Mid/Senior Backend Engineer (Contractor)

Join to apply for the Mid/Senior Backend Engineer (Contractor) role at Braintrust . 2 weeks ago Be among the first 25 applicants. Get AI-powered advice on this job and more exclusive features. About the Project Sellhub is a fast-growing digital platform for creating online stores for digital assets and goods. We are building a robust, modular SaaS platform for e-commerce, community tools, and digital payments. Our monorepo includes event-driven services, REST and tRPC APIs, advanced analytics, payment integrations (Stripe, PayPal, Crypto), and rich user dashboards. We ship fast, value clean architecture, and work in a modern Typescript/Node.js environment. Stack Highlights: Node.js (Typescript, Express, Next.js) PostgreSQL (via Drizzle ORM, Knex) REST, tRPC, and event-driven microservices Payment integrations: Stripe, PayPal, Crypto Cloudflare, Docker, Github Actions Modular monorepo with strict code guidelines Your Responsibilities Lead development and refactoring of backend APIs (REST/tRPC) and core business logic Architect and optimize database schemas, queries, and migrations (PostgreSQL) Integrate and manage third-party payment providers (Stripe, PayPal, Crypto, etc) Drive test coverage and reliability for mission-critical services Contribute to DevOps and CI/CD improvements (Github Actions, Docker, Cloudflare Workers) Document your decisions and leave the codebase better than you found it What We’re Looking For 5 years experience building backend systems (Node.js/Typescript strongly preferred) Solid grasp of PostgreSQL, schema design, and query optimization Deep experience with API development (REST/tRPC) Payment integrations with Stripe/PayPal (bonus for Crypto or MoR experience) Familiar with Docker, Github Actions, and modern cloud infra Track record of leading/mentoring engineers in a collaborative remote environment Clear communicator, async-friendly, comfortable in a fast-paced team Nice-to-haves Experience with event-driven or microservices architecture Familiarity with Cloudflare Workers or edge computing Prior work on SaaS/marketplace, fintech, or digital product platforms Open-source contributions or public tech blog Seniority level Mid-Senior level Employment type Full-time Job function Engineering and Information Technology This job posting appears active and relevant. No indicators of expiration are present. J-18808-Ljbffr

Location: São Paulo, São Paulo, BR

Posted Date: 9/17/2025