Krystian Lieber
Verified Expert in Engineering
Software Developer
Krystian has 12 years of software development experience, including business process analysis, software design, coding, testing, and deployment. He always focuses on understanding the business's nature and exploiting the advantages of using technology to maximize the organization's benefits. Krystian strongly believes in technology-driven business.
Portfolio
Experience
Availability
Preferred Environment
Git, TypeScript, Java, IntelliJ IDEA, Amazon Web Services (AWS), Serverless, Cloud Native
The most amazing...
...thing I've designed and coded was a framework for comparing different classification algorithms.
Work Experience
VP of Software Engineering
Trilogy
- Brought a new cloud cost optimization software to market.
- Prepared detailed specs to allow a multinational, distributed team of remote developers to deliver at scale, with speed and quality.
- Oversaw the launch and migration to the new version, working with customers to reach 100% customer success.
Owner | Developer
Self-Employed
- Created an application to ease the process of post office complaints for county court bailiffs.
- Build a system for a new office from scratch.
- Migrated the main application from SQL Server to PostgreSQL.
- Created dozens of small applications to optimize business processes.
Senior Software Developer
Optiva
- Led the developers on a Cloud Migration Project, the first world OCS in the cloud.
- Migrated existing system to cloud native technologies using Kubernetes and Google Cloud Platform.
- Worked with customer engineering teams building excellent relations.
IT Manager
County Court Bailiff Office
- Created an intelligent document management system using OCR and machine learning using JAVA.
- Built integration applications for faster data exchange with other government organizations.
- Developed dozens of small applications to optimize business processes.
- Designed and deployed a virtual desktop infrastructure.
Researcher
Warsaw University of Technology
- Created a toolkit for analysis of different machine learning algorithms.
- Developed a document classification part of the PASSIM/SYNAT (the repository of the people, organizations and events in Polish science).
- Worked with a team of researcher to integrate systems.
- Prepared a presentation for a project conference.
Experience
PSIR
• Written in Java.
• Defines interfaces for implementations of algorithms.
• Different dataset preparation methods.
• Running algorithms with various parameters.
• Distributed, concurrent executions of tasks.
• Gathering results.
• Calculating statictics and scores.
• Reporting using templates (Apache Velocity) to TeX.
ZUS Application Integration
No API is available therefore the whole integration is made using selenium and simulation of the client using browser.
The project started in 2011. It underwent major changes in 2013, the platform was renewed therefore the client part of the platform was changed and it is still is use.
Automatic Billing System
Education
Master of Science in Computer Science, Computer Information System Engineering
Warsaw University of Technology - Warsaw, Poland
Bachelor of Science in Computer Science, Computer Information System Engineering
Warsaw University of Technology - Warsaw, Poland
Skills
Libraries/APIs
Selenium WebDriver
Tools
Mercurial, Apache Maven, Git, Grunt, Bower, Java Concurrency, IntelliJ IDEA
Frameworks
Swagger, JPA, JUnit, Selenium, Spring, AngularJS
Paradigms
Agile Software Development, Concurrent Programming
Languages
Java, T-SQL (Transact-SQL), SQL, Python, R, TypeScript, TypeScript 3
Platforms
NetBeans, Windows, Amazon Web Services (AWS), Cloud Native, Google Cloud Platform (GCP)
Storage
Microsoft SQL Server, H2, Neo4j, Google Cloud Spanner
Other
VMware ESXi, Remote Desktop Services, Web Scraping, Serverless, Low Latency, Online Charging Systems (OCS), Telecom Business Support Systems (BSS), FinOps, Cost Reduction & Optimization, Cost Cutting, Cost Analysis
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
Share your needs
Choose your talent
Start your risk-free talent trial
Top talent is in high demand.
Start hiring