Stanislaw

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…

About

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.

💡 Why Clients Hire Me on Upwork
Proven Experience – Worked with 10+ startups from idea stage to successful launch & scaling.

Full-Cycle Delivery – From product planning and architecture to deployment and post-launch support.

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

Clear Communication – I provide proactive updates, quick responses, and crystal-clear documentation.

🛠 Core Skills & Tech Stack
🔹 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

🔹 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

🔹 Mobile Development
React Native, Expo, Flutter (Dart)

🔹 Cloud & DevOps
AWS, GCP, Azure, Heroku, Vercel, Netlify

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

Monitoring: Prometheus, Grafana, Sentry, ELK Stack

🔹 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

🔄 Development Workflow
Version Control: GitHub, GitLab, Bitbucket

Agile Tools: Jira, Trello, Slack, ClickUp

Testing: Jest, Cypress, PyTest, Mocha, Postman

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

📈 Let’s Build Your Next Big Success

📩 Message me now and let’s discuss your project requirements.

  • Joined October 2025

Industry experience

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

Projects · 6

Burst Mode is an innovative AI-powered platform designed to revolutionize the photography experience. It enables users to create high-quality images such as professional headshots, product photos, and stylized content using advanced artificial intelligence.

  • AI Developer
  • AI Engineer
  • App Developer
  • +4

ConvoZen is an AI-powered chatbot platform designed for seamless customer interactions, automating responses and enhancing engagement with advanced conversational AI technology.

  • AI Engineer
  • Back-End Developer
  • Full Stack Developer

. An advanced AI-powered agent capable of autonomously browsing websites, filling out and submitting forms, and downloading documents such as PDFs, Word files, and spreadsheets. The agent should handle dynamic web content, manage logins and sessions, and intelligently solve or bypass CAPTCHAs where possible. The system will feature a user-friendly dashboard for configuring automation tasks, monitoring agent activity, viewing logs, and securely managing downloaded files.

  • AI Engineer
  • Back-End Developer
  • Front-End Developer

Personalized Health Insights Powered by Machine Learning Beyond generic fitness apps. Vital.ai analyzes biometric data, sleep patterns, and nutrition to create tailored wellness plans. No one-size-fits-all approaches. Help users track progress, predict health risks, and achieve long-term goals with adaptive AI recommendations.

  • AI Developer
  • AI Engineer
  • Front-End Developer

Developed an AI Chatbot and did internal AI Automation which was integrated with the CRM. The tool extracts structured data from internal knowledge base, and then provides assistance to people based on their need. Integrated seamlessly with CRM. This chatbot was used as a Plugin additional to the existing Slack Channel and GHL CRM system. Designed for performance across web and mobile, ensuring scalability and ease of use.

Fusion AI is a responsive, desktop-optimized dashboard built with Next.js, Tailwind CSS, and TypeScript. It integrates smart AI tools to streamline business insights and automate tasks. Designed for speed and clarity, Fusion AI provides a clean UI, interactive charts, and real-time data handling, perfect for startups and SaaS platforms looking to supercharge their decision-making with AI. Built with React.js and Next.js, this lovable website experience ensures seamless performance, scalability, and modern design for businesses aiming to grow faster.

  • AI Engineer
  • Full Stack Developer

Work experience

Senior Full Stack Engineer · Remote USOct 2021 – Aug 2025 · 3 yrs 11 mos

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.

Full Stack Engineer with AI/ML · RemoteJan 2017 – Apr 2021 · 4 yrs 4 mos

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 £200,000

Education

Bachelor's degree · University of Sacramento2012 – 2016

• Developed strong skills in data structures, algorithms, and backend development. • Built web apps using Node.js, Express, and PostgreSQL during senior year. • Took electives in artificial intelligence and database systems. •Participated in hackathons and research projects focused on scalable web architectures.

Certifications and awards

Service-Oriented Architecture2025

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 Specialization2025
Software Development Lifecycle Specialization2021 – 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.

Hire Stanislaw today

Post a job and invite Stanislaw, or contact them directly. No hidden commission.

Post a job