Full-Stack Engineer: AI Tools & Internal Platform

Merkle Inc.; Rotterdam; Hybrid; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Hybrid work model

Well-being days

Social impact days

Learning and development opportunities

2–3 days in the office

Job summary

Merkle is seeking a hands-on Full-Stack Developer to build and scale internal tools and AI-powered applications, owning the application layer end-to-end—from backend to frontend—covering backend logic, infrastructure, authentication, deployments, and day-to-day stability.

You will own the full stack, design authentication with SSO, manage database schemas, build serverless functions, and maintain CI/CD pipelines.

Qualifications

• 3+ years in software engineering (full-stack, AI, or platform development).
• Experience with Docker and self-hosted infrastructure, not just managed cloud services.
• Knowledge and experience with multi-tenant application patterns.
• Solid problem-solving skills and strong ownership mindset.

Responsibilities

• 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).
• Write and maintain database schemas, migrations, and access policies (e.g., PostgreSQL with RLS).
• Build and manage serverless backend functions and API integrations.
• Set up and maintain CI/CD pipelines and deployments across DEV/UAT/PROD.
• Build and maintain modern frontends (e.g., React, TypeScript).
• Debug and resolve issues across the stack (build, networking, 5xx errors).
• Collaborate with AI/LLM team to integrate model outputs into the app.

Skills

Problem solving

Ownership mindset

Collaborative work

Strong troubleshooting

Tools

Docker

Self-hosted infra

Multi-tenant patterns

SAML/SSO

Job description

Merkle is seeking a hands-on Full-Stack Developer to build and scale internal tools and AI-powered applications, owning the application layer end-to-end—from backend to frontend—covering backend logic, infrastructure, authentication, deployments, and day-to-day stability.

You will own the full stack, design authentication with SSO, manage database schemas, build serverless functions, and maintain CI/CD pipelines.