Software Engineer

Backend Developer (Full-Stack) - Spark Labs (Remote)Spark Labs is a fully remote software and AI integration company building custom solutions for B2B clients. Customer satisfaction is a top priority at Spark Labs, and every project is measured by how well it serves the client. We’re looking for a self-sufficient, API-focused developer who can own backend systems end to end, has experience handling sensitive healthcare data responsibly, and works directly with customers to turn their needs into reliable software.What you’ll doDesign, build, and maintain secure, well-documented APIs and backend servicesBuild and support systems that handle PHI in compliance with HIPAADeploy and operate services on AWSBuild and integrate MCP servers and adapters for AI-enabled workflowsContribute to frontend work as neededWork directly with clients to gather requirements, explain technical tradeoffs in plain language, and keep projects on trackOwn your work from first conversation through deployment and support, with minimal hand-holdingOur stackCore: TypeScript, Bun workspaces/runtime, OXC API: Elysia, OpenAPI, CORS, server timing, OpenTelemetry, MCP adapterWeb: React, TanStack Router/Query/Form/Table/Virtual/Charts, D3, typed API client generated with Hey API/OpenAPIIdentity and policy: Better Auth (organizations, SSO, SCIM, passkeys, Stripe plugin); ZenStack policy tooling plus PostgreSQL RLSData: PostgreSQL, Kysely with Bun SQL driver, SQL migrations; planned evaluation of pgAudit, pgvector, and conditional pgactive replicationRequirementsStrong backend and API development experience with TypeScript and PostgreSQLHands-on experience working with PHI and building HIPAA-compliant systemsAWS experience deploying and running production servicesMCP experience (building servers, adapters, or integrations)Excellent communication skills and a genuine commitment to client satisfactionSelf-directed: you manage your own time, ask good questions, and deliver without close supervisionNice to haveFull-stack experience, especially React and TanStackExperience with Bun, Elysia, Better Auth, or ZenStackFamiliarity with OpenTelemetry, PostgreSQL RLS, or multi-tenant authorizationWhy Spark Labs Fully remote, smaller team, real ownership, modern tooling, and direct impact on client outcomes.This is a contractor position. Opportunity to turn into a direct hire in the future.