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Software Engineer

Tessl

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Location:
United Kingdom , London

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

Not provided
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Job Description:

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.

Job Responsibility:

  • 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

Requirements:

  • Proven experience (typically 5+ years or equivalent) as a Software Engineer
  • 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

Nice to have:

  • Background in AI products or developer tools
  • 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!)
What we offer:
  • 25 days holiday
  • health insurance, including dental and vision, which extends to partners and dependents
  • company-matched pension
  • commuting stipend for those who live outside London
  • cycle to work scheme

Additional Information:

Job Posted:
February 01, 2026

Employment Type:
Fulltime
Work Type:
Hybrid work
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