Данил

Danil Kostin
Address: Tbilisi, Georgia Phone: [open contact info](look above in the "contact info" section) Email: [open contact info](look above in the "contact info" section)
GitHub: https://github.com/codememory1 Telegram: @danilcm
LinkedIn: [open contact info](look above in the "contact info" section)

About me
Senior Full-Stack Developer with 5+ years of commercial experience building high-load fintech platforms and business-
critical systems using PHP and Symfony. Experienced in designing scalable architectures, developing complex financial
workflows, and collaborating with cross-functional teams to deliver reliable software. Strong focus on Domain-Driven
Design (DDD), CQRS, and long-term maintainability.

Skills
PHP Golang Symfony PostgreSQL
RabbitMQ Redis Docker Laravel
REST API Microservices High-Load Systems Software Architecture
Vue.js Nuxt.js TypeScript Linux
Git

Work experience
11/2022 – 04/2026 Senior Full-Stack Developer
Tbilisi, Georgia Confidential Fintech Company

• Designed and implemented batch transaction processing, automatically grouping orders
based on a set of criteria, reducing transaction fees by tens of times.

• Redesigned the fund reservation architecture, reducing the asset lock time during order
creation from approximately 1 hour to 2 minutes.

• Developed an adaptive network fee calculation algorithm based on network analysis,
eliminating stuck transactions during periods of high network congestion.

• Designed and implemented a cryptocurrency deposit infrastructure with automatic
deposit address generation, blockchain monitoring, and secure balance crediting.

• Developed an internal financial reconciliation mechanism that automatically detects
discrepancies between partner balances, orders, and blockchain transactions.

• Solved concurrency issues in financial workflows, ensuring data consistency under high
transactional load.
02/2023 – 04/2023 Middle Full-Stack Developer
Chisinau, Moldova BPay SRL

• Developed an internal automated reporting microservice for administrators with
configurable templates and scheduled email delivery.

• Implemented support for additional report data sources, including SQL queries and PHP-
based data providers.

• Developed a custom data source provider using Symfony Expression Language, enabling
administrators to configure report data retrieval through controlled expressions.

• Refactored key components of the reporting microservice, improving maintainability and
simplifying future development.
01/2022 – 09/2022 Middle Backend Developer
Remote Code Pilots
 Work experience
• Solved event delivery and ordering issues in the auction platform by implementing the
Outbox Pattern and RabbitMQ message routing, ensuring reliable and sequential event
processing for each auction.

• Developed an audit logging system for administrative actions, recording entity changes,
performed operations, and related metadata.

• Implemented image upload to Amazon S3 with crop support using the Imagine library.

• Improved auction business logic by fixing critical issues in bid processing, auction lifecycle
management, and lot validation.

• Developed automated notifications and bulk messaging features for both users and
administrators.

• Implemented user authentication with Google OAuth 2.0.

• Refactored key components of the project, reducing code duplication and simplifying
future system development.

Education
09/2018 – 06/2022 Automotive Engineering | Technical Diploma
Mariupol, Ukraine Mariupol Construction Technical College

Languages
Russian Ukrainian English
Native Native Elementary