About Sainath
I am a backend-focused software engineer with 3+ years of experience building scalable, high-performance microservices for large-scale e-commerce platforms.
I specialize in Java and the Spring ecosystem (Spring Boot, Spring Data JPA) and have hands-on experience designing and optimizing REST APIs, data pipelines, and backend services that handle high traffic and large datasets.
In my professional experience, I have worked on:
Building and optimizing backend services that improved system performance and reduced API latency by up to 60%
Designing data-intensive features such as price recommendation systems, bulk processing tools, and catalog migration pipelines
Working with Kafka, Redis, Solr, PostgreSQL, and cloud-native tools like Docker, Kubernetes, and GCP
Writing clean, testable code with unit and integration tests using JUnit and Mockito
I am comfortable working in agile environments, collaborating with cross-functional teams, and participating in code reviews and architectural discussions.
I am currently looking for freelance or part-time backend projects involving API development, performance optimization, data processing, or system refactoring, where I can deliver reliable solutions and measurable business impact.
English
Native or bilingual
German
Basic
Can work on-site
Erlangen (up to 50km), Nuremberg (up to 50km), Munich (up to 40km)
Experience
- QuinBay TechnologiesSoftware EngineerDIGITAL AND ITJanuary 2023 - November 2025 (2 years and 10 months)Bengaluru, Karnataka, IndiaPart of the Seller’s Product Catalog team responsible for managing the seller platform of Blibli, one of Indonesia’s leading e-commerce platform (Blibli).Developed a Bulk Auto-Assignment feature that automatically assigned 60,000+ products within 30 minutes to reviewers, improving workflow efficiency by 40%.Built a price recommendation feature analyzing data from 10+ competitor websites, resulting in a 10% revenue increase for sellers.Executed a large-scale migration of 20,000 products and 900,000 location codes from 108 stores into a unified online catalog.Developed a data discrepancy resolution tool that corrected 100,000+ faulty product records, ensuring high data quality and consistency.Improved system performance and scalability by implementing in-memory caching using Caffeine and Redis, reducing API latency by 50–60% and increasing throughput for frequently accessed hierarchical data.Implemented delta re-indexing between Solr and the database to keep data synchronized and improve search accuracy.Developed a product video upload feature, increasing user engagement and driving revenue growth.
- QuinBay TechnologiesSoftware Engineer InternE-COMMERCEJanuary 2023 - February 2024 (1 year and 1 month)Bengaluru, Karnataka, IndiaMigrated the core application from Spring Boot v1.0 to v2.0, including dependency updates, configuration changes, and API adaptations, resulting in improved performance, stability, and security.Analyzed and resolved compatibility issues during the migration process and supported testing and deployment of the upgraded application.Refactored the product editing functionality with a focus on clean architecture and modular design to improve code readability, maintainability, and extensibility.Reduced technical debt by removing redundant logic, improving naming conventions, and simplifying complex code paths.Added and improved unit tests to ensure functional correctness and prevent regressions after refactoring.
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Education
- M.Sc.Friedrich-Alexander-Universit¨2027M.Sc.
- B.TechSRM Institute of Science and Technology2023B.Tech