kjaniszewski
Krzysztof Janiszewski
Wielka Nieszawka, Poland

Experienced Fullstack Developer with a demonstrated history of working in the information technology and services industry. Strong engineering professional skilled in Customer Service, PHP, JavaScript, Strategic Planning, Web Development, and Project Management.

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3,404.6
CodersRank Rank
Top 1%
Top 5
JavaScript
JavaScript
Developer
Poland
Top 5
PHP
PHP
Developer
Poland
Top 1
Svelte
Svelte
Developer
Poland
Highest experience points: 0 points,

0 activities in the last year

List your work history, including any contracts or internships
The Portfolio Collective
Aug 2021 - Mar 2025 (3 years 7 months)
Remote
Senior Fullstack Developer
I began my work as part of a small, two-person development team, and later assumed sole responsibility for the entire project. In this role, I have been in charge of introducing new features, performing housekeeping and maintenance tasks, assisting colleagues from other teams, fixing bugs, and optimizing performance. My efforts led to a remarkable 70% increase in page speed, an 80% boost in user engagement, and a 45% reduction in infrastructure maintenance costs. These achievements not only improved the overall user experience but also contributed significantly to the company’s efficiency and bottom line, demonstrating my capacity to deliver high-quality, scalable solutions under minimal supervision.
wordpress php ReactJS mysql gcp google cloud javascript kubernetes docker symfony ReactJS aws terraform rest api jenkins phpunit phpmyadmin elasticsearch php composer linux nginx ci/cd scss css composer bash gitlab
Centrum Psychiatrii i Psychoterapii COLLIGO
Sep 2020 - Mar 2025 (4 years 6 months)
Toruń, Kujawsko-pomorskie
CTO/COO at Centrum Psychiatrii i Psychoterapii COLLIGO
I was instrumental in building Colligo Center for Psychiatry and Psychotherapy from the ground up, handling a wide range of business, organizational, and IT responsibilities. Under my leadership, the company evolved from a small facility operating just four offices into a prominent local provider conducting tens of thousands of consultations per year, with locations in two different cities. By implementing IT solutions such as automated SMS reminders, appointment confirmations, and prepayment systems, I successfully reduced the patient no-show rate from 33% to 18%. In addition, I cut the administrative time required for manual confirmations by over 90%, enabling significant operational efficiencies without increasing headcount. These measures also streamlined reporting processes, allowing the business to make faster, more informed decisions.
svelte php javascript api android mysql chrome ajax rest api responsive design scss webpack json jquery npm sass xml axios oop symfony unit testing tdd phpunit php composer
SEOBUDDY
Nov 2017 - Aug 2021 (3 years 9 months)
Remote
CTO & Co-Founder
I served as the sole developer at SEOBuddy, where I conceptualized and built an innovative tool designed to empower business owners to manage their in-house SEO strategies with simple, assignable frameworks. My role required intensive integration with a variety of APIs and the analysis of vast amounts of data, ensuring the product’s robustness and scalability. The tool’s effectiveness and market appeal were validated through its successful sales on platforms such as Appsumo and similar channels, reflecting its strong reception in the competitive SaaS landscape.
php symfony mysql scss headless nodeJS api figma json paddle responsive design npm sass axios webpack ajax jquery

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