Mid / Senior Backend Engineer (Contractor)

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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