SJ AB Tech Stack

Swedish rail operator scaling operations with modern cloud and DevOps infrastructure

Rail Transportation Stockholm 5,001–10,000 employees Founded 2001 Public Company

SJ operates Sweden's largest passenger rail network, moving 140,000 daily travelers across 1,200+ daily departures. The tech stack—Java, Spring Boot, Kubernetes, Azure, ArgoCD—reflects a mid-size engineering org mid-way through cloud modernization, with Docker and infrastructure-as-code (Terraform, Bicep) now standard. Active hiring across engineering and ops (18 of 22 open roles) signals sustained investment in platform reliability and developer tooling, not cost-cutting.

Tech Stack 20 technologies

Core StackJava Docker Kubernetes JUnit Kotlin ArgoCD Terraform GitHub Grafana Go TypeScript Spring Boot Cucumber Android Azure Backstage Bicep Maximo RVM

What SJ AB Is Building

◆Challenges

Ensuring 24/7 uptime for operational tools
Meeting reduction targets
Systematic handling of sustainability aspects across value chain
Maintaining safe and punctual train service
Ensuring compliance with supplier requirements
Fault analysis
Delivering trains on time
Ensuring smooth material supply
Reducing logistics cost
Strengthening brand trust

▲Active Projects

Operational tools on board
Developer platform
Self-service services
Platform modernization
Transition plan to reach reduction targets
Sustainability data reporting
Internal sustainability training
Sveriges första ofp-robot
Sweden's first ofp robot
Sjs new regional train zeta

Hiring Activity

Steady20 roles · 8 in 30d

Department

Engineering

Ops

Logistics

Marketing

Sustainability

Seniority

Mid

Junior

Manager

Senior

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About SJ AB

SJ is a publicly traded Swedish train operator serving long-distance and regional rail across Sweden and the Scandinavian capitals (Stockholm, Copenhagen, Oslo). The company operates 284 stations with around 4,600 employees and SEK 7.9 billion in annual sales. Service portfolio spans high-speed and night trains, regional routes, and tendered commuter services. All Swedish trains carry the Good Environmental Choice (Bra Miljöval) label; sustainability targets and compliance reporting are core operational concerns, reflected in active projects on sustainability data and reduction-target planning.

HeadquartersStockholm

Company Size5,001–10,000 employees

Founded2001

Hiring MarketsSweden

Frequently Asked Questions

What tech stack does SJ use?

Java, Spring Boot, Docker, Kubernetes, TypeScript, Kotlin, and Azure. DevOps tooling includes ArgoCD, Terraform, GitHub, and Grafana for monitoring. Maximo supports asset and maintenance operations.

What is SJ working on?

Key projects include a developer platform, platform modernization, operational tools onboard trains, self-service customer services, sustainability data reporting, and new regional train (Zeta) rollout.