Jan Kowalski

About

Hello, I'm Jan Kowalski.
With Bachelor's degree in software engineering & 10+ years experience from software internship to lead engineer, if you'd like, I'm ready to go up with your business. I've done 25+ jobs full-time or part-time so far.
Especially, As a team-leader I've built AFF(Assistant For Freelancer), with my 6 global colleagues. Using this freelancer-support environment, we(myself & 6 colleagues) became better to get success in freelancing through freely-sharing experience, skills and information one another.
How shall I support you?

Software lead / senior developer

Degree: Bachelor of science
Experience: 10+ years
Jobs: 25+

English: Fluent
Timezone: UTC + 01:00

Skills

I've been versed at dev & management in various of software fields such as:

Full stack Web 95%

Mobile 95%

Cross-platform App 85%

driver/kernel55%

AI 85%

Database administration 92%

Smart contract 87%

My skillful Technologies, languages, libraries and frameworks are:

Javascript | 99%

Typescript | 80%

PHP | 99%

HTML | 98%

CSS | 95%

Java | 75%

C/C++/C# | 95%

S Solidity | 90%

R Rust | 73%

Go | 55%

Python | 85%

React | 95%

Vue | 85%

Angular | 70%

S Svelte | 45%

L Laravel | 95%

Unity | 65%

Sass | 98%

3 Web3 | 73%

Wordpress | 95%

Shopify | 67%

E Express | 98%

B Bun.js | 72%

E Electron | 91%

Django | 81%

PostgreSQL | 72%

M MySQL | 83%

MongoDB | 98%

Resume

Experienced software developer with 6+ years proficient in many platforms and tools, focused on delivering business value through quality software. I am equally comfortable discussing requirements in the language of the business as I am in heads-down coding sprints. I can take hard problems from conception to production, designing the big picture and sweating the details. A lively debater around the planning table and a passionate, agile collaborator, I understand that the team succeeds together. I love creating distributed systems, prototyping with new technology, and automating the tedious. I have an intellectual curiosity that fuels a fanatical devotion to skills improvement and constant learning. Adept at collaborating with cross-functional teams to implement security measures and optimize web application performance.

Let me introduce my career in detail following:

Freelance

May 2022 - Present

Senior Full Stack Developer

Sapien

January 2021 - May 2022

Full Stack Developer

Chaintope

May 2020 - January 2021

Senior React Native Developer

Q.ai

September 2019 - May 2020

Full Stack Developer

Bella Football

April 2018 - September 2019

Front-End Developer

Angry Nerds

September 2017 - April 2018

Services

As a challenged / dedicated freelancer I am ready to contribute to your business in every software progress.
Even though I'm in GMT+1, Poland, I feel being able to work in any timezone with 6 global colleagues' technical and overtime supports through AFF service.
In Agile methodology and punctual manner I've delivered all my jobs in time, and I'll surely do so in the future. Of course, For your goal, I am prepared to work from scratch or maintenance either.
The most important point I concern is the best quality and maintenancible so I always keep "The solution first, the action next". Being ready in both of working alone and as a team member, I am experienced at developer to leader, including database administrator and technical consultant in english fluently.
In addition, since I've decent relationship with various software experts (6+ global colleagues), I feel confident to satisfy to you through sharing situation and solution one another. Oh, we're permenently growing our skills through metting 2-3 times a month in AFF.
How do you think of? No failure in trusting me!

Portfolio

I joined 25+ software projects with responsibilities from developer to leader for 6+ years. 5 I led, and completed 8 as a freelancer.
Here It's revealed most valuable 10 products, following.