Stefan Johansson
Senior Project Manager at ONE Nordic AB
Greater Malmö Metropolitan Area Sweden
Summary
🤩
Rockstar🎓
Top SchoolStefan Johansson is a Senior Project Manager with 12+ years in IT delivery and a career spanning infrastructure, datacenter migrations, and large-scale meter-reading and telecom rollouts across Sweden and Nordic clients. Originally technical, he combines hands-on engineering experience with client-facing leadership to manage complex transfers of responsibility between providers, often coordinating suppliers, hosting partners and multi-site stakeholders. He has repeatedly run PMOs and led cross-functional teams through migration, consolidation and go-live phases—managing everything from VMware lift‑and‑shift moves to telecom SIM rollouts for thousands of users. Beyond program management, Stefan contributes to OpenJDK as a HotSpot G1 GC engineer, evidencing deep systems-level knowledge in garbage collection internals that informs his infrastructure decisions. Based in Malmö, he excels at building processes that secure business buy-in and operational readiness, not just completing technical tasks. His background in consultancy and practice management gives him a rare blend of delivery discipline, commercial acumen and low-level technical credibility.
12 years of coding experience
14 years of employment as a software developer
Bachelor, Computer science (Systemvetenskap), Bachelor, Computer science (Systemvetenskap) at Lund University
English, Swedish
Github Skills (6)
javas10
openjdk10
jvm10
java10
cprogramming-language9
c-language9
Programming languages (2)
Github contributions (5)
openjdk/jdk
Mar 2020 - Mar 2025
JDK main-line development https://openjdk.org/projects/jdk
Role in this project:
Back-end Developer
Back-end DeveloperContributions:629 reviews, 51 PRs, 657 comments in 5 years
Contributions summary:Stefan primarily contributed to the G1 garbage collector within the OpenJDK project. Their work focused on refactoring and restructuring G1 full garbage collection code, improving code efficiency and maintainability. Specific changes included modifications to the G1CollectedHeap class and associated files, indicating work on core garbage collection algorithms.
openjdkjavajvmjdk
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.