Senior Full Stack Engineer

Senior Full Stack Engineer – React / TypeScript / Node.js / AWS We're looking for a Senior Full Stack Engineer who enjoys working on complex existing systems — stabilising codebases, improving reliability and making products easier to scale and maintain. At Vertex, we work with ambitious companies on challenging technology problems. This opportunity is with a SaaS product supporting. But here's the challenge: ⚠️ The existing codebase needs stabilising. ⚠️ Too much knowledge sits with individual developers. ⚠️ Releases and quality need to improve. ⚠️ The architecture needs to become more modular and scalable. So, we're looking for engineers who enjoy getting their hands dirty. People who can look at a complex codebase and ask: What is breaking? Why is it breaking? And how do we build it better? 🔧 Tech Stack React & TypeScriptNode.js & TypeScriptPostgreSQL & Drizzle ORMAWS Lambda, SQS, API Gateway & CognitoTerraformReact NativeMonorepo & shared type-safe contracts 🎯 What we're looking for Strong commercial experience with React + TypeScriptStrong Node.js backend/API development experienceGood experience with PostgreSQL and database migrationsHands-on AWS experience, particularly Lambda and SQSExperience with FIFO, DLQ, retries and idempotencyExperience working with monorepos and shared typesStrong testing experience with Vitest, Playwright and integration testingExperience with Terraform / Infrastructure as CodeStrong understanding of scalable, modular architectureComfortable working with and improving an existing codebaseSenior-level ownership and problem-solving mindset At Vertex, we are a technology consultancy, and this is the kind of engagement where you can have a real impact on the product and its technical future. If you're someone who enjoys ownership, problem-solving and building scalable systems, I'd love to connect. Interested? Send me a message or apply through the job advert below.