Sergej M.-Full Stack Developer
Check rate
Experience
Full Stack Developer
NERDZZ Digitalagentur GmbH
- Built full-stack applications using the MERN stack for urban planning and real estate projects.
- Developed custom dashboards with React and chart libraries (Recharts, D3.js).
- Created RESTful APIs with Express and Node.js, and stored data in MongoDB.
- Led the team’s adoption of Agile, improving sprint delivery and collaboration.
Full Stack Developer
Kilwar LLC
- Developed and maintained interactive React applications for geospatial data visualization.
- Built reusable UI components with React, integrated REST APIs with Axios and Redux.
- Improved performance of data-heavy components, reducing load times by 30%.
- Implemented end-to-end testing using Cypress.
- Worked closely with backend and DevOps teams to deploy microservices and enhance system scalability.
Full Stack Developer
The MASCC
- Built and maintained e-commerce platforms using React, Vue, and Node.js.
- Integrated 3rd-party APIs (Stripe, Google Maps, SendGrid) and built internal APIs.
- Designed MySQL and MongoDB schemas for scalable storage.
- Enhanced frontend SEO and accessibility performance.
- Worked on the admin dashboard for real-time order and user management.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Retail, and Real Estate.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Quality Assurance, and Project Management.
Summary
Senior MERN Stack Developer with 8+ years of experience in full-stack web development, with a strong focus on JavaScript-based technologies including MongoDB, Express.js, React.js, and Node.js. Skilled in designing and building responsive, scalable applications and complex REST APIs. Excellent communication and teamwork skills, experienced in agile environments and passionate about delivering high-quality software solutions.
Skills
- Frontend: React.Js, Redux, Next.Js, Vue.Js, Html5, Css3, Tailwind Css, Bootstrap, Material Ui
- Backend: Node.Js, Express.Js, Restful Apis, Socket.Io, Jwt Auth
- Database: Mongodb, Mongoose, Mysql, Postgresql
- Devops & Tools: Git, Github, Docker, Jenkins, Nginx, Pm2, Vercel, Netlify
- Testing & Debugging: Jest, Mocha, Cypress, Postman
- Other: Agile, Scrum, Jira, Figma, Rest Api, Websocket, Typescript
Languages
Education
University of Peloponnese
Bachelor of Software Engineering · Computer Science · Tripoli, Greece
Certifications & licenses
Triplebyte Engineering Certificate
Triplebyte
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Sergej is based in Florina, Greece and prefers 100% remote projects.
Sergej speaks the following languages: Greek (Intermediate), English (Intermediate), German (Elementary).
Sergej has at least 9 years of experience. During this time, Sergej has worked in at least 1 role and for 3 different companies. The average length of individual experience is 3 years and 1 month. Note that Sergej may not have shared all experience and actually has more experience.
Based on recent experience, Sergej would be well-suited for roles such as: Full Stack Developer.
Sergej's most recent position is Full Stack Developer at NERDZZ Digitalagentur GmbH.
In recent years, Sergej has worked for NERDZZ Digitalagentur GmbH and Kilwar LLC.
Sergej is most experienced in industries like Information Technology, Retail, and Real Estate.
Sergej is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. Sergej also has some experience in Project Management.
Sergej has recently worked in industries like Information Technology and Real Estate.
Sergej has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.
Sergej holds a Bachelor in Computer Science from University of Peloponnese.
Sergej has 1 certificate: Triplebyte Engineering Certificate.
The availability of Sergej 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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