Sven Woltmann
Java Scalability And Performance Specialist Freelancer Author Speaker at HappyCoders.eu
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolSven Woltmann is a Java scalability and performance specialist, entrepreneur and author with over two decades of engineering leadership and 11 years focused on modern Java systems. He founded HappyCoders.eu to translate deep Java expertise into practical training, articles and talks that help teams modernize, reduce cloud costs and ship faster. Sven has led high-impact migrations and optimizations—delivering up to 1,000x query speedups when moving terabytes from DynamoDB to PostgreSQL and 50x load improvements in large-scale backends—while pioneering virtual-thread and async-first designs with Java 21 and Mutiny. His background spans founding multiple startups, building global platforms (AndroidPIT/NextPit) and guiding enterprises like IONOS and ICE through microservices, CI/CD and zero-downtime deployments. Known for bridging theory and practice, he combines hands-on coding across hundreds of repositories with developer coaching and conference speaking. Based in Berlin, he pairs entrepreneurial grit with a practical obsession for measurable performance gains.
11 years of coding experience
22 years of employment as a software developer
Diplom-Informatiker Computer Science, Diplom-Informatiker Computer Science at Technische Universität Ilmenau
English, French, German, Spanish
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (80)
dijkstra10
avl-tree10
heapsort10
counting-sort10
red-black-tree10
datastructures-algorithms10
bubble-sort10
binary-tree10
reactive10
binary-search10
palette10
astar10
logstash10
binary-search-tree10
floyd-warshall10
Programming languages (3)
Github contributions (5)
SvenWoltmann/pathfinding
Oct 2020 - Jul 2022
Source code for the HappyCoders.eu articles on pathfinding and shortest path algorithms (Dijkstra, A*, Bellman-Ford, Floyd-Warshall).
Contributions:69 commits, 83 PRs, 117 pushes in 1 year 8 months
bellman-fordastar-algorithmforddijkstra-algorithmdijkstra
SvenWoltmann/hexagonal-architecture-java
May 2023 - Nov 2024
This repository contains a sample Java REST application implemented according to hexagonal architecture.
Contributions:7 PRs, 130 pushes, 14 branches in 1 year 5 months
hexagonal-architecturehexagonal-architecturesjavaports-and-adapters
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