Full Stack Developer

Merkle Italia; Rotterdam; On-site; EUR 60,000 - 95,000; Full time

Benefits offered by this job

Hybrid work model

Well‑being/spa days

Social Impact Days

Learning & Development

Job summary

Merkle is seeking a hands‑on Full‑Stack Developer to own the internal tools and AI‑driven applications end‑to‑end—from backend logic to frontend interfaces. You’ll design secure authentication, multi‑tenant data access, and scalable serverless functions while collaborating with the AI/LLM team to integrate model outputs.

The role offers a hybrid work model and exposure to a global engineering environment. You’ll work across PostgreSQL schemas, SSO integrations, and modern frontend stacks (React,

Qualifications

• 3+ years in software engineering (full‑stack, AI, or platform development)
• Experience with modern JavaScript/TypeScript stacks (React, Next.js, Node.js)
• Experience with Docker and self‑hosted infrastructure
• Knowledge of multi‑tenant application patterns
• Familiarity with backend‑as‑a‑service platforms (Supabase, Firebase) for auth, database, storage, and serverless functions
• Exposure to alternative JS/TS runtimes (Deno, Bun)

Responsibilities

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

Skills

JavaScript/TypeScript

React

Next.js

Node.js

Docker

Multi-tenant

Auth/SSO

Supabase

Firebase

Deno/Bun

Tools

Supabase

Firebase

Job description

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
• Take ownership from idea → build → run → improve

What You Bring

• 3+ years in software engineering (full‑stack, AI, or platform development)
• Experience with modern JavaScript/TypeScript stacks (React, Next.js, Node.js), frontend and backend
• 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

• Build products, not projects
• Direct impact on how Merkle delivers at scale
• Work at the intersection of AI, 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‑think foosball, 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 Heij, 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. We welcome 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.

Location

Rotterdam Brand: Merkle Time Type: Full time Contract Type: Fixed Term Contract (Fixed Term)

About dentsu

About dentsu For over 120 years, innovation is a core tenet of our offering – exploring new ways to reach, engage and nurture relationships with audiences. Together we drive a multiplier effect for clients at a global scale, through the development of Integrated Growth Solutions that are underpinned by our promise to clients: innovating to impact. Be a force for good. Sustainability is a vital part of our business and an important area of focus for our clients. We’re leading the way – helping to build a more sustainable planet. Dream loud. In this moment of transformation, we need our people to be fearless, embracing change and ambiguity, driven by the love for their work and excitement for the future. Team without limits. We create opportunities for connection and collaboration between our colleagues and clients, building a sense of belonging and having some fun along the way. Find out more about us Who we are Our Social Impact Our work