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Ravi Ranjan

@raviranjan9

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Backend engineer at Mobilise App Lab Ltd who productionized an Azure GenAI/RAG platform and cut API latency by 30%.

India

Message

At Mobilise App Lab Ltd, I architected Java 17 and Spring Boot microservices and designed MySQL, MongoDB, and Redis data layers that reduced API latency by 30%. I also productionized an enterprise GenAI/RAG platform using Azure OpenAI and Azure AI Search.

Previously, I engineered an IoT telemetry backend for OxyGrid and developed a distributed RFID processing engine that handled 170,000+ daily unique transactions. At Liberin Technologies, I built Kafka-based audit logging and tracing and implemented enterprise identity and access controls using Keycloak and Microsoft Entra ID.

Experience

Work history, roles, and key accomplishments

Current

Project Manager - Backend Engineering

Current

Mobilise App Lab Ltd

Apr 2025 - Present (1 year 6 months)

Architected scalable microservices and distributed backend systems using Java 17 and Spring Boot. Led large-scale code refactoring, mentored engineers, and productionized an enterprise GenAI/RAG platform.

Java 17 Spring Boot MySQL MongoDB Redis Azure OpenAI Azure AI Search JUnit5 Mockito System Design Microservices Refactoring Mentorship

Senior Software Developer

Mobilise App Lab Ltd

Jun 2024 - Mar 2025 (9 months)

Engineered an end-to-end telemetry backend for medical oxygen plants and developed a distributed TCP-based RFID processing engine handling 170,000+ daily transactions. Automated deployment and testing pipelines with Docker, Git, and SonarQube.

Spring Boot MQTT Redis WebSockets MySQL Docker Git SonarQube TCP RFID CI CD

Senior Software Engineer

Liberin Technologies

Aug 2023 - Apr 2024 (8 months)

Designed LLD specifications and optimized WebSocket communication layers, boosting backend throughput by 25%. Built distributed audit logging with Kafka and Spring AOP, and implemented multi-tenant RBAC with Keycloak and Microsoft Entra ID.

WebSockets Kafka Spring AOP Keycloak Microsoft Entra ID OAuth OIDC SAML 2.0 RBAC System Design

Software Engineer

Liberin Technologies

Aug 2022 - Jul 2023 (11 months)

Developed 30+ enterprise RESTful APIs using Java, Spring Boot, and Hibernate/JPA. Diagnosed bottlenecks and optimized complex SQL queries and relational indexing across MySQL and Oracle DB instances.

Java Spring Boot Hibernate JPA REST APIs MySQL Oracle DB SQL Query Optimization

Backend Developer Intern

SharedPro Technologies

Apr 2022 - Jul 2022 (3 months)

Developed database scripts, built REST API endpoints in Java/Spring Boot, and wrote automated unit test suites using JUnit and Mockito. Maintained OpenAPI/Swagger documentation and participated in Agile ceremonies.