Founding Engineer - London (up to £170k)

Dex; Greater London; On-site; GBP 120,000 - 180,000; Full time

Job summary

Dex, in partnership with a leading European services partner, is seeking a founding engineer to build an autonomous audit platform. You will own the agent layer that plans, executes, and checks audit work against international accounting standards.

Based in London and in-office most of the week, you will translate complex legal rules into autonomous code, working with licensed auditors to deliver production-grade solutions with deterministic results.

Qualifications

• Own and ship production software end to end with architectural accountability.
• Hands-on experience building, evaluating, and operating LLM systems in production.
• Ability to work with non-technical domain experts on complex workflows.
• Based in London and able to work in-office most of the week.

Responsibilities

• Architect and ship agent systems for planning, executing, and evaluating audit workflows against standards.
• Build evaluation machinery and feedback loops for self-checking evidence trails.
• Interface agent layer with deterministic transaction engine to verify ledger entries.
• Collaborate with state-authorised auditors to translate legal rules into autonomous code.
• Turn ambiguous technical problems into live production systems without waiting for tickets.

Skills

Production software ownership

LLM systems in production

Ambiguous workflow handling

Tools

Deterministic transaction engine

Job description

This role is with one of Dex's trusted partner companies. We work closely with their teams to truly understand their culture, goals, and what they're looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process.

The role

Statutory audit has relied for decades on manual sampling, opaque billing, and months of administrative friction. Backed by top-tier European seed funds, this company is replacing that paradigm with an autonomous operating system that tests every single transaction deterministically and delivers fully certified statutory sign-offs in days. As a founding engineer, you will own the agent layer that plans, executes, and checks audit work against international accounting standards. This is not an orchestration wrapper or a generic prompt-engineering seat; you will turn ambiguous one-sentence domain problems into dependable, self-improving agent architectures working alongside licensed auditors.

The work

• Architect and ship the agent systems responsible for planning, executing, and evaluating statutory audit workflows against regulatory standards.
• Build the evaluation machinery and feedback loops that allow agentic systems to reliably self-check their evidence trails.
• Interface the agent layer with a deterministic transaction engine to verify every single ledger entry rather than relying on statistical sampling.
• Work directly with state-authorised auditors to translate complex legal rules, materiality judgments, and evidentiary standards into autonomous code.
• Take ambiguous technical problems from initial concept to live production systems without waiting for tickets or detailed roadmaps.

What You Bring

• Track record of owning and shipping production software end to end, with direct accountability for architecture and outcomes.
• Deep, hands-on experience building, evaluating, and operating LLM systems in production, rooted in measurement rather than surface-level prompting.
• Demonstrated ability to break down complex, ambiguous real-world workflows directly alongside non-technical domain experts.
• Based in London and eager to work in-office alongside the core team most of the week.

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