Christian Sommerlund

Professional experience designing and implementing a bus ticket backend and API. The system is used by several public transportation companies in Denmark and services ~100k registered customers. On a daily basis, ~500k API calls from end-user mobile apps are served, and a ticket is issued every second during rush hour. My main skills in this field centers around: * Designing intuitive and extensible API/backend/database architecture. * Writing clean and maintainable code while balancing between text-book solutions/best practices and real world requirements/business logic that rarely matches these perfectly. * Optimizing algorithms, LINQ queries and code in general to ensure swift API response times. I've also worked with a number of related topics such as: * Mathematical optimization through heuristics, constraint programming, linear programming, local-search algorithms, ... * Web crawling, data parsing/mining and machine learning. * General full-stack development (MySQL/MSSQL database -> C#/Java/PHP backend -> nginx/Java applications server/IIS -> Linux/Windows server -> HTML/CSS/JavaScript frontend)

I'm a DevOps "jack of all trades" with hands-on experience with a long range of topics. I keep an eye out on what moves around in the world of IT and have a finger on the pulse in many areas. A few examples of my experience includes: * Setting up Windows and Linux clients and servers, optimizing boot time, fixing issues, choosing the right software for the job, configuration management, webservers, ... * All-round security: SSL/TLS certificates, secure communication, secure file storage/sync, encrypted backups, software security evaluation, password management, ... * General troubleshooting/issue fixing: Analyzing obscure error messages, understanding how software works internally to determine why it fails in practice, fixing everything from printer issues to boot problems, ...