Senior Software Engineer – Workflow Engine Lead

Remote | €300/day | Amsterdam or Remote (EU only)

We’re looking for a Senior Software Engineer to take full ownership of the core Workflow Engine that powers a high-scale marketing automation platform. This is a key technical leadership role where you’ll design and optimise event-driven systems that process millions of user events in real time.

What you’ll do

• Lead the architecture, development, and optimisation of a mission-critical workflow engine
• Build and enhance event-driven systems with Kafka, Spring Boot, and distributed caching
• Enable multi-channel messaging across push, email, SMS, and in-app journeys
• Partner with product teams to deliver new workflow features with real business impact
• Ensure performance, scalability, and reliability at scale (sub-100ms response times, 99.9% uptime)

What you bring

• Strong expertise in Java (Spring Boot) and event-driven architecture (Kafka)
• Experience with distributed systems, state machines, and workflow orchestration
• Knowledge of PostgreSQL, MongoDB, and caching frameworks (Hazelcast, Caffeine)
• Background in large-scale, high-performance platforms (millions of users/events)
• Bonus: Experience in MarTech, AdTech, or customer engagement platforms

Why join

• Remote-first flexibility
• Ownership of a critical system driving user engagement
• Technical leadership in a cutting-edge environment

How to Apply

Send your CV and a short note on your relevant experience to me or apply directly and I will give you a call.

Interview Process

1. Intro Call – Get to know each other, discuss your background and expectations.
2. Case Study – Work on a practical project designed to show your approach to problem-solving.
3. Case Review – Present your solution and thought process in a technical discussion.
4. Final Interview – Meet stakeholders and align on role expectations.