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Sebastian Ksiezak-FullStack Engineer

Sebastian Ksiezak
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Poland

Check rate

Experience

May 2023 - Present
Rust, Germany
Remote

Front End React Developer

webbar GmbH

Position Summary
Front End React Developer at webbar GmbH
Industries
Information Technology
Business Areas
Information Technology
Product Development
Quality Assurance

I am currently working for a remote-first company based in Rust, Germany. In WebBar GmbH I am responsible for developing front end part of the multitenant system.

Working on this project, I am using technologies and tools such as:

  • JavaScript / TypeScript,
  • React and Next.js,
  • HTML5 and JSX,
  • CSS/SCSS and Tailwind,
  • Recoil for app state management,
  • GraphQL,
  • TanStack Query to improve work with RESTful APIs
  • StoryBook, Cypress e2e Tests,
  • Docker,
  • JetBrains for Project Management,
  • WebStorm as Programming IDE,
  • CI/CD pipeline implemented with GitHub and DigitalOcean.

My Tasks include:

  • creating core components with Storybook, Cypress e2e tests and Tailwind for CSS,
  • building complex layouts and pages for PWA app with React and Next.js technology,
  • managing app state with Recoil library,
  • fetching backend data using GraphQL and TanStack Query library,
  • taking care of good quality code using design patterns and principles of clean code.,
  • taking care of CI/CD pipeline green state,
  • daily meetups with an international team, held in english.
Mar 2022 - Apr 2023
Rzeszów, Poland

Frontend Developer

SolvSoft

Position Summary
Frontend Developer at SolvSoft
Industries
Information Technology
Business Areas
Information Technology
Product Development

In this position I was working as a front end developer using Vue js.

  • I was involved in the development of 4 projects for a Swedish client.
  • I worked in a team of 12 people in weekly sprints.
  • My tasks also included contact with the client, joint analysis of needs and solutions. The discussions were conducted in English.

Projects varied in technological level:

  • I worked in an older project written in pure JavaScript, Vue 2 - options api and Vuex.
  • As well as in two newer ones that had Vue 2 with Composition API, Vuex and Type Script.
  • And in a project written in Vue 3, with full TypeScript typing and implemented Pinia and Vite.

For component building and project styling I used:

  • Vuetify,
  • Quasar,
  • CSS/SCSS.

Development environment:

  • I was using VSCode editor.
  • For version control, I used Git with GitLab.
Jan 2019 - Dec 2021
Rzeszów, Poland

Software Engineer

Euplus

Position Summary
Software Engineer at Euplus
Industries
Information Technology
Business Areas
Information Technology
Product Development

Implementing custom solutions for contract clients in Web Technologies

Jan 2017 - Dec 2018

Infrastructure Engineer

Accounting Office

Position Summary
Infrastructure Engineer at Accounting Office
Industries
Professional Services
Business Areas
Information Technology

Managed Servers, firewalls, VPNs, Wi-Fi and connectivity. Managed computers, networks and user accounts. Hands-on support for employees, workstations and day-to-day issues.

Nov 2013 - Jan 2016

Android App Developer

Contracts

Position Summary
Android App Developer at Contracts
Industries
Information Technology
Business Areas
Information Technology
Product Development

Worked with old school Android Systems, before even Android Studio was invented ;)

Implemented Google maps integrations for custom solutions.

Jun 2013 - Sep 2013
Coimbra, Portugal

Erasmus Internship Program

Active Space Technologies

Position Summary
Erasmus Internship Program at Active Space Technologies
Industries
Space Exploration
Business Areas
Information Technology
Product Development
Quality Assurance

As part of the Erasmus Internship Program at Active Space Technologies (Systems and Controls department), I participated in the InTrain project and performed the following tasks:

  • testing ZigBee PRO modules,
  • development of software for displays (C++ programming in Visual Studio),
  • development of software for embedded systems (C programming in Eclipse),
  • testing of sensors,
  • assisting with documentation.

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Professional Services, and Space Exploration.

Information Technology
Professional Services
Space Exploration
Profile match chart

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, and Quality Assurance.

Information Technology
Product Development
Quality Assurance
Profile match chart

Summary

FullStack Software Engineer

Languages

Polish
Native
English
Advanced
Spanish
Intermediate
German
Elementary

Education

Oct 2012 - Jul 2014

Ignacy Łukasiewicz University of Technology in Rzeszów

Aeronautics and Astronautics · Rzeszów, Poland

Feb 2011 - Jul 2011

Polytechnic University of Valencia (UPV)

Erasmus Student Exchange, Aviation · València, Spain

Oct 2007 - Feb 2012

Ignacy Łukasiewicz University of Technology in Rzeszów

Engineer (Eng.) · Aeronautics and Astronautics · Rzeszów, Poland

Certifications & licenses

Android Certified Application Developer

OMG-Certified UML Professional

TOEIC - Test of English for International Communication

Statistics

Experience

Total positions 6
Experience in Information Technology 9.5 y
Avg length 1 y 11 m
Longest experience 3 y 2 m

Global Experience

Countries worked in 3 (Poland, Germany, Portugal)
Primary country Poland

Expertise

Recent roles Front End React Developer, Frontend Developer, Software Engineer
Main industries Information Technology, Professional Services, Space Exploration
Main business areas Information Technology, Product Development, Quality Assurance

Qualifications

Highest degree Bachelor
Certifications earned 3

Profile

Created
Last Update

Frequently asked questions

Have questions? Find more information here.

Sebastian speaks the following languages: Polish (Native), English (Advanced), Spanish (Intermediate), German (Elementary).
Sebastian has at least 12 years of experience. During this time, Sebastian has worked in at least 6 different roles and for 6 different companies. The average length of individual experience is 2 years and 11 months. Note that Sebastian may not have shared all experience and actually has more experience.
Based on recent experience, Sebastian would be well-suited for roles such as: Front End React Developer, Frontend Developer, Software Engineer.
Sebastian's most recent position is Front End React Developer at webbar GmbH.
In recent years, Sebastian has worked for webbar GmbH, SolvSoft, and Euplus.
Sebastian is most experienced in industries like Information Technology, Professional Services, and Space Exploration.
Sebastian is most experienced in business areas like Information Technology, Product Development, and Quality Assurance.
Sebastian has recently worked in industries like Information Technology.
Sebastian has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.
Sebastian holds a Bachelor in Aeronautics and Astronautics from Ignacy Łukasiewicz University of Technology in Rzeszów.
Sebastian has 3 certificates. These include: Android Certified Application Developer, OMG-Certified UML Professional, and TOEIC - Test of English for International Communication.
Sebastian will be available from August 2026.
Sebastian's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.
To hire Sebastian, click the Meet button on the profile to request a meeting and discuss your project needs.