Lumanu - Senior Software Engineer

Remote - United States$150k - $180k1mo ago

Remote Senior NA Banking Fintech Senior Software Engineer TypeScript Node.js Documentation PostgreSQL Hasura GraphQL AWS Segment React Next.js Unit Apollo Plaid Sentry Docker Jest Doppler Playwright Honeycomb Observable

Requirements

• 5+ years building and running backend systems in production, including services you owned end to end. • Strong TypeScript and Node.js, and comfort designing relational data models in PostgreSQL. • Real experience with GraphQL APIs (Hasura or similar) and good instincts for schema design. • Hands-on AWS experience: Lambda, serverless architectures, and infrastructure as code (we use CloudFormation and the Serverless Framework). • You take security seriously. Authentication and authorization (we use Auth0 and JWTs), encryption, and careful PII handling should all be familiar ground. • You've integrated third-party APIs and thought hard about retries, idempotency, and what happens when things fail mid-payment. • Good habits around testing, observability, and CI/CD. • You write clearly and can make sensible tradeoffs without much supervision. • You've built or maintained APIs at scale. • A background in fintech, payments, or compliance (KYC, tax, banking, or money movement). • Familiarity with other parts of our stack: Hasura, Segment, Twilio, SendGrid. • Experience building for users across many countries: multi-currency, internationalization, cross-border payments. • Some of the Tools We Use • TypeScript · Node.js 20 · Next.js · React · Hasura GraphQL · PostgreSQL · AWS Lambda · Serverless Framework · CloudFormation · AWS KMS · Auth0 · Apollo/GraphQL Codegen · Plaid · Unit · Codat · Persona · TaxBit · OpenTelemetry · Sentry · Pino · Jest · Playwright · Doppler · Docker

Responsibilities

• Build and scale backend services in TypeScript on AWS Lambda, backed by PostgreSQL and Hasura GraphQL. • Own the data model and API surface: schema design, migrations, Hasura metadata, permissions, and GraphQL codegen. • Build and maintain integrations with our fintech and compliance partners. • Work with sensitive data (tax IDs, identity documents, payment details) behind encryption and strict access controls. • Implement the logic behind global payouts, W-9/W-8 collection, real-time tax validation, and 1099 generation. • Keep services observable in production with services like Honeycomb and Sentry • Write tests that earn their keep (Jest for unit and integration, Playwright for end-to-end) and help keep code review standards high. • Ship features alongside product and frontend engineers in a Next.js app, and mentor other engineers as the team grows.

Benefits

• Salary range: $150,000–$180,000, depending on experience and location. • Medical, dental, and vision insurance. • The code you ship here moves real money for real people, usually within your first few weeks. The team is small enough that you'll have a real say in architecture, product, and process. And the problems are hard in a good way: payments, compliance, encryption, and infrastructure that spans 180 countries.