London, England, United Kingdom · Hybrid
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 S…
Skills: Software engineering, AI coding tools, Rapid prototyping, System architecture, REST APIs
United Kingdom · Hybrid
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 S…
Skills: Technical Pre-sales, Solution Design, AI Tooling, Enterprise Sales, Customer Onboarding
London, England, United Kingdom · Hybrid
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 S…
Skills: Product Management, 0-to-1 Product Development, Developer Experience, AI-Native Product Practice, Technical Product Strategy
San Francisco, California, United States · Remote OK
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 S…
Skills: Developer Advocacy, Content Creation, Community Engagement, AI Development, Technical Writing
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You will design and implement new functionality for AI-native workflows while collaborating with product and design teams to build intuitive interfaces. Additionally, you will lead technical initiatives, prototype new integrations, and establish testing strategies to ensure scalable and reliable software deployment.
The role requires at least 5 years of software engineering experience with a strong focus on code modularity and structure. Candidates must demonstrate proficiency in leveraging AI coding tools and thrive in fast-paced, high-autonomy startup environments.
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.
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.
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
Proven experience (typically 5+ years or equivalent) as a Software Engineer. You care about code modularity, structure and aesthetics and have firsthand experience in how software is built across teams and environments
Equally comfortable contributing to a mature codebase with strict CI criteria or hacking up a quick prototype to prove/disprove an assumption
Proven experience leveraging the best AI coding tools and agents to accelerate and enhance your own work and efficiency
Comfortable with fast-paced, high-autonomy environments: you’ve ideally thrived in an early-stage startup before
You have demonstrated usage of AI tools in your day-to-day work, and be excited about experimenting, learning, and harnessing the potential of new AI tools and approaches to transform software engineering
Experience in rapid prototyping environments
Programming polyglot experienced in several languages of different paradigms (e.g.: JavaScript/TypeScript, Python, C or C++, Haskell, etc.)
Experience collaborating with AI researchers and bridging between research-focused and engineering-focused teams
Experience building & scaling REST APIs, particularly those conforming to JSON:API
Comfortable working on infrastructure (e.g., setting up CI pipelines, navigating Kubernetes)
If you have a personal or open-source project you’d like to share, we’d love to see it (GitHub links welcome!)
Office: Our brand new 10,000 sq. ft office is in the AI hub of Kings Cross, London. We have generous catering and have regular social events such as team lunches, drinks and more. We require all staff to be in our London HQ at least 3 days a week on our anchor days of Monday, Tuesday and Thursday.
Salary: We offer a competitive salary based on experience and skills, benchmarked against industry standards.
Benefits: 25 days holiday, health insurance, including dental and vision, which extends to partners and dependents, as well as a company-matched pension. We also provide a commuting stipend for those who live outside London, and a cycle to work scheme.
Here’s an outline of what you can expect during our interview process:
Introductory Call
Take-Home Exercise
On-site Technical Session
Culture Conversation
Leadership Discussion
Throughout the process, if you have any specific requirements or need adjustments, please let us know: we’re happy to accommodate.
We care deeply about the warm, inclusive environment we’re building at Tessl and we value diversity – we welcome applications from those typically underrepresented in tech. If you like the sound of this role but are not totally sure whether you’re the right person, do apply anyway!
Reimagining software development for the AI era, and shaping AI Native Software Development.
Tessl is the platform for building software factories. AI coding agents can write code fast, but most teams end up with a pile of one-off automations, not a system they can trust or scale. Tessl gives your team a working software factory without the headache: it extracts automated workflows and agent improvements so you don't have to, built on best-in-class factory components so your time goes into automating your work, not building plumbing. Your team builds it, one workflow at a time, catching insecure or low-quality skills before they ship, enforcing standards across every agent and repo, and turning one engineer's automation into a reusable asset for the whole org, without locking into a single vendor. Learn more at tessl.io.
Offices: London, GB
Reimagining software development for the AI era, and shaping AI Native Software Development.
Tessl is the platform for building software factories. AI coding agents can write code fast, but most teams end up with a pile of one-off automations, not a system they can trust or scale. Tessl gives your team a working software factory without the headache: it extracts automated workflows and agent improvements so you don't have to, built on best-in-class factory components so your time goes into automating your work, not building plumbing. Your team builds it, one workflow at a time, catching insecure or low-quality skills before they ship, enforcing standards across every agent and repo, and turning one engineer's automation into a reusable asset for the whole org, without locking into a single vendor. Learn more at tessl.io.
Offices: London, GB
