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Jan Elznic

Jan Elznic

Fullstack Software Engineer

The greatest mistakes in life are made by the most successful among us,
those who make no mistakes have no opportunity to learn.
(my motto)

About me

My name is Jan Elznic, I am a full-stack developer and software architect, currently I am 38 years old and I focus on software development for web, mobile, and other platforms. I have nearly 20 years of professional experience building applications and modern backend systems with a strong focus on security, scalability, and performance. I wrote my first website back in 1998 while still at school. Ten years later (2008) I officially started my business. I spent several years working as a freelancer and also experienced full-time roles for international startups, mid-size companies, and large multinational corporations. You can learn more about my professional career in my resume.

I am currently actively looking for new opportunities — either full-time employment or a long-term project (B2B). In my last role, I worked on multiple short-term projects within custom development; now I would prefer to focus on a single main product, develop it long-term, and collaborate with a clear direction and roadmap. Samples of my work can be found on GitHub.

Among other things, I am passionate about artificial intelligence (AI) and LLM chatbots, security, and accessibility. I test source code to achieve the highest possible quality, usability, and performance in the shortest reasonable time. I regularly use unit tests, end-to-end tests, performance tests, penetration tests, and integration tests, including automated ones (pipelines). I work closely with teams, am used to daily code reviews, sharing results, consulting with colleagues, implementing changes, and refactoring. Some of my favorite modern testing tools include Playwright and Jest.

I most often work with JavaScript/TypeScript (Angular, React). In Node.js, my preferred framework is NestJS, as well as modern AdonisJS. In Python, I most frequently use FastAPI, but I also have historical experience with projects written in Django. Additionally, I have built a significant number of applications in Java, mainly in corporate environments using Spring Boot and Hibernate ORM, elementary with with C#/.NET.

In my free time, I spending time with my children, meeting friends, culture, sports, and outdoor activities (cycling, skiing, horseback riding, rafting in summer), as well as developing browser extensions (e.g. Add To Reading List) and chatbots for community portals.

Resume in PDF

Portfolio

I have more than 18 years of professional experience in IT, 12 years in an international environment, 10 years in technology management…

References

Selected clients I have worked with so far:

  • Alza.cz
  • Škoda Auto
  • Creditas Group
  • INU.com
  • Seznam.cz
  • Red Hat
  • O2 CZ
  • MSD
  • Centrum.cz
  • Cemex
  • KKCG
  • Vodafone ČR
  • Slovak Telekom

Selected recent projects:

Contact

Phone (+420) 732 927 927
E-mail jan@elznic.com

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