Tymon Przemyslaw Radzik, Developer in London, United Kingdom
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Tymon Przemyslaw Radzik

Verified Expert  in Engineering

Software Developer

Location
London, United Kingdom
Toptal Member Since
November 4, 2021

Tymon is a software developer with extensive experience in managing projects and ensuring delivery at pace, entirely focused on providing his clients with tailor-made IT solutions of exceptional quality. He specializes in back-end solutions, including the design and creation of REST APIs with Python and DRF; he is also skilled in front-end development. As a contributor to various open-source programs, Tymon has mentored students and juniors to help them grow and improve their coding practices.

Portfolio

Freelance
CSS, JavaScript, jQuery, React, Python, SQL, MySQL, PostgreSQL, Django...
AND Digital
Python, GraphQL, REST, APIs, Django, Django REST Framework, MySQL, Integration...
CODEZAP Limited
Python, Django, Agile Software Development, REST APIs, SQL, Git, Full-stack...

Experience

Availability

Full-time

Preferred Environment

MacOS, Linux, PyCharm, Git, Postman

The most amazing...

...project I've created is a highly-automated recruitment system that was used to hire over 200 employees and saved my client tens of thousands of dollars on HR.

Work Experience

Full-stack Software Developer

2014 - PRESENT
Freelance
  • Created multiple web applications for clients according to their specifications, often in the form of user stories. Designed back-end systems using various data storing SQL-based solutions with MySQL and PostgreSQL, and non-SQL-based with MongoDB.
  • Maintained codebases with GitHub and GitLab integrated with CI/CD solutions.
  • Deployed projects using cloud solutions provided by Amazon Web Services (AWS).
Technologies: CSS, JavaScript, jQuery, React, Python, SQL, MySQL, PostgreSQL, Django, Django REST Framework, APIs, REST APIs, Git, GitLab, GitHub, Data Engineering, Travis CI, CI/CD Pipelines, Unit Testing, MongoDB, SQLite, Amazon Web Services (AWS), Full-stack, Integration, REST, Front-end, TypeScript, API Development, Moodle, Network Security, Writing & Editing, Web Security, Technical Writing, Scraping, Web Scraping, Data Scraping, Back-end Architecture, Cloud Architecture, IT, Architecture, IT Project Management

Product Developer

2022 - 2023
AND Digital
  • Worked with the employer's clients from various industries to develop top-quality software (primarily back-end solutions – REST APIs, GraphQL, including design, creation, and integration).
  • Tracked and fixed bugs using Jira as a reporting tool.
  • Performed code reviews of merge requests submitted by other developers.
  • Interviewed candidates for technical screening job openings at the company.
Technologies: Python, GraphQL, REST, APIs, Django, Django REST Framework, MySQL, Integration, API Development, Amazon Web Services (AWS), Network Security, Web Security, Back-end Architecture, Cloud Architecture, IT, Architecture

Director and Co-founder

2019 - 2021
CODEZAP Limited
  • Managed a startup providing IT support and software development services for small- and medium-sized private companies operating in consulting and services industries.
  • Created a web system to manage the human resources of a medium-sized company.
  • Improved the performance of the client's webpage on the Google PageSpeed score from 9/100 to 94/100 on computers. The average loading time on mobile devices reduced from 21.1 seconds to 5.5 seconds, making it around 75% faster.
Technologies: Python, Django, Agile Software Development, REST APIs, SQL, Git, Full-stack, Integration, REST, Front-end, TypeScript, API Development, Network Security, Writing & Editing, Web Security, Technical Writing, Back-end Architecture, Cloud Architecture, IT, Architecture, IT Project Management

