Stanislau Lisavy
Backend Developer
Building robust, scalable backend systems with clean architecture. Turning complex requirements into elegant solutions.
About Me
Passionate about building things that work at scale
Backend developer with a strong focus on building clean, maintainable, and high-performance systems. I enjoy working with distributed architectures, solving complex integration challenges, and continuously improving system design. I care deeply about code quality, testability, and delivering reliable software.
Backend Architecture
Designing resilient server-side systems with Kotlin and Spring Boot, following clean architecture principles.
Distributed Systems
Building microservice-based platforms with proper service isolation, fault tolerance, and data consistency.
System Integration
Integrating complex third-party systems — from FIX/FAST protocols to payment gateways and enterprise platforms.
Experience
Background and Key Projects
LLC Krainet
Backend Developer · July 2024 — Present
Securities Trading Platform
High-reliability platform for securities trading with real-time market data processing and order management.
- Integrated FIX/FAST protocol for real-time market data streaming with BCSE
- Designed high-throughput REST APIs for order execution and trading workflows
- Refactored core modules to improve scalability, latency, and fault tolerance
- Improved system observability and reliability in a high-load trading environment
Auto-Secured Loans Platform
End-to-end loan processing platform with complex financial workflows, automated document generation and multi-system integration.
- Architected multi-system integrations (Bitrix24 CRM, 1C via SFTP/SMB)
- Designed automated document generation pipeline (.odt → .pdf)
- Built microservices communication layer using REST and Kafka
- Improved deployment workflows and environment stability
- Engineered comprehensive unit and integration test suites (80%+ coverage)
- Applied advanced Mockito & MockK techniques (argument captors, slots, behavioral verification) to ensure business logic reliability and edge-case resilience
- Developed modular annuity payment calculation engine supporting multiple configurable calculators
- Built extensible calculator framework allowing dynamic strategy resolution via factory-based orchestration
- Encapsulated domain logic using Strategy, Composite, and Factory patterns for flexible financial calculations
Car Leasing
Enterprise-grade leasing platform with state-driven business processes and deep integration with Bitrix24 CRM for end-to-end process automation.
- Designed and maintained deep bidirectional integration with Bitrix24 CRM, synchronizing leads, contacts, and deal lifecycle states
- Designed and implemented complex business workflows using Spring StateMachine (states, guards, actions) to model leasing lifecycle processes
- Encapsulated domain logic using Strategy, Composite, and Factory patterns for flexible financial calculations
- Achieved 80%+ test coverage with comprehensive unit and integration testing
- Applied advanced Mockito & MockK techniques (argument captors, slots, behavioral verification) to validate business state transitions and financial logic
- Designed and implemented advanced logging pattern using BeanPostProcessor to create Proxies for put MDC
Skills
Technologies and tools I work with
Backend
DevOps
Databases
Architecture & Principles
Education
Academic background
Belarusian State University of Informatics and Radioelectronics
Bachelor's Degree
2022 — 2026
Languages
Communication skills