Senior Java Backend Engineer

We are looking for a Senior Java Backend Engineer to join a small, autonomous engineering team working on large-scale, distributed systems.

Only candidates who already have a valid work permit/right to work in Sweden should apply.

❌ If you do not currently have a valid Swedish work permit/right to work in Sweden, please DO NOT apply.

ALL REQUIREMENTS ARE MANDATORY

Candidates are expected to meet all the key requirements and technical criteria listed below. Please review the complete job description carefully before applying.

📍 Location & Work Model

Malmö, Sweden

100% On-site

English-speaking environment

Relocation required if not already based in Malmö

Salary: 350 SEK to 800 SEK Per hour

Benefits: Pension, Insurance, Social Security Benefits.

💼 Job Details

Job Type: Contract basis (2 year)

Joining: Immediate joiners only

Work Permit: Valid work permit in Sweden is mandatory

Opportunity: Long-term contract opportunity

🔑 Key Requirements

5+ years of professional software engineering experience with strong backend expertise

Deep knowledge of Java and JVM, including: JVM memory management, Garbage Collection (GC), Concurrency, Performance tuning, Virtual threads

Strong experience building and scaling customer-facing web services

Solid understanding of distributed systems and distributed data architectures

Experience with Cassandra, Redis, Memcached, or similar technologies

Experience building REST services using Netty or similar frameworks

Hands-on experience with CI/CD, automated testing, and software delivery

Strong communication skills and ability to work independently in a fast-changing environment

⭐ Nice to Have

Cryptography/security knowledge: PKCS, KMIP, X.509, AES, KDF, CA

Exposure to ML systems/frameworks

Experience with GitHub, Maven, Docker, Kubernetes, Spinnaker

Experience with privacy-sensitive or security-critical systems

🛠️ Technology Stack

Java | Cassandra | Redis | Netty | Docker | Kubernetes | GitHub | Maven

⚠️ Important

Valid work permit in Sweden is mandatory.

Only immediate joiners will be considered.

This is a contract position.

100% on-site in Malmö, Sweden.