Senior Fullstack Engineer – Payments Platform & Migration Lead

Sytac BV; Amsterdam; Hybrid; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Unlimited Growth Days

Private laptop

Tech budget

Growth budget for training

Pension contribution

Annual company events

Job summary

At Sytac, we build high-performing engineering teams for leading organizations in the Netherlands, including a major financial services client in Amsterdam. We are seeking a Senior Full Stack Software Engineer to join the Payments team, driving secure, scalable card services in a modern, containerized environment.

You will work across the stack (Java, Spring Boot, frontend with Lit/Web Components and NPM) on OpenShift, Kubernetes, Docker, and related tooling, taking ownership from design to

Qualifications

• 6+ years of professional software development experience.
• Experience leading a software feature end-to-end, from design through deployment.
• Experience with test automation (e.g. WireMock), continuous delivery, and modern deployment pipelines.
• Strong reasoning and architectural thinking, with the ability to quickly get up to speed on unfamiliar technical concepts.
• Great communication skills — comfortable acting as a technical sparring partner for business stakeholders as well as engineers.
• Fluency in English, spoken and written.

Responsibilities

• Design, build, and enhance applications supporting the full lifecycle of debit and credit card services — from issuance to blocking, replacing cards, adjusting limits, and PIN requests.
• Contribute to a large-scale migration of millions of legacy cards onto a new platform, consolidating microservices and frontends into a single, reusable, product-agnostic solution built for reuse across countries and currencies.
• Help shape new credit card offerings, including subscription-based models, as part of a broader push to modernize the product portfolio.
• Work across the stack — with a focus on backend — using Java, Spring Boot, Maven, Azure DevOps, Kafka, Cassandra, and Oracle, alongside Lit HTML/Web Components and NPM on the frontend.
• Take ownership end-to-end: refine, code, test, and deploy your own work to immutable containers running on OpenShift, using Helm, Kubernetes, and Docker (Compose).
• Act as a technical lead and mentor, while also learning from colleagues across a diverse, multidisciplinary team.
• Share knowledge with the wider engineering organization through documentation, presentations, and workshops, helping shape new standards for how the team works.

Skills

Java

Spring Boot

Architecture thinking

Team leadership

Test automation

English fluency

Tools

OpenShift

Kubernetes

Docker

Maven

Azure DevOps

Kafka

Cassandra

Oracle

Lit HTML/Web Components

NPM

Helm

Job description

At Sytac, we build high-performing engineering teams for leading organizations in the Netherlands, including a major financial services client in Amsterdam. We are seeking a Senior Full Stack Software Engineer to join the Payments team, driving secure, scalable card services in a modern, containerized environment.

You will work across the stack (Java, Spring Boot, frontend with Lit/Web Components and NPM) on OpenShift, Kubernetes, Docker, and related tooling, taking ownership from design to