Wojciech Langiewicz
Lead Software Engineer at Bitcashier
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolWojciech Langiewicz is a Lead Software Engineer and founder who brings 14 years of experience building backend systems and running a senior-level outsourcing business that matches top engineering talent to select clients. Based in London, he combines hands-on contributions to notable open-source projects—like fixes and API improvements in Akka and wallet/core logic enhancements in bitcoinj—with leadership roles at Bitcashier and as CEO of Varwise. His work spans resilient, distributed systems and cryptography-adjacent financial software, reflecting deep practical knowledge of serialization, streaming, and wallet/test infrastructure. A polished communicator and technical recruiter, he pairs MSc-level computer science training with an unusual mix of enterprise-level engineering and entrepreneurial product delivery.
14 years of coding experience
Master of Science (MSc), Computer Science, 5.0, Master of Science (MSc), Computer Science, 5.0 at Politechnika Wrocławska
English, Polish, German
Stackoverflow
5,745reputation
866kreached
102answers
31questions
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Github Skills (26)
wallet10
testing10
bitcoin10
bitcoins10
akka10
hadoop10
java10
scala10
javas10
blockchain10
concurrency10
mysql9
distributed-systems9
sqlite9
bitcoinj9
Programming languages (14)
Github contributions (5)
akka/akka
Mar 2016 - Sep 2016
A platform to build and run apps that are elastic, agile, and resilient. SDK, libraries, and hosted environments.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 commits, 5 PRs, 24 comments in 6 months
Contributions summary:Wojciech primarily addressed issues related to the Akka framework, a core technology of the repository, by implementing code changes and bug fixes. They resolved serialization warnings and made adjustments to enhance the framework's functionality and usability. The commits also involved making internal components of the Akka Stream library, such as encoder and decoder, public for wider accessibility. Furthermore, the user fixed Scaladoc warnings and improved documentation, and addressed issues in Akka HTTP core.
resilientactor-modelreactiveconcurrentdistributed-actors
bitcoinj/bitcoinj
Oct 2014 - Dec 2014
A library for working with Bitcoin
Role in this project:Back-end Developer
Back-end DeveloperContributions:12 commits in 1 month
Contributions summary:Wojciech primarily contributed to the core logic and testing of the bitcoinj library. Their work included enhancing the `ECKey` class by incorporating private key formats, and adding helper methods with tests. The user also addressed existing issues related to local node connections within tests and fixed a problem involving zero-value OP_RETURN transactions. Furthermore, the user added new wallet tests, including tests for encryption and decryption, key events, and send requests, and fixed existing multi-sig tests.
bip143bitcoinjbip141bip32bip173
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