With 10+ years of hands-on industry experience and a proven track record of delivering 50+ successful projects for startups, SMEs, and enterprises, I bring a unique combination of deep technical expertise, business understanding, and creative problem-solving. Whether you need to build a scalable SaaS platform, migrate complex systems, develop an AI-powered application, or optimize an existing product, I deliver high-quality, secure, and future-proof solutions on time and within budget. ๐Ÿ’ก Why Clients Hire Me on Upwork Proven Experience โ€“ Worked with 10+ startups from idea stage to successful launch & scaling. Full-Cycle Delivery โ€“ From product planning and architecture to deployment and post-launch support. Cross-Domain Expertise โ€“ SaaS, Fintech, AI/ML, E-commerce, Healthcare, EdTech, and Real Estate. Clear Communication โ€“ I provide proactive updates, quick responses, and crystal-clear documentation. ๐Ÿ›  Core Skills & Tech Stack ๐Ÿ”น Backend Development Languages & Frameworks: Node.js (Express, NestJS), Python (Django, FastAPI, Flask), Ruby on Rails, PHP (Laravel) Databases: PostgreSQL, MySQL, MongoDB, Redis, SQLite APIs: REST, GraphQL, gRPC, WebSockets, Stripe, AWS, Firebase, Twilio integrations ๐Ÿ”น Frontend Development Frameworks: React.js, Next.js, Angular, Vue.js, Svelte Styling & UI: TypeScript, Tailwind CSS, Bootstrap, Material UI, Chakra UI, SCSS State Management: Redux, Context API, Recoil, Zustand ๐Ÿ”น Mobile Development React Native, Expo, Flutter (Dart) ๐Ÿ”น Cloud & DevOps AWS, GCP, Azure, Heroku, Vercel, Netlify Docker, Kubernetes, GitHub Actions, GitLab CI/CD, Jenkins Monitoring: Prometheus, Grafana, Sentry, ELK Stack ๐Ÿ”น AI / Machine Learning / Data Science Libraries & Tools: TensorFlow, PyTorch, Scikit-learn, OpenCV, Hugging Face, LangChain, GPT/OpenAI API Data Analytics: Pandas, NumPy, Matplotlib, PowerBI, Google BigQuery, Apache Spark NLP: spaCy, NLTK, RAG implementations ๐Ÿ”„ Development Workflow Version Control: GitHub, GitLab, Bitbucket Agile Tools: Jira, Trello, Slack, ClickUp Testing: Jest, Cypress, PyTest, Mocha, Postman ๐ŸŒŸ What You Can Expect โœ… Fast, clear, and responsive communication โœ… Scalable architecture with clean, maintainable code โœ… Security best practices implemented from day one โœ… Flexible engagement models, hourly or fixed-price ๐Ÿ“ˆ Letโ€™s Build Your Next Big Success ๐Ÿ“ฉ Message me now and letโ€™s discuss your project requirements.โ€ฆ

Stanislaw

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With 10+ years of hands-on industry experience and a proven track record of delivering 50+ successful projects for startups, SMEs, and enterprises, I bring a unique combination of deep technical expertise, business understanding, and creative problem-solving. Whether you need to build a scalable SaaS platform, migrate complex systems, develop an AI-powered application, or optimize an existing product, I deliver high-quality, secure, and future-proof solutions on time and within budget. ๐Ÿ’ก Why Clients Hire Me on Upwork Proven Experience โ€“ Worked with 10+ startups from idea stage to successful launch & scaling. Full-Cycle Delivery โ€“ From product planning and architecture to deployment and post-launch support. Cross-Domain Expertise โ€“ SaaS, Fintech, AI/ML, E-commerce, Healthcare, EdTech, and Real Estate. Clear Communication โ€“ I provide proactive updates, quick responses, and crystal-clear documentation. ๐Ÿ›  Core Skills & Tech Stack ๐Ÿ”น Backend Development Languages & Frameworks: Node.js (Express, NestJS), Python (Django, FastAPI, Flask), Ruby on Rails, PHP (Laravel) Databases: PostgreSQL, MySQL, MongoDB, Redis, SQLite APIs: REST, GraphQL, gRPC, WebSockets, Stripe, AWS, Firebase, Twilio integrations ๐Ÿ”น Frontend Development Frameworks: React.js, Next.js, Angular, Vue.js, Svelte Styling & UI: TypeScript, Tailwind CSS, Bootstrap, Material UI, Chakra UI, SCSS State Management: Redux, Context API, Recoil, Zustand ๐Ÿ”น Mobile Development React Native, Expo, Flutter (Dart) ๐Ÿ”น Cloud & DevOps AWS, GCP, Azure, Heroku, Vercel, Netlify Docker, Kubernetes, GitHub Actions, GitLab CI/CD, Jenkins Monitoring: Prometheus, Grafana, Sentry, ELK Stack ๐Ÿ”น AI / Machine Learning / Data Science Libraries & Tools: TensorFlow, PyTorch, Scikit-learn, OpenCV, Hugging Face, LangChain, GPT/OpenAI API Data Analytics: Pandas, NumPy, Matplotlib, PowerBI, Google BigQuery, Apache Spark NLP: spaCy, NLTK, RAG implementations ๐Ÿ”„ Development Workflow Version Control: GitHub, GitLab, Bitbucket Agile Tools: Jira, Trello, Slack, ClickUp Testing: Jest, Cypress, PyTest, Mocha, Postman ๐ŸŒŸ What You Can Expect โœ… Fast, clear, and responsive communication โœ… Scalable architecture with clean, maintainable code โœ… Security best practices implemented from day one โœ… Flexible engagement models, hourly or fixed-price ๐Ÿ“ˆ Letโ€™s Build Your Next Big Success ๐Ÿ“ฉ Message me now and letโ€™s discuss your project requirements.โ€ฆ

Available to hire

With 10+ years of hands-on industry experience and a proven track record of delivering 50+ successful projects for startups, SMEs, and enterprises, I bring a unique combination of deep technical expertise, business understanding, and creative problem-solving. Whether you need to build a scalable SaaS platform, migrate complex systems, develop an AI-powered application, or optimize an existing product, I deliver high-quality, secure, and future-proof solutions on time and within budget.

