~~~~~~~~~~~~~~
- Sebastian Pieczynski
- Software Developer
- s.pieczynski@gmail.com
- (48) 668 248 360
- Opole
- Poland
- http://sebee.website
Work History
IAV Polska S.A.
- 2024-02-05 - currently
- System Engineer
- Hybrid, Poland/Germany
- https://iav.com/en
Developing and maintaining software supporting workflows in automotive industry. Applications developed in Python and NodeJS.
- REST
- Jest
- API
- Backend
- Javascript
- Python
- Hybrid
- Remote
- Automotive
MoreCode Sp. z o.o.
- 2022-03-01 - 2023-07-01
- React Developer
- Remote, Poland
- https://morecode.ai
I was responsible for project’s architecture (database design, frameworks selection etc.) as well as building both frontend and backend with GraphQL. Application core technologies used are: React, Typescript, PrismaJS, TailwindCSS. Deployed to AWS used PostgreSQL as a database. Technical lead for frontend decisions within small team (3-4 members) as well as providing guidance for junior frontend developer. Requirements were gathered with the client and designs done with Figma. Frontend projects for international company from cyber-security space.
- Architected the application for personal trainings, designed database allowing any type and combination of exercises as well as normalized it for machine learning use.
- React
- GraphQL
- API
- Backend
- Frontend
- Javascript
- Linux
- MacOS
- REST
- CSS
- Tailwind
- Typescript
- Database Design
- Remote
ifm ecolink Sp. z o.o
- 2012-06-19 - 2022-03-01
- Senior IT Specialist
- Opole, Poland
- https://ifm.com
Helping users and solving issues affecting both office employees as well as production area. Creating applications that help people complete their work efficiently as well as design ISO processes that assure reliable outcomes.
- Saved thousands of euro yearly by creating web applications to automate processes.
- Developed application to track and distribute ISO document.
- Web app to manage and monitor tickets and machines in production.
- Managed and planned budget for IT department.
- Helped in designing security systems as well as network for production halls and new buildings.
- As an only IT person on site helped people complete their tasks while company grew to more than 500 employees.
- React
- PHP
- MongoDB
- PostgreSQL
- MySQL
Opservice Sp. j.
- 2012-05-21 - 2012-06-15
- Java Developer
- Opole, Poland
Implemented gate payment integration for the website. Bugfixes in code for government clients.
- Java
- CSS
Koszalińska Agencja Rozwoju Regionalnego S. A.
- 2010-04-01 - 2012-05-21
- IT Specialist
- Koszalin, Poland
- https://karrsa.eu
Helping users and solving issues affecting both office employees. Managing and creating company's website using WordPress. Building custom plugins and implementing optimizations using modern (at the time) CSS features.
- Improved performance by 1000% percent by identifying bottlenecks in current implementation.
- Redesigned and implemented new website using WordPress and custom theme.
- Built mesh-like infrastructure for multi-story building.
- PHP
- MySQL
- WordPress
- CSS
Freelance Web Developer
- 2009 - 2011
- Web Developer
- Koszalin, Poland
Web development using Joomla and WordPress, customized plugins and solutions implementation.
- Built websites for clients using Joomla and WordPress
- PHP
- MySQL
- WordPress
- CSS
Education
Technical University of Koszalin
- Computer Science
- Masters Degree
2011-01-01 - 2011-02-24
Instituto Superior Téchnico
- Software Development
- Masters Degree
2008-08-15 - 2009-06-01
Technical University of Koszalin
- Computer Science
- Engineers Degree
2004-10-01 - 2009-09-12
Skills
React
Next level: Advanced60%
Intermediate
- HTML
- CSS
- Javascript
- JSX
- Frontend
- Technical
CSS
Next level: Expert55%
Advanced
- HTML
- CSS
- Javascript
- Frontend
- Technical
Typescript
Next level: Expert30%
Advanced
- HTML
- CSS
- Javascript
- Frontend
- Backend
- Technical
NodeJS
Next level: Intermediate20%
Beginner
- HTML
- CSS
- Javascript
- Backend
- Technical
TailwindCSS
Next level: Advanced49%
Intermediate
- HTML
- CSS
- JSON
- Technical
GraphQL
Next level: Advanced30%
Intermediate
- GraphQL
- API
- Backend
- Technical
Prisma.js
Next level: Advanced40%
Intermediate
- Javascript
- SQL
- JSON
- PostgreSQL
- Technical
Languages
Polish
100%
Level: Native speaker
English
90%
Level: Fluent Technical Language
Japanese
5%
Level: Beginner
Projects Portfolio
Personal Website
2022-09-04 - currently
Used to learn about Next.js and latest features in React. Built with TailwindCSS and MDX and uses Server Actions and Server Components.Personal website with articles powered by Next.js 13, React and MDX.
