Jesper Hammarbäck
Principal Software Engineer at DreamJar AB
Stockholm, Sweden
Summary
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SeniorJesper Hammarbäck is a Principal Software Engineer with 21 years of experience, currently shaping cloud-native architecture and delivery at Resurs while also running his consultancy DreamJar AB. He brings deep expertise in designing transaction-intensive, web-scale systems across domains from finance and payments to gaming and health-tech, and has been building containerized microservices since 2013 and serverless systems on AWS since 2020. A pragmatic architect and hands-on developer, he favors CQRS, event sourcing and document/graph databases to turn complex business requirements into maintainable solutions. Jesper cares about software craftsmanship, agile practices and DevOps culture, and prefers spending time on code rather than managing servers—often advocating for Lambda-first microservices. He is an active back-end contributor to DDD sample projects, demonstrating a focus on testable, well-refactored code and pragmatic domain-driven design. Based in Stockholm, he blends entrepreneurial experience from his own SaaS venture with senior technical leadership across large-scale and embedded systems.
21 years of coding experience
Stackoverflow
763reputation
295kreached
9answers
3questions
Github Skills (19)
web-application10
java10
javas10
webapp10
spring-boot10
web-development10
jsp9
transaction9
unit-testing9
jspx9
actor6
xml6
domain-driven-design6
dao6
spring6
Programming languages (7)
Github contributions (5)
citerus/dddsample-core
Dec 2007 - Sep 2008
This is the new home of the original DDD Sample app (previously hosted at sf.net)..
Role in this project:
Back-end Developer
Back-end DeveloperContributions:17 commits in 9 months
Contributions summary:Jesper primarily contributed to the back-end of the DDD Sample application, focusing on web application components and service logic. They implemented features like redirecting the index page, added a form for user input, and refactored code for better readability. The user also worked on extracting DTO assembling code and added unit tests for newly created DTO assembler classes, demonstrating an emphasis on code quality and maintainability within the application.
hosteddddddd-samplecqrs
serialized-io/samples-java
Sep 2017 - Feb 2023
Java samples for Serialized
Contributions:108 commits, 9 PRs, 60 pushes in 5 years 5 months
javajsonserialization
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