About Andrew
Java Backend Developer with over 9 years of experience in designing, developing, and scaling enterprise-grade backend systems. Proven expertise in Spring Boot, Spring MVC, Hibernate/JPA, RESTful microservices, and deep knowledge of relational (PostgreSQL, MySQL, SQL Server) and non-relational (MongoDB, Redis) databases.
Skilled in building secure, high-performance, and transaction-heavy applications. Familiar with CI/CD workflows, Docker, AWS, andAzuredeployments, with atrack record of optimizing application performance, ensuring system reliability, and improving development efficiency.
English
Native or bilingual
Remote only
Primarily works remotely
Experience
- MACAWJAVA BACKEND ENGINEERJune 2023 - Today (3 years)• Designed, developed, and deployed scalable microservices using Spring Boot, enabling the system to handle 50,000+ requests per minute with median response times under 150ms.• Implemented data access layers with Hibernate/JPA for PostgreSQL and MongoDB, eliminating SQL injection risks and resolving N+1 query inefficiencies, reducing reporting query latency from 10 seconds to under 1 second.• Developed asynchronous background processing with Spring Batch and Kafka, reliably processing 200,000+ background jobs per day, ensuring API responsiveness under heavy loads.• Integrated Redis caching for high-traffic endpoints, decreasing database load by 60% and reducing average response time from 500ms to 120ms, significantly improving user experience.• Enhanced CI/CD pipelines with Jenkins and GitHub Actions, cutting deployment cycles from two hours to 20 minutes and reducing release errors by 70%.• Deployed applications across AWS and Azure cloud environments, achieving 99.9% uptime Service Level Agreement.
- EVERYTHING TECH LIMITEDBACKEND ENGINEERFebruary 2019 - April 2023 (4 years and 2 months)• Developed and maintained enterprise applications using Java, Spring Framework, and Hibernate, supporting sustained traffic volumes of 20,000–30,000 requests per minute with stable <300ms response times.• Optimized relational database schemas and tuned complex queries (PostgreSQL, SQL Server), reducing reporting dashboard query times from 6 seconds to under 500ms, improving analyst efficiency.• Designed and implemented backend logic for transaction-heavy workflows, automating manual processes and improving operational efficiency by 35%.• Integrated Java microservices with Microsoft-based legacy systems, enabling seamless data synchronization across five mission-critical applications.• Established unit and integration testing practices with JUnit and Mockito, raising test coverage from 20% to 75% and reducing production defects by 40%.• Contributed to cloud deployment initiatives on Microsoft Azure, enabling weekly production releases and minimizing downtime during deployments.
- INITFORTHEBACKEND DEVELOPERSeptember 2015 - December 2018 (3 years and 3 months)• Developed RESTful APIs with Java Spring MVC and Hibernate ORM, providing reliable backend services capable ofhandling 15,000+ requests per minute with 99.5% availability.• Implemented secure authentication and authorization using Spring Security, strengthening system access control and reducing unauthorized access incidents by 90%.• Administered and optimized MySQL and MongoDB databases, improving query performance by 25–30% through schema enhancements and indexing strategies.• Collaborated with frontend teams to design API contracts and integration flows, reducing rework by 50% and accelerating product delivery cycles.• Optimized reporting pipelines and queries, cutting reporting latency from 3 seconds to under 300ms, enabling near real-time analytics.
Recommendations
Be the first to recommend Andrew
Help this freelancer shine by sharing your experience working together.
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- MASTER OF SCIENCETHE UNIVERSITY OF MANCHESTER2015MASTER OF SCIENCE
- BACHELOR OF SCIENCETHE UNIVERSITY OF MANCHESTER2013BACHELOR OF SCIENCE