Jack & Jill
Senior Backend Engineer (£65k–£95k + Equity) at Dolfin
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Senior Backend Engineer
Salary: £65k–£95k + Equity
Company Description
Dolfin is a Balderton-backed fintech building the first agentic financial ops API for SMB platforms. Part of the Balderton Launched program, Dolfin enables banks and vertical SaaS to embed AI-native agents for invoicing and expenses. With a unicorn client already signed and a multi-million pound pipeline, they are leading the shift from copilots to autonomous finance.
Location
London, UK
Why this role is remarkable
- Build production-ready AI agents rather than simple demos, shipping real LLM-driven workflows that manage mission-critical operations for enterprise-scale platforms.
- Join an elite early-stage team part of Balderton’s Launched program, working directly with founders to shape the technical architecture and culture from the ground up.
- Tackle deep backend challenges in a high-growth category, with the autonomy to own significant surface area and make high-impact technical decisions from day one.
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What You Will Do
- Design and own core backend services, APIs, and event-driven infrastructure that partners embed directly into their vertical SaaS or banking products.
- Implement complex state machines and data models that ensure absolute correctness and auditability for financial processes like invoicing, bills, and automated expenses.
- Partner with the founders to navigate technical trade-offs, scaling the platform to handle multi-million pound pipelines while maintaining high reliability and performance.
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The ideal candidate
- Has 4+ years of experience shipping production-grade backend systems, with an essential background in fintech API infrastructure like payments, ledgers, or open finance.
- Demonstrates deep expertise in building multi-tenant, event-driven architectures and a high degree of autonomy to solve ambiguous problems without extensive hand-holding.
- Possesses a product-minded approach, comfortable moving across the stack when necessary and prioritizing pragmatic, reliable technology choices to solve real-world financial operation problems.
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