Join the founding team at Dolfin to build the core infrastructure for AI-native financial operations. You will design and ship event-driven, multi-tenant systems that power autonomous agents for real-world SMBs. This is a deep, hands-on build role focused on reliability and correctness in a high-stakes fintech environment where performance and auditability are non-negotiable.
Senior Backend Engineer at Dolfin
Dolfin is redefining financial operations by building the first agentic API for SMB platforms. Backed by Balderton and already serving unicorn clients, they are looking for a Senior Backend Engineer to design and own the core infrastructure that powers autonomous financial agents. This isn’t about building copilots; it’s about shipping production-ready AI that handles real money movement. You’ll join an early-stage team in London, taking full ownership of event-driven, multi-tenant systems. If you have 4+ years of experience in fintech API infrastructure and want to shape the future of AI-native finance, this is your chance to lead a category-defining build from day one.
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Location
London, United Kingdom
Compensation
£65k-£95k + Equity
Company
Dolfin
Role overview
Fintech SaaS1-10 employees
Dolfin builds agentic financial operations infrastructure for SMB platforms. Think Ramp intelligence, but white-label and embedded inside any B2B platform. Instead of another standalone finance tool, Dolfin provides native AI agents that operate autonomously inside the platforms SMBs already use.
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.
Who this is a fit for
- 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.
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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