# Alexey Tyshchenko - Senior Backend Engineer
Source: https://hello.cv/alexeytyshchenko
Moscow

## Links
- Email
- Phone

## About
Highly accomplished Senior Backend Engineer with 4.5+ years of expertise in designing and optimizing high-load, distributed systems within fintech and enterprise environments. Proven leader in performance optimization, data-intensive platforms, and ML-enabled solutions, consistently delivering significant improvements in latency, cost savings, and system reliability. Adept at leveraging advanced Java, cloud, and data technologies to build scalable and resilient architectures.

## Work
### Senior Java Backend Engineer | Sberbank Technology
Led the design and ownership of high-load backend architecture for critical file upload services, driving significant performance optimizations for search functionality and database efficiency.
- Designed and owned backend architecture for a high-load file upload service, handling files up to 100 MB and sustaining 1200 RPS with consistently low latency (≤350 ms).
- Implemented scalable backend services integrated with AWS S3, ensuring reliability through rigorous load testing and peak traffic validation.
- Optimized search functionality by combining quick and custom filters, reducing response time from 2.1 seconds to 320 milliseconds (6.6x faster).
- Improved p95 latency from 1480 ms to 210 ms and decreased database CPU usage by 40% for 10K active users.
### Senior Software Engineer | Raiffeisen Bank
Architected and integrated advanced data analytics and machine learning solutions, enhancing query performance and enabling real-time insights for critical business functions.
- Architected a reactive REST API using Spring WebFlux, effectively preventing thread exhaustion during long-running Trino queries under high concurrency.
- Developed a federated analytics layer over PostgreSQL and S3 with Trino, eliminating redundant ETL processes and maintaining low-latency data access.
- Integrated an LLM-driven natural language to SQL interface, implementing schema-aware prompt engineering and robust query sandboxing to enhance data accessibility.
- Owned end-to-end integration of an ML recommendation engine, designing efficient feature store access and inference APIs for real-time insights.
### Senior Java Developer | MTS Group
Drove significant performance and cost optimizations across Java applications and large-scale data pipelines, while providing technical leadership and mentorship.
- Optimized Java collection joins, reducing reward calculation time by 70% (from 1 minute to 20 seconds) and achieving $5K/year in CPU cost savings.
- Implemented a boolean-expression-based filtering engine, improving system performance by 23% and significantly reducing operational costs.
- Built large-scale ETL pipelines using Apache Spark, processing over 100 TB per job and reducing infrastructure costs by $8K/year.
- Designed a generic calculation schema service, which cut schema development time by 50% and streamlined data processing workflows.
- Led comprehensive code reviews and provided technical mentorship, fostering best practices and enhancing team capabilities.
### Java Engineer | Huawei
Developed critical components for network security emulation and high-performance packet forwarding, ensuring robust system functionality and successful production deployment.
- Developed and integrated critical components for a virtualized firewall (VFW) emulator, enabling comprehensive support for complex north-south and east-west traffic scenarios in network security testing.
- Designed and implemented a customizable TCP/UDP packet forwarding module, ensuring high reliability with 90% unit test coverage and successful deployment to production environments.
- Contributed to the full development lifecycle, from initial design to successful deployment, collaborating with cross-functional teams to integrate network solutions seamlessly.
- Engineered flexible and modular solutions for packet handling, enhancing system adaptability and future scalability for evolving network requirements.

## Education
### Moscow Aviation Institute (National Research University) | Electronic Systems

## Skills
### Programming Languages
Advanced
- Java (8/17)
- Python
### Backend & Frameworks
Advanced
- Spring Boot
- Spring Cloud
- Hibernate
- JPA
- MapStruct
- OpenFeign
- RESTful APIs
- Microservices
### Databases
Advanced
- PostgreSQL
- ClickHouse
- Redis
- Elasticsearch
- Trino
### Messaging & Data Processing
Advanced
- Kafka
- Apache Spark
- Apache Flink
### DevOps & Cloud
Advanced
- Docker
- Jenkins
- Kubernetes
- AWS
- S3
- Podman
### Testing & Quality
Advanced
- Junit
- Testcontainers
- Apache JMeter
### Security & Authentication
Advanced
- Keycloak
- OAuth
### API & Documentation
Advanced
- Swagger
- OpenAPI

## Source
Read this profile on Hello.cv: https://hello.cv/alexeytyshchenko
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