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Tessl

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Raised $125M Series A on November 14, 2024

Raised $125M Series A on November 14, 2024

Tessl helps AI agents stay reliable and aligned by grounding their work in specs. Agents are powerful, but they can drift — misinterpreting requests, hallucinating APIs, or breaking existing features when adding new ones. Tessl integrates with most agents and uses spec-driven development to give agents (and you) a structured way to capture intent, run tests, and evolve codebases with fewer mistakes.

London, United Kingdom

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$125M Series A

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AI

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Remote

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11–50

Member of Design Staff - Product Designer

London Office · Posted on Mar 17, 2026

Member of Technical Staff - Engineering Lead

London Office · Posted on Mar 13, 2026

Member of Technical Staff - AI Engineer

London Office · Posted on Mar 6, 2026

Product Marketing Manager

London Office · Posted on Mar 5, 2026

Marketing Manager (Demand Generation)

London Office · Posted on Mar 5, 2026

Marketing/Content Designer

London Office · Posted on Jan 27, 2026

Member of Technical Staff - AI Engineer

London Office · Posted on Jan 20, 2026

Member of Technical Staff - Software Engineer

London Office · Posted on Jan 20, 2026

Member of Technical Staff - AI Engineering Lead

London Office · Posted on Jan 20, 2026

Member of Technical Staff - Forward Deployed Engineer

London Office · Posted on Jan 20, 2026

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