Dolfin AI
Software Engineer
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About Dolfin
We're building the agentic financial ops API for SMB platforms. Fintechs, vertical SaaS, banks, and PSPs use Dolfin to embed AI-native financial ops agents (invoicing, bills, expenses etc) directly into their products. White-label, API-first, production-ready.
Our agents live in production with real SMBs. We're live and moving fast: signed platform clients including a unicorn, pipeline in the $M's, and part of Balderton's latest 'Launched' cohort.
Role Overview
We're looking for a Senior Backend Engineer to build the core of the platform alongside the founding team. This is a deep, heads-down build role: design and ship the systems everything else runs on, and own them in production.
Responsibilities
- Design, build, and own core backend services, APIs, and infrastructure.
- Build the event-driven, multi-tenant systems partners embed into their products.
- Ship LLM and agentic workflows into production, where correctness and reliability actually matter.
- Own the hard parts: data models, state machines, failure modes, audibility, performance.
- Take features from spec to production and stand behind them once live.
- Partner directly with the founders on architecture and technical trade-offs.
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How We Build
- Production-first. If it isn't live and reliable, it isn't done.
- Correctness is non-negotiable - reliability, auditability, and failure modes come first.
- Pragmatic, not dogmatic. Boring tech where it counts, bold choices only where they differentiate.
- AI-native. LLMs as infrastructure, not features.
- Built to embed. API-first and multi-tenant from the ground up.
- Small team, high trust. Judgement over process, every time.
Requirements
- 4+ years shipping and owning production backend systems.
- A fintech background is essential - ideally fintech API infrastructure (payments, ledgers, accounting, banking, open finance). You've built or integrated financial APIs and understand what breaks.
- Deep experience with event-driven, multi-tenant backends and the correctness demands of money movement.
- Genuinely autonomous: take an ambiguous problem, make the call, ship it.
- Comfortable operating without structure, and creating it.
- Able to jump into frontend when a feature genuinely needs it.
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Bonus:
- Hands-on with LLMs/agentic systems, payment or open-banking integrations (Stripe, Yapily), or time at an API-led fintech (Codat, TrueLayer, GoCardless, Modulr).
Who This Is For
Engineers who want to go deep on hard backend problems. Builders who've shipped zero-to-one and owned it in production. People who make the call rather than wait to be told.
Not for:
- Fully remote candidates,
- Big-company pace,
- Anyone who needs tightly scoped tickets.
Why Us
- Genuine early-team role with meaningful equity.
- Real production AI systems, not experiments.
- Deep ownership of the systems the whole product runs on, and a hand in shaping the architecture and engineering culture from day one.
Location:
Southbank, London, in-person. Full-time. Let's go!
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