Full Stack Developer

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

We’re looking for a hands‑on Full-Stack Developer to build and scale the internal tools and AI-powered applications that support Merkle’s delivery. You’ll own the application layer end-to-end - from the backend up through the frontend - covering backend logic, infrastructure, authentication, deployments, and day-to-day stability.

What You’ll Do

• Own and maintain the full application stack across our 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

What You Bring

• 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

Strong advantage:

• Familiarity with backend-as-a-service platforms (e.g., Supabase, Firebase) for auth, database, storage, and serverless functions
• Exposure to alternative JS/TS runtimes (e.g., Deno, Bun)

Nice to Have

• Hands‑on experience with LLM APIs (e.g., OpenAI, Anthropic)
• Familiarity with SSE streaming or real‑time data patterns
• Familiarity with MarTech platforms (e.g., Adobe, Salesforce, CDPs)
• Experience with authentication systems (e.g., OAuth2, SAML, SSO)

Why This Role

• Buildproducts, not projects
• Direct impact on how Merkle delivers at scale
• Work at the intersection ofAI, engineering, and platform thinking
• High ownership and room to shape solutions

What We Offer

• A dynamic, international work environment with colleagues from around the globe.
• A challenging position at a successful company in a growing market.
• A fun and inclusive culture-thinkfoosball, table tennis, themed events, and team parties.
• 3 extra days off (yes, at Merkle we take your well-being very seriously) - in addition to 25 annual vacation days, there are 3 Well-being Days.
• 2 Social Impact Days - you can volunteer for a charity of your choice.
• Extensive learning and development opportunities, including a wide range of personal and online training.
• A hybrid work model, with 2-3 days in the office and the rest working from home.
• A competitive salary and excellent secondary benefits.

Company Description

Merkle, a dentsu company, powers the experience economy. For over 35 years, Merkle has placed people at the heart of its digital business transformation approach. As the only integrated experience consultancy with a heritage in data science and business performance, Merkle delivers holistic, end-to-end experiences that drive growth, engagement, and loyalty. Recognized as a "Leader" by top industry analysts in categories such as digital transformation, commerce, experience design, engineering, technology integration, digital marketing, data science, CRM, loyalty, and customer data management, Merkle operates in 30+ countries with over 16,000 employees. In the Netherlands, more than 150 Merkle employees work with clients like ASML, Albert Heijn, HEMA, Carglass, and Signify. Merkle Netherlands is a strategic partner of Google, Adobe, Salesforce, and Selligent. For more information, visit www.merkle.com.

Diversity and Inclusion

At dentsu we believe in the power of diversity. Wewelcome all applications regardless of age, disability, gender reassignment, marital or civil partner status, pregnancy or maternity, race, color, nationality, ethnic or national origin, religion or belief, sex, or sexual orientation.