Sebastian Ksiezak
Front-end developer
Experience
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.
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.
Ecommerce Specialist
Euplus
My tasks included:
- Market analysis, competition.
- Monitoring sales,
- Running PPC advertising campaigns,
- Negotiating with suppliers of goods,
- Retail customer service.
Technical Support in an Accounting Office
Accounting Office
Android App Developer
Self-Employed
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.
Industries Experience
See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.
Experienced in Information Technology (6 years), Retail (3 years), Professional Services (2 years), and Space Exploration (0.5 years).
Business Areas Experience
The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.
Experienced in Information Technology (6.5 years), Product Development (6.5 years), Quality Assurance (3 years), Customer Service (3 years), Marketing (3 years), and Sales (3 years).
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
Education
Ignacy Łukasiewicz Rzeszów University of Technology
Aeronautics and Astronautics · Rzeszów, Poland
Universitat Politècnica de València (UPV)
Erasmus Students Exchange, Aviation · València, Spain
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
Profile
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