Sebastian Ksiezak - Front-end developer

Q: Where is Sebastian based?

Sebastian is based in Rzeszów, Poland .

Q: What languages does Sebastian speak?

Sebastian speaks the following languages: Polish (Native), English (Advanced), Spanish (Intermediate), German (Elementary) .

Q: How many years of experience does Sebastian have?

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.

Q: What is Sebastian's latest experience?

Sebastian's most recent position is Front End React Developer at webbar GmbH .

Q: What companies has Sebastian worked for in recent years?

In recent years, Sebastian has worked for webbar GmbH , SolvSoft , and Euplus .

Q: Which industries is Sebastian most experienced in?

Sebastian is most experienced in industries like Information Technology , Retail , and Professional Services . Sebastian also has some experience in Space Exploration .

Q: Which business areas is Sebastian most experienced in?

Sebastian is most experienced in business areas like Information Technology , Product Development , and Quality Assurance . Sebastian also has some experience in Customer Service , Marketing , and Sales .

Q: Which industries has Sebastian worked in recently?

Sebastian has recently worked in industries like Information Technology and Retail .

Q: Which business areas has Sebastian worked in recently?

Sebastian has recently worked in business areas like Information Technology , Product Development , and Quality Assurance .

Recommended expert

Rzeszów, Poland

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Experience

May 2023 - Present

3 years 1 month

Rust, Germany

Remote

Front End React Developer

webbar GmbH

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

1 year 2 months

Rzeszów, Poland

Frontend Developer

SolvSoft

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

3 years

Rzeszów, Poland

Ecommerce Specialist

Euplus

My tasks included:

Market analysis, competition.
Monitoring sales,
Running PPC advertising campaigns,
Negotiating with suppliers of goods,
Retail customer service.

Jan 2017 - Dec 2018

2 years

Technical Support in an Accounting Office

Accounting Office

Nov 2013 - Jan 2016

2 years 3 months

Android App Developer

Self-Employed

Jun 2013 - Sep 2013

4 months

Coimbra, Portugal

Erasmus Internship Program

Active Space Technologies

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, Retail, Professional Services, and Space Exploration.

Information Technology

Retail

Professional Services

Space Exploration

Business Area Experience

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

Experienced in Information Technology, Product Development, Quality Assurance, Customer Service, Marketing, and Sales.

Information Technology

Product Development

Quality Assurance

Customer Service

Marketing

Sales

Summary

I am Sebastian and I am a Frontend Developer with commercial experience in two major frameworks: React / Next.js and Vue.

I am currently working for a remote-first company based in Rust, Germany. In WebBar GmbH I am responsible for developing frontend 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 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.

In the previous position I was working as a FrontEnd Developer for a Swedish client. I was involved in the development of 4 projects, each with a slightly different level of techstack from the Vue js family.

Techstack: HTML5 CSS / SCSS JavaScript ES6 / TypeScript

Vue 2 - Options Api & Composition Api Vue 3 Vuetify 2, Quasar

Vue Router Vuex / Pinia

Git & GitLab

In the past, I had exposure to object-oriented programming in languages:

C++ (engineering thesis titled: "Autopilot measurement interface software".
Java / Android (project: "Mobile flight recorder for a UAV".

I am currently developing skills in:

Front End Development using React, Vue,
Good programming practices using design patterns, principles of clean code.

In 2024 I also plan to develop into a Full Stack Developer using:

Node js
Express, Nestjs
Mongo DB
AWS

Languages

Polish

Native

English

Advanced

Spanish

Intermediate

German

Elementary

Education

Oct 2012 - Jul 2014

Ignacy Łukasiewicz Rzeszów University of Technology

Aeronautics and Astronautics · Rzeszów, Poland

Feb 2011 - Jul 2011

Universitat Politècnica de València (UPV)

Erasmus Students Exchange, Aviation · València, Spain

Oct 2007 - Feb 2012

Ignacy Łukasiewicz Rzeszów University of Technology

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

Certifications & licenses

Android Certified Application Developer

Beginning iOS App Development - Nanodegree Program

JSE - Certified Entry-Level JavaScript Programmer

OMG-Certified UML Professional

TOEIC - Test of English for International Communication

Statistics

Experience

Total positions 6

Experience in Information Technology 6.5 y

Avg length 1 y 11 m

Longest experience 3 y

Global Experience

Countries worked in 3 (Poland, Germany, Portugal)

Primary country Poland

Expertise

Recent roles Front End React Developer, Frontend Developer, Ecommerce Specialist

Main industries Information Technology, Retail, Professional Services

Main business areas Information Technology, Product Development, Quality Assurance

Qualifications

Highest degree Bachelor

Certifications earned 5

Profile

Created

February 2024

Last Update

February 2025

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Frequently asked questions

Have questions? Find more information here.

Where is Sebastian based?

Sebastian is based in Rzeszów, Poland.

What languages does Sebastian speak?

Sebastian speaks the following languages: Polish (Native), English (Advanced), Spanish (Intermediate), German (Elementary).

How many years of experience does Sebastian have?

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.

What roles would Sebastian be best suited for?

Based on recent experience, Sebastian would be well-suited for roles such as: Front End React Developer, Frontend Developer, Ecommerce Specialist.

What is Sebastian's latest experience?

Sebastian's most recent position is Front End React Developer at webbar GmbH.

What companies has Sebastian worked for in recent years?

In recent years, Sebastian has worked for webbar GmbH, SolvSoft, and Euplus.

Which industries is Sebastian most experienced in?

Sebastian is most experienced in industries like Information Technology, Retail, and Professional Services. Sebastian also has some experience in Space Exploration.

Which business areas is Sebastian most experienced in?

Sebastian is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. Sebastian also has some experience in Customer Service, Marketing, and Sales.

Which industries has Sebastian worked in recently?

Sebastian has recently worked in industries like Information Technology and Retail.

Which business areas has Sebastian worked in recently?

Sebastian has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.

What is Sebastian's education?

Sebastian holds a Bachelor in Aeronautics and Astronautics from Ignacy Łukasiewicz Rzeszów University of Technology.

Does Sebastian have any certificates?

Sebastian has 5 certificates. Among them, these include: Android Certified Application Developer, Beginning iOS App Development - Nanodegree Program, and JSE - Certified Entry-Level JavaScript Programmer.

What is the availability of Sebastian?

Sebastian is immediately available for suitable projects.

What is the rate of Sebastian?

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.