Principal Founding Engineer, Agent Systems

Role overview Build and advance AI agents that carry out accounting work inside financial systems, including ledger operations, reconciliations, close, and tax workflows. As a founding engineer, you will take broad problems from design through implementation and production proof, using sound judgment to ensure actions are supported by evidence and safe to execute.

Responsibilities - Own engineering problems end to end, shaping the approach and integrating working solutions into the product. - Use coding agents to accelerate implementation, then validate their output against real production systems. - Develop agent capabilities for financial workflows where incorrect actions can have material consequences. - Work within and contribute to controls such as confidence thresholds, review gates, audit trails, and system boundaries. - Assess whether a capability is sufficiently proven for production, and raise concerns when evidence is incomplete. - Help evolve a product already operating with a live write path into an ERP and real accounting data.

Requirements - Strong engineering fundamentals and the judgment to make progress on open-ended problems without relying on detailed tickets. - Ability to reason carefully about correctness, evidence, uncertainty, and the consequences of system actions. - Experience building systems deeply enough to explain their design and identify where assumptions may fail. - Willingness to use AI coding agents as a regular part of implementation and to verify their work rigorously. - Clear communication, including the ability to identify unknowns and explain what still needs validation.

Benefits and work setup - Founding engineering role reporting to the founder, with substantial ownership and influence over the product. - Remote opportunities across the UK, Luxembourg, Portugal, Spain, and elsewhere in the EU. - The hiring process consists of two technical conversations: collaborative problem-solving and a detailed discussion of a system you have built. No whiteboard exercise or unpaid project is described.