Sergiu Ciumac
CEO And Co-founder at visely.io
Chișinău, Moldova
Summary
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SeniorSergiu Ciumac is a founder and CEO with 14 years of hands‑on software engineering experience, currently leading visely.io and emysound.com from Chișinău, Moldova. He builds production ML and recommendation systems at the intersection of streaming, search and NLP, using technologies like Spark, Kafka, Cassandra, Solr and Scala/Java while still shipping core code himself. An open-source maintainer of a .NET audio fingerprinting library, he brings deep expertise in backend systems, database integration and robust testing—work that powers fast audio/video identification in Emysound. Sergiu combines startup generalist rigor with systems-level engineering, having moved from telecom and enterprise roles into founding products that solve real-time search and retrieval problems. He’s driven by information retrieval research and an interest in exploring alternative programming paradigms beyond the JVM.
14 years of coding experience
6 years of employment as a software developer
English, Romanian, Russian, Ukrainian
Stackoverflow
21reputation
0reached
1answer
0questions
Github Skills (15)
net10
asp-net10
dotnet10
csharp10
back-end-development10
dotnet-core10
object-oriented-programming9
test-integration8
unit-testing8
integration-testing8
testing8
test-unit8
audio6
pattern-recognition6
audio-fingerprinting6
Programming languages (3)
Github contributions (5)
AddictedCS/soundfingerprinting
Nov 2011 - Jan 2023
Open source audio fingerprinting in .NET. An efficient algorithm for acoustic fingerprinting written purely in C#.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 releases, 1898 commits, 25 PRs in 11 years 4 months
Contributions summary:Sergiu's commits primarily focused on refactoring the `ModelService` interface to enhance its robustness and abstraction, including hiding model references and adapting it to new storage requirements. They also contributed to integration tests, fingerprinting implementation, and database-related code, demonstrating a backend development focus. The user made changes to the core libraries and dependencies, including a version bump.
acoustic-fingerprintingefficient-algorithmaudiocsharpfingerprinting
AddictedCS/soundfingerprinting.soundtools
May 2015 - Dec 2019
Contributions:4 PRs, 57 pushes, 1 branch in 4 years 8 months
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