Michael Lehto
Senior Development Engineer at Banking Circle
Copenhagen, Capital Region of Denmark
Summary
👤
Senior🎓
Top SchoolMichael Lehto is a senior development engineer with 13 years of experience building scalable, event-driven .NET systems and leading teams through complex architecture transitions. He has driven major migrations from monoliths to microservices, introduced event sourcing and Kafka-based real-time integrations, and championed CI/CD, GitHub Flow and Kanban to accelerate delivery. As a hands-on tech lead at Visma Dinero he combined architectural leadership with direct ownership of performance and database optimization, and now continues at Banking Circle. He contributes to open-source .NET projects such as Marten, where his backend and QA work helped resolve concurrency and event-stream issues in a PostgreSQL-backed event store. Calm under pressure and quick to take responsibility, he blends engineering discipline with a focus on collaboration with domain experts to turn complex requirements into reliable production systems. Based in Copenhagen, he favors pragmatic solutions that enable fast feature delivery without sacrificing scalability or reliability.
13 years of coding experience
19 years of employment as a software developer
Lyngby HTXb.sc., Information and communication technology, b.sc., Information and communication technology at Copenhagen University College of Engineering
English, Danish
Stackoverflow
257reputation
6kreached
2answers
6questions
Github Skills (28)
postgresql10
testing10
net10
dotnet10
xunit10
event-sourcing10
asp-net10
document-database10
dotnet-core10
csharp10
marten10
async9
debug9
asynchronous9
debugging9
Programming languages (4)
Github contributions (5)
JasperFx/marten
Oct 2021 - Jan 2023
.NET Transactional Document DB and Event Store on PostgreSQL
Role in this project:
Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:1 review, 19 commits, 8 PRs in 1 year 3 months
Contributions summary:Michael primarily contributed to the backend logic and testing of the Marten .NET transactional document database. Their work involved adding and modifying unit tests to identify and resolve bugs related to event stream handling and high water mark detection within the event store. They also refactored code to improve logging and ensure proper behavior of the asynchronous daemon, along with addressing concurrency issues.
dotnetmartenevent-sourcingtransactionalsql
Leh2/marten
Dec 2021 - Sep 2024
Postgresql as a Document Database and Event Store for .Net Applications
Contributions:18 pushes, 11 branches in 2 years 10 months
sqlserversql-serversqldatabasepostgres
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