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USD 25 /hr

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Hire Anton S.

Poland

USD 25 /hr

Product-Focused Engineer | Data Analyst | Business-Driven System | 5+ Exp

Profile Summary

I build scalable products by solving the right business problems, not just delivering features.
👉 My career began as an Upwork client and team manager. That perspective shaped how I work today. I understand what causes projects to fail and what makes them succeed. Clear goals, structured communication, and systems designed for real users, not assumptions.
🥇 I specialize in turning ideas into production-ready web products using React and Python, with a focus on performance, maintainability, and long-term growth. Every decision is tied to business impact, not technical vanity.

🟢 What I Solve
✔ Startup MVP web apps (SaaS, marketplaces, booking platforms)
I build first versions of products using React on the frontend and Python on the backend, enhanced with OpenAI API where intelligent features are needed. Common setups include secure authentication, user roles, Stripe subscriptions, basic admin panels, and AI-assisted experiences driven by OpenAI API, all structured so your React and Python system can launch fast and scale confidently.

✔ Onboarding and workflow automation around payments and emails
I implement automation where React interfaces trigger Python services and OpenAI API logic to handle new sign ups, renewals, failed payments, and cancellations. Stripe events are processed through Python workflows, while OpenAI API supports smart messaging, email personalization, and consistent customer communication with minimal manual effort.

✔ API and service integrations centered on React, Python, and OpenAI API
I connect external services such as Stripe, Twilio, CRMs, phone systems, and scheduling tools into unified systems built with React, Python, and OpenAI API. This includes custom webhooks, data synchronization, event logging, and intelligent processing using OpenAI API to enhance automation quality and decision flows.

✔ Admin dashboards and analytics pages for SaaS products
I create internal dashboards and reporting pages that show key metrics through tables and charts. For example, usage analytics for a SaaS app, revenue and churn overview, or operations dashboards for internal teams, all built with React and a Python or API integration.

🟢 Selected Results
⭐️ I launched a React and Python-based startup platform that scaled to 5,000+ active users within 3 months, maintaining stable performance under real-world traffic.
⭐️ I automated core business workflows using Python and OpenAI API, reducing manual operational workload by 70% for internal teams.
⭐️ I optimized backend APIs and database queries, improving response speed by 60% and increasing overall system reliability under production load.
⭐️ I delivered complete MVP systems from concept to live deployment in 2 to 3 weeks, allowing founders to validate ideas and attract early users faster.

🟢 How I Work
Most developers focus on tasks. But I focus on outcomes.
I typically work in 2-3 day sprints on projects like this - build one module, you test it with real content, we adjust, move to the next.

🟢 Core Focus
Primary Stack: React.js, Python, PostgreSQL, OpenAI/Anthropic API, Lovable.dev, Claude Code, Docker, Ngnix

🟢 Ideal Clients
Startups and teams who value clear communication, product thinking, and scalable engineering. If you need a developer who understands your business and builds with purpose, we will work well together.

Let’s turn your idea into a system that performs, scales, and delivers results.💪

Subject Matter Expertise

Services

Data & AI

Data & AI Statistical Analysis, Image Processing, Image Analysis, Algorithm Design-ML, Data Processing

Work Experience

Business Analyst / Project Manager

Codelab Sp. z o.o

March 2022 - October 2025

Software Developer

SB Software Sp. z o.o.

June 2018 - October 2021

Education

Master's degree

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie

June 2010 - September 2014

Certifications

Certification details not provided.

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