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About ScalepexScalepex 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 SummaryWe 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.ResponsibilitiesDesign, 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 Have5+ 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 designRaw SQLQuery optimizationDatabase migrationsExperience 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 HaveExperience 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.BenefitsContractor scheme100% Remote
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