Senior Java Full-stack Developers at Multiply

Help us build the future of digital platforms across FinTech, telecom, and secure mission-critical systems.

Multiply Teknik & IT is growing our engineering community and expanding our capabilities in modern Java development. We work on strategically important, long-term projects with leading Swedish companies—projects that we drive, influence, and co-create together with our customers.

We are now looking for experienced Senior Java Full-stack Developers who want to contribute to advanced technical environments, shape architectural decisions, and play an important role in Multiply’s continued growth.

You will also have the opportunity to provide insights, integrations, and technical contributions to VisFlow, our internal platform for flow visualisation and operational intelligence.

As a Senior Java Full-stack Developer at Multiply, you will join a strong engineering community that collaborates across domains and industries. Your work may involve:

Building scalable financial services used by thousands of companies across Sweden—such as contributing to the next-generation solutions within Fortnox’s ecosystem.

Designing full-stack services, enabling 5G policy control, and working with high-load, high-availability systems.

Developing modern microservice architectures in environments where security, robustness, and code quality are paramount.

Regardless of which project you contribute to, you will influence technical direction, support colleagues, and work closely with product and design to create meaningful solutions.

• Build and evolve backend and full-stack solutions using Java17+, Jakarta EE, Spring, and modern JavaScript frameworks (React/TypeScript or Angular).
• Design and implement microservices, APIs, and distributed systems.
• Work in Kubernetes, container-based, and DevOps-driven environments.
• Collaborate in cross-functional teams across Sweden and globally.
• Lead technical discussions and mentor developers.
• Contribute to Multiply’s internal engineering practices and VisFlow’s technical roadmap.
• Support AI-assisted development and modern tooling (e.g., Amazon Kiro, Copilot).

We welcome candidates with strong engineering fundamentals and deep Java experience. You may have worked in telecom, FinTech, enterprise systems, or other complex environments.

• 5–10+ years of experience in advanced Java development
• Strong full-stack capabilities (Java + JavaScript/TypeScript)
• Experience with microservices, CI/CD, Docker/Kubernetes
• Solid knowledge of REST, API design, testing practices
• Comfortable mentoring and supporting other developers
• Strong communication skills and a collaborative mindset

• Experience with telecom protocols (Diameter, 5G REST)
• Kotlin, Angular, Kafka, SQL, or event-driven architectures
• Experience in high-security environments
• Swedish language fluency
• Swedish citizenship (required only for specific secure projects)

You enjoy solving complex problems, working closely with product and design, and creating solutions that have real user and business impact. You value clean architecture, modern engineering practices, and knowledge sharing. You are curious, humble, and want to grow together with a team.

• Work with a broad range of technically challenging and meaningful projects
• Become part of a senior engineering community that values craftsmanship and collaboration
• Influence architecture, technical strategy, and engineering culture
• Opportunities to work across domains: FinTech, telecom, enterprise systems, and secure platforms
• Contribute to our internal product VisFlow and shape its future capabilities
• A company built on trust, long-term relationships, and continuous learning
• A modern, transparent environment that prioritizes innovation and employee growth