Senior Software Engineer at UnlikelyAI

Job Title

Senior Software Engineer

Company Description

UnlikelyAI – Series A neurosymbolic AI startup

Job Description

Join the team building the future of reliable AI by combining LLMs with proprietary symbolic reasoning. You will architect a new public API and platform experience, transitioning bespoke enterprise technology into a scalable product. Work on novel problems at the intersection of probabilistic machine learning and deterministic classical computing for top-tier financial institutions.

Location

London, UK

Why this role is remarkable

• Work on a unique neurosymbolic stack that bridges the gap between LLMs and deterministic logic, founded by the creator of Amazon Alexa.
• Join a Series A company already delivering high-stakes solutions to top-tier financial institutions and accountancy firms where accuracy is non-negotiable.
• Play a pivotal role in a major architectural shift from bespoke customer engagements to a global, scalable public API platform.

What you will do

• Design and build the infrastructure for a new public API, including authentication systems, scalability patterns, and developer documentation.
• Develop symbolic reasoning engines that represent complex regulatory knowledge as machine-evaluable rules and knowledge graphs.
• Scale document ingestion pipelines and evaluation frameworks to measure and improve system accuracy across diverse enterprise data formats.

The ideal candidate

• Exceptional Python engineer with experience writing well-typed, production-quality code in a collaborative monorepo environment.
• Strong background in complex algorithms and data structures, capable of solving non‑trivial problems in symbolic AI or knowledge representation.
• Proven track record of end‑to‑end ownership, taking brand‑new software systems from ideation through to production in a fast‑paced environment.

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