Open to opportunities

Andrey User

@andreyuser6

Message

Backend developer with 15+ years building scalable Java/Spring microservices and event-driven systems.

Israel

Message

What I'm looking for

I’m looking for a role where I can design scalable backend services in Java/Spring with microservices and event-driven architectures on AWS—where correctness under concurrency, performance, and clean engineering practices matter.

I’m a Backend Developer with 15+ years of software engineering experience, focused on building scalable, reliable backend systems with Java and Spring Boot. I design microservices and distributed, event-driven architectures, and I care deeply about transactional correctness, concurrency, data consistency, and performance optimization.

In my recent work, I designed a hybrid backend architecture combining modular services and dedicated microservices for payments, shipping, notifications, and asynchronous event processing. I built transactional order reservation workflows with state transitions and automatic expiration, and I decoupled services using AWS SNS, SQS, and Lambda while separating transactional workloads in PostgreSQL (RDS) from operational events in DynamoDB for scalability and isolation. Previously, I improved inventory processing from batch updates to near real-time transactional workflows using concurrency-safe database transactions and pessimistic locking, resolved deadlocks with consistent locking order and retry logic, and delivered measurable performance gains—such as reducing processing time by up to 40% in reporting and calculation workflows.

Experience

Work history, roles, and key accomplishments

Current

Backend Developer

Current

Optimadevs

Jan 2024 - Present (2 years 6 months)

Designed a hybrid backend architecture combining modular services and dedicated microservices for payments, shipping, notifications, and asynchronous event processing. Built transactional order reservation workflows and AWS-based event processing to improve scalability and data consistency under concurrent checkout workloads.

Microservices Event Driven Architecture AWS Lambda Asynchronous Concurrency DynamoDB

Backend Developer

Automation

Jan 2021 - Jan 2024 (3 years)

Redesigned inventory processing from batch updates to real-time transactional workflows, improving processing latency. Implemented concurrency-safe transaction processing with pessimistic locking, deadlock resolution, and atomic workflows to maintain consistency across inventory and financial data.

Database Transactions Pessimistic Locking Deadlock Resolution Retry Logic Atomic Transaction Workflows

Software Developer

Softline

Jan 2011 - Jan 2021 (10 years)

Improved performance of business-critical modules by refactoring legacy code and optimizing SQL queries for reporting and calculation workflows. Built automation for pricing and margin calculations and developed a budgeting tool for cost tracking and financial reporting across departments.

Performance Optimization Refactoring SQL Query Optimization Cost Tracking

Software Developer

ART Saterra

Jan 2006 - Jan 2011 (5 years)

Developed enterprise applications for business process automation for public sector organizations, including internal workflow automation across departments. Implemented integrations with external services such as Russian Post and built distributed data solutions for multi-location retail to ensure data consistency.

Enterprise Application Development Workflow Automation Russian Post Integration Multi Location Retail Data