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Last update: 03.05.2023

Freelance Developer (Kotlin / Java / AWS)

Company: Mestwin Rafal Beldzikowski
Graduation: M.Sc. Applied Computer Science
Hourly-/Daily rates: show
Languages: German (Elementary) | English (Full Professional) | Polish (Native or Bilingual) | Russian (Limited professional)


I provide full-stack web development services.

I'm focused on delivering well-crafted web applications, following clean code and agile principles during my work. I work successfully as a globally distributed team member.

I strongly believe that communication is the key to a successful project, so I do my best to understand your needs and the business domain.
Currently involved in automotive e-commerce project, but worked also with manufacturing/IoT, EdTech startups.

Working with Kotlin/Java for back-end development and SPA frameworks such as Angular for front-end development.

Technologies I use for back-end development:
✅ Kotlin / Java
✅ Spring Framework (Spring Boot, Spring MVC, Spring Data, Spring Security), JHipster, REST API, microservices/monolith applications development
✅ Databases: PostgreSQL / MariaDB / MongoDB
✅ Cloud: AWS (Amazon Web Services): Lambda, S3, Firebase: FCM (Firebase Cloud Messaging), EC2
✅ CI / CD, Git, Maven / Gradle, TDD (JUnit)

Front-end & hybrid mobile apps:
✅ JavaScript / TypeScript
✅ Angular
✅ Thymeleaf / HTML / CSS / Material Design / Bootstrap, Leaflet
✅ Cross-platform mobile apps development: Ionic Framework

In addition to my everyday duties, I develop side projects and support the community by sharing my knowledge and code, and writing a technical blog on a regular basis.
Every day I learn new things and improve my software development skills.

If you'd like to work with me, please send me a message with the project description.

Project history

08/2022 - Present
Freelance Back-End Dev

01/2022 - 07/2022
Freelance Back-End Developer
FactoryPal GmbH (50-250 employees)
Industry and mechanical engineering

 ●  Developing new features and maintaining existing codebase for the real-time manufacturing SaaS product in microservices architecture

●  Working as a part of an agile team, participating in the code review

and pair programming sessions

●  Improved tests & documentation in the project

●  Successfully onboarded clients from the pharma and paper industries

●  Tech stack: Kotlin, Java, Vert.x, JUnit, AWS (Lambda, ECS, S3, SQS,

Local Availability

Only available for the countries Poland
Located in the CET timezone (GMT+1), ~4h drive from Berlin.
Able to travel to European locations (Germany & DACH / UK / Netherlands) occasionally.


Remote only. Available for full-time & part-time projects. EU VAT registered company.

Based in Poland with the ability to travel to Germany / UK occasionally.
Profileimage by Anonymous profile, Freelance Developer (Kotlin / Java / AWS) Freelance Developer (Kotlin / Java / AWS)