Michal Kowalik
@michalkowalik1
Seasoned Senior Full Stack Engineer with expertise in scalable systems.
What I'm looking for
As a Senior Full Stack Developer with over 11 years of experience, I specialize in driving scalable and secure backend systems. My expertise lies in Python (Django, FastAPI), PHP, and AWS serverless architecture, complemented by strong frontend skills in React and TypeScript. I have a proven track record of architecting distributed systems and enhancing DevOps pipelines, which has significantly improved observability for enterprise-grade applications.
Throughout my career, I have collaborated with cross-functional Agile teams to deliver impactful software solutions. My recent role at The Stepstone Group involved leading the design and deployment of real-time data enrichment APIs, which improved investor engagement by 25%. I am passionate about mentoring junior engineers and fostering a strong engineering culture, as evidenced by my efforts to increase TypeScript coverage across core platform services.
Experience
Work history, roles, and key accomplishments
Senior Software Engineer
The Stepstone Group
Sep 2024 - Present (10 months)
Led the design and deployment of real-time data enrichment APIs, delivering sub-100 ms response times for portfolio intelligence, investor dashboards, and analytics pipelines across web and mobile platforms used by 500+ institutional clients. Automated CI/CD pipelines using GitHub Actions and Bitrise, integrating TypeScript linting and test coverage gates (Jest), and streamlining release cycles wi
Senior Fullstack Developer
Nielsen
Jul 2022 - Present (3 years)
Built modular microservices in Python to support real-time audience tracking, metadata enrichment, and operational analytics across digital and linear platforms. Developed NLP-based classification and semantic search models with LangChain and OpenAI to categorize content, detect genre overlap, and enhance media taxonomy—deployed via FastAPI for sub-200 ms inference latency.
Senior Software Engineer
StepStone Services
Aug 2018 - Present (6 years 11 months)
Developed Node.js-based internal tooling to simulate API load patterns, validate performance under institutional investor traffic, and audit usage across portfolio analytics services. Engineered automated validation frameworks for regression detection and contract testing across high-volume REST and GraphQL endpoints, ensuring data integrity in investor reporting workflows.
Full Stack Developer
Grupa Absolvent.pl
Mar 2017 - Present (8 years 4 months)
Developed access control microservices in Python and Node.js to manage user permissions, session integrity, and device-based authentication across recruitment and event platforms. Maintained AWS-hosted infrastructure (S3, Cognito, Lambda, IAM) to securely handle applicant data, job board access, and employer platform integrations.
PHP Developer
Netinteractive sp. z o.o.
Aug 2016 - Present (8 years 11 months)
Contributed to REST API development and legacy modernization using Symfony and Next.js, enhancing backend compatibility and performance for digital marketing solutions. Developed integration test harnesses and QA scripts to validate API contracts and maintain system stability across campaign management and user engagement features.
PHP Programmer
Connectmedica
Apr 2016 - Present (9 years 3 months)
Developed and maintained interactive medical presentation platforms using Symfony and React, enabling pharmaceutical reps to deliver personalized, compliant content to healthcare professionals. Built backend services for session tracking, feedback collection, and dynamic content delivery, ensuring alignment with medical regulations and CRM integration requirements.
PHP Programmer
BanFi Group
Feb 2016 - Present (9 years 5 months)
Developed scalable property listing and client management systems using Laravel and JavaScript, supporting high-traffic real estate platforms and multi-channel marketing campaigns. Built responsive front-end components in React, enabling intuitive browsing experiences across desktop and mobile for prospective buyers and tenants.
PHP Programmer
R-Soft Studio
Oct 2015 - Present (9 years 9 months)
Designed and developed custom web applications using Laravel and JavaScript, catering to client-specific workflows across e-commerce, logistics, and B2B platforms. Built reusable UI components and interactive features using React, enabling responsive and user-friendly interfaces for diverse client use cases.
Frontend Developer
Artsaas
Jul 2015 - Present (10 years)
Developed and maintained backend systems in Laravel for managing artwork inventory, gallery records, and sales workflows, ensuring scalability and reliability across multi-user art platforms. Built dynamic frontends with JavaScript and jQuery, delivering responsive interfaces for collection browsing, exhibition scheduling, and private viewing experiences.
PHP Programmer
Select Sp. z o.o.
Nov 2014 - Present (10 years 8 months)
Developed and optimized e-commerce platforms using Laravel and React, enhancing performance, mobile responsiveness, and sales funnel effectiveness across high-traffic storefronts. Implemented custom modules for product management, discount engines, and checkout flows, streamlining operations and improving conversion rates for B2C and B2B customers.
Web Developer
Netkata Interactive Agency
Mar 2014 - Present (11 years 4 months)
Implemented CMS integrations and modular content blocks, enabling marketing teams to manage landing pages, campaign assets, and multilingual content with ease. Built responsive UI components and dynamic interactions, ensuring pixel-perfect execution across devices and accessibility standards for diverse audiences.
PHP Programmer
Imaginalis
Sep 2013 - Present (11 years 10 months)
Developed immersive, content-rich websites using WordPress and JavaScript blending performance with storytelling to support digital campaigns and brand activations. Created custom themes and plugins to support client-specific content flows, animation sequences, and interactive media elements across landing pages and digital portfolios.
Education
Degrees, certifications, and relevant coursework
Wroclaw University of Science and Technology
Bachelor of Computer Science, Computer Science
Studied computer science principles and practices. Gained foundational knowledge in various computing disciplines.
Tech stack
Software and tools used professionally
Apache Spark
GitHub
Kubernetes
Docker Compose
Jenkins
GitHub Actions
MySQL
PostgreSQL
MongoDB
Microsoft SQL Server
Hadoop
Gmail
Node.js
Django
Laravel
.NET Core
Next.js
Symfony
.NET
ASP.NET Core
Tailwind CSS
Figma
Redis
Terraform
jQuery
JavaScript
HTML5
Java
PHP
ASP.NET
JSON
TensorFlow
scikit-learn
Kafka
RabbitMQ
FastAPI
Grafana
Kibana
Prometheus
Linux
Windows
New Relic
GraphQL
gRPC
WordPress
AWS Lambda
Serverless
NGINX
Airflow
Root Cause
Storefronts
SQL
Loggly
Bitrise
Availability
Location
Authorized to work in
Job categories
Skills
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