Anton P.

I help founders and product teams turn ideas into secure, scalable products, and rescue existing ones that have outgrown their first version. With 8+ years of hands-on experience, I cover the full cycle: architecture, front end, back end, integrations, deployment and long-term maintenance. You get one senior engineer who understands the business side, makes sound technical decisions and ships working software. 🌐 INDUSTRIES I KNOW BEST FinTech · Crypto · E-commerce · Media & Creators · Health & Fitness · SaaS 💳 FINTECH & NEOBANKING I was a core engineer on Trastra, a multi-currency wallet and neobank platform. My work included: ✔ KYC/AML onboarding and identity verification flows ✔ Card issuing and Stripe Issuing integration ✔ Fraud detection and payout systems ✔ Crypto wallet, exchange and payment features ✔ Multi-factor authentication and role-based access Financial products leave no room for guesswork, so I design for security, audit trails and edge cases from day one. 🛒 E-COMMERCE & RETAIL On a long-term engagement with a global commerce platform, I worked on product functionality, performance optimisation, real-time content updates and authentication. I also built a best-price finder app with React and Node.js. 🎵 MEDIA & CREATOR PLATFORMS I developed Royalite, a SaaS web application built with React, Next.js and Node.js, covering dashboards, user accounts and data-heavy workflows. 💪 HEALTH & FITNESS Delivered web and mobile apps for a fitness brand using React, React Native, Node.js and MongoDB, including backend APIs and cross-platform clients. 🏢 SAAS & B2B PLATFORMS Multi-tenant architecture, subscription billing, admin dashboards, role-based permissions, third-party integrations and public APIs. I know what it takes to move an MVP to a product that handles real customers and real growth. 🛠 WHAT I CAN OWN FOR YOU ⚛️ Front end: React, Next.js, TypeScript, React Native 🟢 Back end: Node.js, Python, FastAPI, REST APIs 🗄 Data: PostgreSQL, MongoDB, schema design, query optimisation 🐳 DevOps: Docker, CI/CD pipelines, AWS deployment 🔐 Security: authentication, authorisation, secure payment flows 🔄 Legacy: migrations, refactoring, technical-debt reduction 🎯 TYPICAL PROJECTS • Building an MVP or new product from scratch • Adding payments, KYC or banking integrations to an existing app • Scaling a product that is slow, fragile or hard to change • Taking over a codebase from another team • Integrating third-party APIs and services 🧭 MY PROCESS 1️⃣ Discovery: we align on goals, scope and constraints 2️⃣ Plan: architecture, milestones and a clear estimate 3️⃣ Build: iterative delivery with regular demos 4️⃣ Launch & support: deployment, monitoring and handover 🤝 HOW I WORK 💬 Frequent updates, early risk flags, no surprises 🧼 Clean, tested, documented code your team can maintain ⏰ 30+ hrs/week, replies within 0-4 hours, open to contract-to-hire 🌍 Comfortable with global teams; I speak English, Ukrainian, Russian and Polish ⭐ WHY CLIENTS STAY Clients keep working with me for three reasons: I take ownership, I raise risks early, and I think about the product, not only the ticket. My 100% Job Success score and long-running contracts, including a 7+ year engagement, reflect that. 🧰 TECH STACK React · Next.js · Node.js · TypeScript · JavaScript · Python · FastAPI · PostgreSQL · MongoDB · Redux · Docker · CI/CD · AWS · Stripe · REST APIs 📩 Have a SaaS, FinTech or e-commerce product to build, scale or rescue? Send me a short message with your goals, timeline and current stack, and I'll reply with clear questions and a proposed plan. Let's build something reliable together.