Hleb Bandarenka
Verified Expert in Engineering
Software Developer
Vancouver, BC, Canada
Toptal member since February 21, 2025
Hleb is a senior software developer with 11+ years of experience building enterprise-scale applications at companies like Amazon and Wise. He builds high-performance back-end services using Java and TypeScript and leverages cloud technologies, like AWS and Azure, and distributed systems. Hleb's track record includes implementing cost-saving solutions, optimizing system performance, and mentoring teams while working with diverse architectures, from microservices to event-driven systems.
Portfolio
Experience
- RDBMS - 10 years
- Java - 8 years
- Spring Boot - 8 years
- Docker - 6 years
- Architecture - 5 years
- Apache Kafka - 3 years
- Node.js - 2 years
- GraphQL - 2 years
Preferred Environment
Java, Docker, Architecture, Amazon Web Services (AWS)
The most amazing...
...thing I've developed is a custom DSL at Amazon that significantly reduced deployment time and complexity while improving system reliability.
Work Experience
Senior Software Developer
Intelex
- Designed, led, and implemented the bulk import service, a critical component for future migration, including attachment migration functionality.
- Optimized the CI/CD pipeline that accelerated deployment and cut expenses.
- Established and implemented best practices for code reviews, streamlining the process to improve team productivity and code quality.
- Hosted a department-wide lunch-and-learn session, fostering knowledge sharing and informed decision-making.
Software Development Engineer 2
Amazon Web Services (AWS)
- Created a new DSL that simplified and speeded up changing feature flags.
- Integrated a rate limiter in a storage service to protect the system from overloading.
- Performed load testing to identify bottlenecks in our system.
- Automated generating weekly operations tables to eliminate manual data gathering.
Senior Software Developer
Wise
- Implemented an exponential backoff algorithm, achieving $10,000 in monthly cost savings.
- Accelerated unit tests by 4x, improving development.
- Introduced a new form of testing known as "contract tests."
Experience
Bulk Import Service for Intelex
Education
Bachelor's Degree in Computer Science
Polotsk State University - Polotsk, Belarus
Certifications
Technical Leadership
Hard&Soft Skills
Apollo Certified Graph Developer – Professional
Apollo Graph Inc.
AWS Certified Developer – Associate
Amazon Web Services
Confluent Certified Developer for Apache Kafka
Confluent
AWS Certified Solutions Architect – Associate
Amazon Web Services
Oracle Certified Expert, Java EE 6 Web Services Developer
Oracle
Certified Spring Professional v5.0
Pivotal
Oracle Certified Expert, Java EE 6 Java Persistence API Developer
Oracle
Oracle Certified Expert, Java EE 6 Web Component Developer
Oracle
Oracle Certified Professional, Java SE 8 Programmer
Oracle
Oracle Certified Associate, Java SE 8 Programmer
Oracle
Skills
Libraries/APIs
API Development, Node.js, React
Tools
Git, AWS IAM, Jira, Auth0, Kafka Connect, Google Sheets
Languages
Java, SQL, Bash, TypeScript, JavaScript, GraphQL, Python
Frameworks
Spring Boot, JSON Web Tokens (JWT), Spring MVC, Google Guice, Spring Microservice, Express.js, Spring Security, Spring 5, Next.js
Paradigms
Object-relational Mapping (ORM), Test-driven Development (TDD), Microservices
Platforms
AWS Lambda, AWS Cloud Computing Services, Amazon EC2, Apache Kafka, Linux, MacOS, New Relic, Amazon Web Services (AWS), Docker, Kubernetes, Azure
Storage
MySQL, NoSQL, RDBMS, PostgreSQL, Amazon S3 (AWS S3), Amazon DynamoDB, MongoDB
Other
Computer Science, Technical Leadership, Software as a Service (SaaS), Back-end, API Integration, APIs, RESTFul APIs, Back-end Development, Octopus Deploy, Cloud Architecture, Cloud Infrastructure, Cloud, Architecture, Financials, Leadership
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