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. Please feel free to share this opportunity with someone in your network who may be a strong fit.