Fullstack Developer (Backend PHP Symfony & AI Stack focus) Medior / Senior

This role is built around the belief that AI is not just a feature, but a fundamental shift in how we develop products. You actively contribute to this shift by integrating AI into both the product and the development process itself.

As a Fullstack Developer, you ensure the stability of the PHP/Symfony environment while playing a key role in shaping and expanding our AI stack. You help reduce technical debt, improve system reliability, and elevate the team’s overall AI capabilities.

Key Responsibilities

• AI-First Engineering

Actively experiment with and integrate the latest AI technologies into both the product and internal workflows

• Backend & API Development

Design and build complex business logic and high-performance APIs using Symfony and FastAPI

• AI Stack Integration

Contribute to and maintain AI-driven components such as data pipelines, embeddings, and retrieval systems

• Database & Architecture Ownership

Manage, optimize, and scale the RDS SQL architecture while ensuring stability and security across systems

• Full-Cycle Delivery

Independently deliver backend features end-to-end, including minor React adjustments when needed to ship complete solutions

• Knowledge Sharing & Team Enablement

Actively share insights and improve the team’s understanding and usage of AI tools and best practices

• Epic Ownership (when applicable)

Take the lead on larger initiatives (Epics) by maintaining overview, ensuring clear communication, preparing tickets, and driving progress through strong planning and coordination

Required Experience / Skills

• AI Mindset (Core Requirement)

You fully embrace the shift towards AI-driven development and actively look for ways to work smarter and build better using AI

• Backend Expertise

At least 5 years of experience with PHP and the Symfony framework

• Python & FastAPI

Proven experience with, or strong ability to quickly master, Python with a focus on building services using FastAPI

• Database Design

Solid experience with SQL and database optimization (preferably RDS)

• Pragmatic Fullstack Ability

Comfortable working across the stack, including reading and adjusting React code when needed to complete features

• Strong focus on clean, maintainable, and well-structured code

Preferred Qualifications

• AI Frameworks & Tooling

Experience with frameworks such as LangChain

• Data & AI Infrastructure

Knowledge of vector databases and embeddings

• Architecture & Engineering Practices

Experience with Domain-Driven Design or asynchronous processing

• Epic Management & Leadership

Ability to lead larger initiatives, including maintaining overview, ticket preparation, brainstorming, and time management

Your new home base

You’ll work from our beautiful office at Kop van Zuid in Rotterdam, with the flexibility to work remotely part of the week. You’ll join an international and friendly development team with strong processes, a stable OTAP environment and a mature codebase.

What we offer

• Competitive salary based on your seniority.
• Unlimited paid time off.
• Flexible working hours and hybrid work options.
• Budget for tools, learning, courses or tech events.
• A collaborative international team that loves building, improving and shipping.

Our hiring process

Our process consists of two conversations, designed to give both sides clarity and confidence. During both sessions, you will speak directly with your future day-to-day colleagues from Product and the Development team.

• Culture & personal fit

In the first conversation, we explore whether there is a natural match in personality, communication style and ways of working. You’ll learn more about our vision, culture and team – and we’re curious to hear what motivates you.

• Technical depth & problem-solving

The second conversation focuses on your technical experience, reasoning and approach. No trick questions – just an honest, in-depth discussion about architecture, problem-solving, engineering challenges and how you build scalable systems.

For questions or more information, feel free to contact Zeno via WhatsApp or email at product@mrwork.nl

We look forward to hearing from you – and who knows, you might become the newest addition to our MrWork team!

Respond directly via the WhatsApp button or ask Zeno a question.

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