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Данил Костин
Open to opportunities

Данил Костин

@0005601

I build scalable PHP/Symfony fintech systems, from blockchain workflows to reliable financial operations.

Ukraine
Message

I've built high-load fintech systems, including blockchain transaction batching that reduced network fees by more than 10x and fund reservation workflows that cut asset lock time from about one hour to two minutes.

At a confidential fintech company, I developed cryptocurrency deposit infrastructure, reconciliation tooling, adaptive network fee calculations, and an AI chat agent integrated with the OpenAI API. I also delivered a support platform with real-time chat, Amazon S3 uploads, department routing, and order-management actions.

Previously at BPay SRL, I improved report parameter validation, built asynchronous reporting with Symfony Messenger and RabbitMQ, and added scheduled email reports and PHP-script data sources.

At Code Pilots, I delivered subscription and paid-access capabilities, administrator auditing, image processing, OAuth 2.0 authentication, and auction notifications. I focus on DDD, CQRS, event-driven architecture, and maintainable PHP/Symfony services.

Experience

Work history, roles, and key accomplishments

Education

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MC

Mariupol Construction Technical College

Technical Diploma, Automotive Engineering

2018 - 2022

Pursued a Technical Diploma in Automotive Engineering, gaining foundational knowledge in engineering principles and technical skills.

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