Join to apply for the Mid/Senior Backend Engineer (Contractor) role at Braintrust.
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
Industries: Technology, Information and Internet
This job posting is active and available.
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