Jan R.-Frontend Mentor
Check rate
Experience
Frontend Mentor
TeachMeSkills
- 150 hours of frontend lectures
- Two tracks of lecturing: "HTML & CSS" and "JS Basics"
- More than 30 students overall.
Senior Frontend Engineer
Goldman Sachs
Led solo refactoring and strategic redesign of a core application, ensuring longevity, cost efficiency, and improved business operations.
Led a major uplift of a core monorepo used across the entire GS organisation.
Delivered a new budget planning automation application in two weeks, demonstrating project management and coding skills under pressure.
Directed technical aspects of a central dashboard redesign, ensuring smooth delivery within a 7-day timeframe, showcasing leadership and efficiency.
Mentored developers of all levels, fostering a collaborative learning environment and promoting skill development.
Implemented CI/CD pipelines for frontend projects, ensuring seamless integration, automated testing, and efficient deployment.
Frontend Engineer
Oomnitza
Managed to improve app loading speed by two times by successfully delivering major tech stack improvements.
Provided top-score accessibility of a large application by leading the redesign.
Improved static analysis flow so that all formatting is done and checked automatically.
Regularly mentored junior-to-mid developers.
Managed the tech debt backlog.
Developed new features using React, JavaScript, TypeScript, and Redux.
Frontend Engineer
Net2Phone
Internationalized a large application.
Developed frontend feature flags architecture.
Established static analysis flow from git hooks to CI/CD checks.
Managed the tech debt backlog.
Participated in architecture discussions.
Mentored junior developers.
Developed new features using Angular and TypeScript.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Banking and Finance, Telecommunication, Information Technology, and Education.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology and Project Management.
Summary
Senior Frontend Engineer with seven years of experience. Founder of the best Chess Calendar App out there.
Skills
- Next.Js
- React
- Typescript
- Tailwind
- Graphql
- Tanstack-Query
- Jotai
- Javascript
- Html5
- Css3
- Sass
- Angular
- Node.Js
- Headless Cms
- Redux
- Webpack
- Cra
- Vite
Languages
Education
Belarusian State University of Informatics and Radioelectronics
Bachelors · Minsk, Belarus
Certifications & licenses
Polish B2
Polish State Commission for Polish Language assessments
FCE - Grade A (C1)
Cambridge University Press & Assessment
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Jan is based in Warsaw, Poland and prefers 100% remote projects.
Jan speaks the following languages: Belarusian (Native), Russian (Native), English (Advanced), Polish (Intermediate).
Jan has at least 8 years of experience. During this time, Jan has worked in at least 3 different roles and for 4 different companies. The average length of individual experience is 2 years. Note that Jan may not have shared all experience and actually has more experience.
Based on recent experience, Jan would be well-suited for roles such as: Frontend Mentor, Senior Frontend Engineer, Frontend Engineer.
Jan's most recent position is Frontend Mentor at TeachMeSkills.
In recent years, Jan has worked for TeachMeSkills and Goldman Sachs.
Jan is most experienced in industries like Banking and Finance, Telecommunication, and Information Technology. Jan also has some experience in Education.
Jan is most experienced in business areas like Information Technology and Project Management.
Jan has recently worked in industries like Banking and Finance and Education.
Jan has recently worked in business areas like Information Technology and Project Management.
Jan holds a Bachelor from Belarusian State University of Informatics and Radioelectronics.
Jan has 2 certificates. These include: Polish B2 and FCE - Grade A (C1).
The availability of Jan needs to be confirmed.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 12 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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