About Scalepex

Scalepex is a nearshore partner that empowers businesses to scale efficiently and effectively through exceptional services. With a strong focus on customer success, innovation, and cultural alignment, we support companies in building high-performing teams across industries.

At Scalepex, we believe in fostering an environment where our people can thrive, grow their careers, and make a real impact.

Job Summary

We are looking for a Senior Full Stack Engineer to join a fast-growing B2B SaaS startup building a modern multi-tenant platform that automates financial and operational workflows.

This is a highly autonomous role where you'll own core platform development, backend architecture, database design, integrations, and platform scalability. You'll work in an AI-native engineering environment, leveraging modern AI coding tools to deliver high-quality software quickly.

Requirements

Responsibilities

• Design, develop, and maintain scalable backend services using Node.js and TypeScript.
• Own PostgreSQL database architecture, schema design, migrations, and performance optimization.
• Build and maintain REST APIs, OAuth integrations, and third-party platform connections.
• Develop and improve multi-tenant SaaS infrastructure.
• Create reliable background jobs, schedulers, and asynchronous workflows.
• Write automated unit and end-to-end tests.
• Audit existing systems and propose scalable technical solutions.
• Improve application reliability, performance, and security.
• Collaborate with the team during US business hours.
• Leverage AI-assisted development tools to increase development speed while maintaining high quality.

Must Have

• 5+ years of Full Stack or Backend software development experience.
• Expert knowledge of TypeScript and JavaScript.
• Strong experience with Node.js.
• Experience with Next.js (App Router).
• Advanced PostgreSQL knowledge:
• Schema design
• Raw SQL
• Query optimization
• Database migrations
• Experience using Prisma ORM (or similar ORM).
• Experience building scalable SaaS applications.
• Multi-tenant architecture experience.
• Experience building REST APIs.
• OAuth 2.0 and Webhooks.
• Playwright or Puppeteer.
• Background job schedulers (Cron, BullMQ, pg-boss or similar).
• Automated testing experience.
• Git and Pull Request workflows.
• Excellent written English.
• Availability during US business hours.

Nice to Have

• Experience working with financial systems.
• React 19.
• Python.
• Linux, Nginx, PM2.
• CI/CD pipelines.
• PgBouncer.
• Experience with Model Context Protocol (MCP).
• Experience with Cursor, Claude Code, Copilot, or similar AI development tools.

Benefits

• Contractor scheme
• 100% Remote