Jan Uhlig
Software Developer at JustOn
Oederan, Saxony, Germany
Summary
🤩
Rockstar🎓
Top SchoolJan Uhlig is a pragmatic software developer with nine years of professional experience and a deep background in backend systems, currently building products at JustOn after a long tenure at Mailingwork GmbH. He contributes to prominent open-source Erlang projects such as Erlang/OTP, Ranch, and mysql-otp, where his work spans protocol-level fixes, transport enhancements, and database client features like COM_CHANGE_USER and prepared-statement validation. Comfortable with low-level networking, concurrency and SSL concerns, Jan has a knack for improving robustness and test coverage in production-grade systems. Trained as a Dipl.-Ing. in Computer Science, he pairs academic rigor with hands-on contributions to infrastructure that keep connections stable and services resilient. Notably, his open-source changes reveal attention to subtle API behaviors (e.g., supervisor auto-shutdown and named curve/type exports) that prevent edge-case failures in distributed environments.
9 years of coding experience
18 years of employment as a software developer
Dipl.-Ing. (FH), Computer Science, Dipl.-Ing. (FH), Computer Science at Westsächsische Hochschule Zwickau
English, German
Github Skills (16)
database10
databases10
ssl10
erlang10
relational-databases10
otp10
mysql10
sql-database10
mariadb10
tcp10
testing10
socket-io9
set-theory9
socket9
concurrency8
Programming languages (7)
Github contributions (5)
ninenines/ranch
Nov 2017 - Jul 2022
Socket acceptor pool for TCP protocols.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:27 reviews, 70 commits, 71 PRs in 4 years 9 months
Contributions summary:Jan primarily contributed to the Ranch project by adding and improving transport functions, notably `getopts/2` and `getstat/{1,2}`. They implemented these capabilities across both TCP and SSL transports, enhancing the socket acceptor pool's functionality. The user also addressed bugs, improved test coverage for the new functions, and ensured existing connections were maintained during listener restarts.
sockettcp-protocol
mysql-otp/mysql-otp
Nov 2018 - Feb 2022
MySQL/OTP – MySQL and MariaDB client for Erlang/OTP
Role in this project:Back-end Developer
Back-end DeveloperContributions:29 reviews, 31 commits, 49 PRs in 3 years 2 months
Contributions summary:Jan primarily focused on enhancing the Erlang/OTP MySQL client for MariaDB and MySQL databases. Their contributions involved fixing specifications, implementing synchronous stopping of connections, and addressing parameter validation for prepared statements and parameterized queries. They also implemented the COM_CHANGE_USER command, allowing users to switch to a different user without closing the connection, and integrated support for features like filtering results and local data loading.
erlangmariadbmysql
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