Full Stack Developer

MerkleRotterdamHybridFull-time29 Sept 2026

Merkle is seeking a hands-on Full-Stack Developer to build and scale internal tools and AI-powered applications. The role involves owning the application layer end-to-end, from backend and infrastructure to frontend, with a focus on modern JavaScript/TypeScript stacks, Docker, and multi-tenant patterns. This is a full-time, on-site position in Rotterdam, Netherlands.

What you'll do

Own and maintain the full application stack across internal tools: backend, database, auth, and frontend
Design and implement authentication and access control (e.g., SSO with SAML or Okta, multi-tenant data isolation, role-based access)
Write and maintain database schemas, migrations, and access policies (e.g., PostgreSQL with RLS and RPC functions)
Build and manage serverless backend functions (e.g., for application logic and API integrations)
Set up and maintain CI/CD pipelines and manage deployments across environments (e.g., DEV, UAT, PROD)
Build and maintain modern frontends (e.g., React, Vite, TypeScript)
Debug and resolve issues across the stack (e.g., build errors, networking, misconfigured services, 5xx errors)
Collaborate with the AI/LLM side of the team to integrate model outputs cleanly into the application
Take ownership from idea → build → run → improve

What you need

Must-have

JavaScriptTypeScriptReactNext.jsNode.jsDockerPostgreSQLCI/CD

Nice-to-have

SupabaseFirebaseDenoBunOpenAIAnthropicSSE streamingReal-time data patterns

Soft skills

Problem-solvingOwnership mindsetCollaboration

Full Stack DeveloperBusiness ConsultingAIReactTypeScriptNode.jsDockerPostgreSQLRotterdamMerkle

/What you'll do

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Must-have

Nice-to-have

Soft skills

What you'll do

What you need