- React
- Frontend
- TailwindCSS
- Tailwind
- MDX
- Next
- Next.js
- SSR
- Server Actions
- React Server Components
- Javascript
- Typescript
Training Application
2022-09-01 - 2023-07-01
Database schema is normalized and designed for any exercise regime that can be thought. Built as a React application with GraphQL and TailwindCSS and TailwindUI.Application that connects Trainers to Trainees and allows to create any type of training regime.
- React
- GraphQL
- API
- Frontend
- Backend
- TailwindCSS
- Tailwind
- PostgreSQL
- Database Design
- Architecture Design
- Redwood
- Typescript
- Javascript
- AWS
Various frontend projects for a company in the cybersecurity space
2021-11-01 - 2023-07-01
Completed two major projects related to UI redesign while adding new features and optimizing performance and user experience.Frontend projects for a company serving millions of customers in the world. Built with React Hooks and best practices.
- Linux
- MacOS
- REST
- API
- Frontend
- CSS
- Typescript
- Javascript
- Git
Internal Document Management and Production Ticketing System
2014 - 2020
Project was considered to be implemented globally worldwide by the company. Followed closely what the customer needed and was in constant development during the years. To this day it is utilized and brings value to the company optimizing document delivery and management.Document management for ISO standardization documents. Allows for maintenance of ISO standards for the company by a single person department since 2015. Closely developed with the stakeholder.
- PHP
- MySQL
- CSS
- Bootstrap
- Doctrine
- Symfony
- Frontend
- Backend
- Monorepo
- Git
Internal Document Management and Production Ticketing System
2015 - 2020
Project has saved thousands and possibly hundreds of thousands of euros to this day in operation costs. Another commercial project was rejected due to cost and it offered similar functionality.Ticketing system and machine park maintenance application. Minimizes time to fix the issue and allows better tracking of potential production blockers, improves production process. Generates thousands of euro savings monthly. Close development with management and maintenance department.
- PHP
- MySQL
- CSS
- Bootstrap
- Doctrine
- Sonata
- Symfony
- Frontend
- Backend
- Monorepo
- Git
Temperature monitoring and visualization
2018 - 2018
Monitoring created for warehouse material safety and production approval. Thanks to MongoDB's aggregation framework preparing data for the server was counted in milliseconds instead of tens seconds.Monitoring of areas temperature, humidity as well as gathering historical data for audits of manufacturing goods storage..
- Javascript
- React
- ChartJS
- CSS
- MongoDB
- Frontend
- Backend
- NodeJS
- Git
Log file analyzer
2017 - 2017
Project used streams of data and filtered based on user criteria since files were huge 10s of megabytes in multiple files. It was packaged into an executable that could be run without installing NodeJS.CLI application to analyze and filter data from multiple external reports generating single report with requested data.
- Javascript
- Windows
- NodeJS
- Git
Dream Job
Current Status:
I am currenty employed at IAV Polska S.A. as System Engineer
Contract types:
I accept contracts for: permanent work.
I love helping others and I do believe that writing quality software can improve people's lives.
Working Years
14
Coding Professionally
6.5
Coding since I was ~9
12
Office Experience
12
IT Experience
7.5
Husband
12
Places I would 💓 to work from: remote or Opole, Poland or Hawaii, USA 😎
When working remotely and there are no offices in my location I would prefer to work remotely at least 5 days per week.
If there are offices in my location I would prefer to work in office at most 4 days per month.
Certificates & Publications
Epic React - Testing React Apps
- Kent C. Dodds
2024-01-05
Epic React - React Performance
- Kent C. Dodds
2024-01-04
Epic React - Advanced Patterns
- Kent C. Dodds
2023-12-28
Epic React - Advanced Hooks
- Kent C. Dodds
2023-12-27
Joy of React
- Josh W. Comeau
2023-07-23
CSS for JS Developers
- Josh W. Comeau
2022-06-24
Epic React - React Hooks
- Kent C. Dodds
2020-10-20
Epic React - React Fundamentals
- Kent C. Dodds
2020-10-01
Beginner Javascript Course
- Wes Bos
2019-11-29
Node.js Masterclass with Express & MongoDB
- Brad Traversy
2019-11-4
React Front to Back
- Brad Traversy
2019-09-09
Advanced React and GraphQL
- Wes Bos
2018-10-18
ES6 for Everyone
- Wes Bos
2017-11-15
React for Beginners
- Wes Bos
2017-11-15
First Certificate in English
- Cambridge
2003-12
Comparison analysis for websites based on HHS guidelines.
- National Conference for Students and Young Researchers
Article about quantitative methodology of comparing and ranking websites before Google Lighthouse or other automated testing tools were commonly used. It was also used by Walery Susłow from Technical University of Koszalin to quantitatively rank and grade students' work. It allows to compare end products to selected set of metrics and at the same time gives full control over each metric importance. This allows to rank products/websites while limiting personal biases to minimum since metrics in turn are also quantitative.