๐Ÿ’ก Why Clients Hire Me on Upwork
Proven Experience โ€“ Worked with 10+ startups from idea stage to successful launch & scaling.

Full-Cycle Delivery โ€“ From product planning and architecture to deployment and post-launch support.

Cross-Domain Expertise โ€“ SaaS, Fintech, AI/ML, E-commerce, Healthcare, EdTech, and Real Estate.

Clear Communication โ€“ I provide proactive updates, quick responses, and crystal-clear documentation.

๐Ÿ›  Core Skills & Tech Stack
๐Ÿ”น Backend Development
Languages & Frameworks: Node.js (Express, NestJS), Python (Django, FastAPI, Flask), Ruby on Rails, PHP (Laravel)

Databases: PostgreSQL, MySQL, MongoDB, Redis, SQLite

APIs: REST, GraphQL, gRPC, WebSockets, Stripe, AWS, Firebase, Twilio integrations

๐Ÿ”น Frontend Development
Frameworks: React.js, Next.js, Angular, Vue.js, Svelte

Styling & UI: TypeScript, Tailwind CSS, Bootstrap, Material UI, Chakra UI, SCSS

State Management: Redux, Context API, Recoil, Zustand

๐Ÿ”น Mobile Development
React Native, Expo, Flutter (Dart)

๐Ÿ”น Cloud & DevOps
AWS, GCP, Azure, Heroku, Vercel, Netlify

Docker, Kubernetes, GitHub Actions, GitLab CI/CD, Jenkins

Monitoring: Prometheus, Grafana, Sentry, ELK Stack

๐Ÿ”น AI / Machine Learning / Data Science
Libraries & Tools: TensorFlow, PyTorch, Scikit-learn, OpenCV, Hugging Face, LangChain, GPT/OpenAI API

Data Analytics: Pandas, NumPy, Matplotlib, PowerBI, Google BigQuery, Apache Spark

NLP: spaCy, NLTK, RAG implementations

๐Ÿ”„ Development Workflow
Version Control: GitHub, GitLab, Bitbucket

Agile Tools: Jira, Trello, Slack, ClickUp

Testing: Jest, Cypress, PyTest, Mocha, Postman

๐ŸŒŸ What You Can Expect
โœ… Fast, clear, and responsive communication
โœ… Scalable architecture with clean, maintainable code
โœ… Security best practices implemented from day one
โœ… Flexible engagement models, hourly or fixed-price

๐Ÿ“ˆ Letโ€™s Build Your Next Big Success

๐Ÿ“ฉ Message me now and letโ€™s discuss your project requirements.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
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Language

English
Fluent

Work Experience

Full Stack Engineer with AI/ML at Remote
January 9, 2017 - April 15, 2021
1. AI lead for V6 evaluator product, collaborating with cross-functional teams to optimize call routing outcomes. 2. Configured data lookups in the production environment, aligning with updated matching query from SME to improve data quality by 20%. 3. Automated model performance monitoring to dynamically update hyper parameters in production, as per the best practices in MLOps. 4. Demonstrated exceptional performance, achieving a 50% gain in revenue during this assignment, contributing a weekly sum around ยฃ200,000
Senior Full Stack Engineer at Remote US
October 13, 2021 - August 14, 2025
Collaborate closely with cross-functional teams including product managers, designers, data scientists, and QA engineers to deliver high-quality solutions on time. Develop and maintain responsive, accessible, and performant front-end interfaces using modern frameworks like React, Vue.js, Next and Angular .On Back-End Python, Node.JS. Ruby on Rails, Architect and optimize scalable back-end systems, databases (SQL & NoSQL), and cloud-based solutions ensuring security and reliability. Implement advanced AI/ML algorithms for predictive analytics, recommendation systems, natural language processing, and computer vision applications. Create automated data pipelines and ETL processes using tools such as Apache Spark, Airflow, and Pandas to support large-scale data processing. Conduct code reviews, mentor junior developers, and establish best practices for clean, maintainable, and efficient code. Utilize Agile methodologies to manage project workflows, sprints, and continuous delivery.

Education

Bachelor's degree at University of Sacramento
April 1, 2012 - October 14, 2016
โ€ข Developed strong skills in data structures, algorithms, and backend development. โ€ข Built web apps using Node.js, Express, and PostgreSQL during senior year. โ€ข Took electives in artificial intelligence and database systems. โ€ขParticipated in hackathons and research projects focused on scalable web architectures.

Qualifications

Service-Oriented Architecture
October 9, 2025 - October 9, 2025
This was valuable learning in terms of understanding how to design, develop, and deploy service-oriented architecture (SOA) systems, including an understanding of microservices, API design, service composition, and governance, enabling me to build scalable, flexible, and maintainable software systems.
Software Development Lifecycle Specialization
October 9, 2025 - October 9, 2025
Software Development Lifecycle Specialization
October 22, 2021 - October 21, 2022
I've gained a comprehensive understanding of the software development lifecycle, from planning to deployment, including design principles, testing strategies, and DevOps practices, making me a more well-rounded full-stack engineer.

Industry Experience

Healthcare, Financial Services, Retail, Other, Software & Internet, Computers & Electronics, Professional Services
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