Maksym – Symfony, React, PHP

It is a construction-tech US project with an AI-powered SOP and workflow management platform that systemizes construction company processes, improves field-team accountability, and provides real-time visibility into project operations for specialty trade contractors.

• Implemented a new guided onboarding and implementation-based registration flow, replacing self-serve sign-up as the primary customer entry point while preserving legacy onboarding for optional use;
• Integrated Stripe one-time payments and deposits to automatically provision company instances, grant immediate Pro access, and control subscription start dates independent of access;
• Added Zapier integration, enabling customers to connect Subtrak with 3,000+ third-party applications and automate cross-platform workflows, increasing platform extensibility without additional backend maintenance overhead;
• Optimized the admin users page by introducing pagination and refactoring the MySQL schema, reducing query execution time by ~60% and lowering database load under large user datasets.

US product company with media-tech and high-load products. It has more than 1 000 000 users. Where authors can upload videos and images for subscribers to view. It consists of old monolith code and new microservices sub-projects.

• Built a scalable AI Chatbot backend with Laravel and MySQL, including REST APIs, authentication, and optimized real-time message storage, supporting 100k+ users and thousands of daily interactions;
• Migrated legacy payment logic into a standalone PHP microservice with improved CI/CD workflows, reducing deployment time by 50% and improving maintainability and scalability;
• Optimized artist page performance by redesigning the database schema, adding indexes, and tuning queries, achieving up to 40% faster load times and reduced server load;
• Implemented a rich-text editor for the Admin Panel and integrated Google Analytics 4 across the product, reducing content management effort by 70% and improving analytics and conversion tracking capabilities.

Modular SaaS platform for automating lending and financial services. The system provides end-to-end solutions for credit scoring, borrower verification, payments, debt collection, and integrations with banks, payment providers, and CRM systems, enabling financial organizations to quickly launch and scale their operations.

• Developed and optimized high-load APIs for loan applications, credit scoring, payments, and borrower verification, reducing API response times by 35% through performance and query optimizations;
• Integrated 5+ external services, including credit bureaus, payment gateways (Fondy, Privat24, Tranzzo), and communication providers, expanding automation and reducing manual operations;
• Implemented asynchronous processing with RabbitMQ for notifications, payment workflows, and scoring requests, improving system stability and enabling reliable handling of thousands of concurrent requests.

It is a distributed system with a website, desktop, and mobile applications. The product can do everything from creating a sport event to counting how much time an athlete spent on track. The system was field-tested in an Enduro bike competition with more than 100 athleres.

• Built an application with JavaScript from scratch, enabling real-time event tracking for 1k+ athletes;
• Designed a scalable MongoDB schema for handling high-volume event and participant data;
• Implemented live results board with Socket.io, ensuring instant updates with latency under 1 second;
• Successfully deployed system at real-life Enduro competitions, receiving positive feedback from organizers and athletes.

An educational platform designed for Australian schools, supporting teachers in delivering lessons on topics such as relationships, sexual health, and mental wellbeing. Worked as the sole developer on the project, responsible for the full implementation and delivery.

• Developed and enhanced a lesson management platform, enabling teachers to independently create and manage lectures, interactive content, and educational materials, reducing support requests by 80%;
• Implemented an interactive game board and delivered a responsive front-end redesign with support for displays up to 4K resolution, improving student engagement and classroom accessibility;
• Refactored and upgraded admin panel CRUD functionality to improve maintainability and usability while successfully delivering the entire project as a solo developer with consistent on-time releases.