John – Python, React, AWS

A company that provides custom software development and systems integration for SMEs across Europe.

• Built a scalable eBay listings management system handling 10k+ products with dynamic pricing algorithms, increasing client revenue by 25% - Hosted on AWS.
• Developed Bluetooth dongle GUI using C++ with Python wrapper (PyQt) for reading temperature sensors from IoT devices.
• Created a restaurant booking system with React frontend and Python backend, managing reservations and customer data.
• Refactored legacy codebases for multiple clients, identifying and eliminating wasteful API usage, saving one client $10k/month.
• Implemented full-stack solutions including backend services, frontend interfaces, database design, and third-party integrations.
• Established development best practices, Git workflows, and documentation standards for client development teams.
• Provided ongoing consulting on cloud migration strategies, reducing infrastructure costs by 30% while improving scalability.

A fintech platform that tokenises carbon credits on blockchain, enabling investors to trade environmental assets like traditional securities. The platform integrates traditional banking rails through Plaid and Stripe to bridge fiat currency with blockchain-based carbon credit tokens.

• Architected scalable microservices architecture using Python FastAPI and React, reducing system complexity by 40% and improving maintainability.
• Established comprehensive CI/CD pipelines with automated testing, code quality gates, and deployment strategies, reducing release cycles from weeks to days.
• Mentored 3 Mid-Junior developers on best practices, including code reviews, testing strategies, and Git workflow standards.
• Implemented a secure authentication system with JWT tokens and role-based access control, ensuring GDPR compliance for financial data.
• Built real-time data synchronization with multiple carbon credit registries using event-driven architecture and message queues.
• Designed and deployed infrastructure on AWS, achieving 99.9% uptime and auto-scaling capabilities.

A decentralised marketplace for buying, selling, and trading Non-Fungible Tokens (NFTs). Built on the Seaport protocol, the platform enables creators to mint digital assets and collectors to trade them securely with optimised gas costs and IPFS-based permanent storage.

• Architected core marketplace infrastructure using Seaport protocol, handling thousands of NFT transactions with 99.8% uptime.
• Designed and developed a complete innovative contract system for NFT trading, minting, and listing with advanced assembly-based gas optimisations, reducing transaction costs by 35%.
• Built scalable backend API layer using Redis, Nginx, Laravel, and Python for marketplace functionality and third-party integrations.
• Led development team in implementing React-based frontend with Wagmi / Viem integration, establishing code standards and review processes.
• Implemented IPFS-based storage solution for NFT metadata, ensuring decentralized and permanent asset storage with AWS S3 buckets.
• Established comprehensive CI/CD pipelines with automated testing and deployment strategies.
• Utilised Foundry for smart contract testing and Hardhat for deployment strategies.
• Conducted security audits for smart contracts and platform components, identifying and resolving 10+ potential vulnerabilities.
• Implemented a monitoring and analytics dashboard tracking marketplace performance, user activity, and transaction metrics.

One of the world's largest glass manufacturers, with approximately a 15% global market share in automotive glass. One of their products is a digital platform that connects insurance companies, automotive glass repair garages, and professional fitters to process windshield and window damage claims for ~50,000 users across Europe.

• Designed and implemented infrastructure on Azure, connecting insurance companies, garages, and car fitters across multiple European markets. Rebuilt legacy call center into a modern case management system serving ~50,000 users across insurers, garages, and fitters, handling automotive glass replacement claims.
• Built a mobile app enabling garages to upload damage photos, track glass replacement progress, and coordinate with insurers in real-time.
• Architected microservices-based backend using C# and REST APIs, improving system responsiveness by 60% compared to the legacy platform.
• Implemented MicroStrategy BI solutions with ETL pipelines synchronizing data across Azure databases, enabling real-time operational dashboards.
• Mentored team of 5 analysts on BDD practices, test automation, and documentation standards, reducing post-release defects by 40%.
• Established Git-based development workflows and CI/CD pipelines, reducing deployment time from days to hours.
• Ensured GDPR compliance for handling sensitive customer and insurance data across the platform.

A global leader in smart sensors and telematics for tank containers used in chemical and food logistics. The platform tracks containers worldwide using embedded IoT sensors and manages the complete manufacturing lifecycle from component sourcing through compliance testing and customer delivery.

• Designed microservices architecture processing real-time data from embedded sensors (GPS, temperature, pressure) across thousands of containers globally.
• Built a complete component traceability system tracking GPS chips, SIM cards, and batteries through manufacturing, testing, and compliance certification.
• Architected integration with Odoo ERP, managing sales, repairs, logistics, wages, and time tracking for manufacturing operations.
• Implemented Docker-based microservices for batch tracking and compliance safety, ensuring regulatory adherence.
• Established CI/CD pipelines, reducing deployment cycles by 50% and enabling continuous delivery of features.
• Mentored development team through technical workshops on containerisation, API design, and microservices best practices.
• Delivered live data streaming capabilities enabling customers to monitor container conditions in real-time.