Senior Platform Engineer, Banking

What You'll Do

Design, build, and maintain foundational banking services and APIs consumed by multiple product teams across AngelList

Own core platform primitives: accounts, transactions, ledger entries, and money movement workflows

Build reliable integrations with banking partners and payment networks (ACH, wires, and related rails)

Define and enforce service contracts, data models, and interface boundaries that enable other teams to build with confidence

Improve the reliability, observability, and performance of banking infrastructure at scale

Partner with compliance and risk teams to ensure systems meet regulatory requirements

Contribute to technical direction and architectural decisions that shape how AngelList handles money

Mentor engineers across the organization who build on top of your team's platform

What We're Looking For

6+ years building backend or full-stack web applications, with meaningful time spent on platform, infrastructure, or foundational systems

Deep experience designing APIs, services, and abstractions intended for consumption by other engineering teams — you understand what makes a good platform boundary

Background in financial systems, payments, ledgers, banking integrations, or similar — you've worked in domains where correctness and auditability are non-negotiable

Track record of building systems where "close enough" isn't good enough; audit-ready outputs, not best-effort calculations

Ability to model complex business domains in relational databases with precision, especially in the face of ambiguity and evolving requirements

Experience owning foundational components that other teams depend on — you think about contracts, versioning, reliability, and developer experience

Startup experience or founder mindset — you've built something from scratch, or you carry that entrepreneurial energy into how you work

Nice to Have

Experience with double-entry accounting systems or general ledger design

Background in highly regulated industries or fintech infrastructure

Familiarity with event-driven architectures and distributed systems patterns

Experience building developer-facing tooling, SDKs, or internal platforms