Software Developer and Mentor

2015 - 2017
Sugar Labs
  • Mentored students participating in Google Code-in and Google Summer of Code programs, evaluated their code and working practices, and advised them on potential ways to grow.
  • Performed pull request merges, raised issues and classified and responded to issues raised by others, assigned work, and prepared releases. I also collaborated with other open-source developers on GitHub.
  • Created, developed, and improved multiple Sugar "activities"–educational apps used by children from all around the world. I also addressed over 100 GitHub issues.
  • Won Google Code-in 2016, an international annual programming competition hosted by Google LLC.
Technologies: JavaScript, Python, Git, Web Development, Front-end, IT, IT Project Management

Software Developer

2014 - 2016
The FOSSASIA
  • Modified different WordPress websites belonging to the organization, applying changes to templates and custom plugins. Used technologies include PHP, JavaScript, HTML, and CSS.
  • Reviewed the work of students participating in the Google Code-in 2015 programming contest, highlighting issues and suggesting changes.
  • Contributed to the creation of a cross-platform mobile application with Apache Cordova (JavaScript, HTML, and CSS) to support the organization of FOSSASIA conferences.
Technologies: WordPress, HTML, CSS, JavaScript, Web Development, Team Mentoring, PHP, Cordova, Full-stack, Front-end, IT

Custom Recruitment System

As the only developer working for a business client, I created a full-stack project consisting of a custom recruitment system to help the client recruit a significant number of temporary staff members. This system allows collecting their resumes, automatically contacting referees, and assigning "suitability" scores based on several criteria set by the client. I created the back end as a RESTful API in Python with Django REST Framework (DRF). I integrated it with a relational MySQL database and MailChimp API to perform mass mailings. I also built the front end using React and a modified for-sale theme. I used Git and GitLab as CVS integrated a CI/CD pipeline with Travis CI.

The client used the system to recruit over 200 new employees and manage their data without increasing spending on their HR department due to the high level of process automation. This represented an estimated saving of $120,000 a year, meaning the cost of hiring three qualified HR employees.

Resource Management System

As a part of a team, I co-created a web system to manage HR for a medium-sized company working in the consulting industry. The back end consisted of an independent REST-ful API with Python, Django, Django REST Framework (DRF), PostgreSQL, and JWT (JSON Web Token) authentication. The front end—also built from scratch—used technologies like React, jQuery, and Ajax to asynchronously communicate with the API without the need to reload. To meet the client's rigorous expectations and customize the product, we didn't base the front end on publicly available templates.

We have been providing the client with continuous support related to the product delivered.

Back-end Solution for a Biotechnology Reporting Tool

Worked as a back-end developer for a publicly traded R&D company worth over $4 billion. I created, expanded, and fixed issues with a Django-based GraphQL API and deployed it in the infrastructure of microservices hosted on AWS Cloud.

Languages

Python, SQL, JavaScript, CSS, HTML, TypeScript, PHP, GraphQL

Frameworks

Django, JSON Web Tokens (JWT), Django REST Framework

Libraries/APIs

REST APIs, API Development, jQuery, React

Tools

PyCharm, GitHub, Git, GitLab, Travis CI, Postman, Moodle

Paradigms

Back-end Architecture, Unit Testing, Agile Software Development, Agile, Scrum, REST, Microservices

Other

Web Development, APIs, Full-stack, IT, Data Engineering, Ajax, CI/CD Pipelines, Team Mentoring, Integration, Front-end, Software Development, Web Security, Scraping, Web Scraping, Data Scraping, Cloud Architecture, Architecture, IT Project Management, Law, Cordova, Scrum Master, Writing & Editing, Technical Writing

Platforms

MacOS, Linux, Amazon Web Services (AWS), WordPress

Storage

MySQL, PostgreSQL, MongoDB, SQLite

Industry Expertise

Network Security

2020 - 2021

Progress Toward a Bachelor's Degree in Law (LLB)

University College London (UCL) - London

JUNE 2022 - PRESENT

Professional Scrum Master (PSM1)

Scrum.org

MARCH 2022 - PRESENT

Professional Member of the British Computer Society (MBCS)

BCS, The Chartered Institute for IT

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