Dash0/OpenTelemetry, Sentry, PostHog) Contribute to the architecture & build of our more complex networking and deployment scenarios, such as private connectivity and multi-region setups Improve developer experience and platform ergonomics so every engineer at Tessl ships faster Partner with our Infosec team so that everything you build is compliant by default, contributing infrastructure controls and evidence towards ISO 27001 and SOC 2 AI-native automation Build or deploy agentic tooling