09/15/2026 updated

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Senior Java Backend Engineer | Spring Boot | Microservices | REST APIs | AWS | Kafka | PostgreSQL

Pune, India
Only remote
B.E. Electronics & Telecommunication Engineering, Amravati University, 2009
Pune, India
Only remote
B.E. Electronics & Telecommunication Engineering, Amravati University, 2009

Profile attachments

Prasanna-Senior-Java-Backend-Engineer.pdf

About me

Senior Java Backend Engineer with 10+ years of hands-on Java/Spring experience building production APIs, microservices and data-intensive systems. Strong in Spring Boot, PostgreSQL, Kafka, AWS, testing and CI/CD. Available for remote B2B projects from India through Pashyaa Technologies Pvt. Ltd.

RAGOpenAIGCPJava (Programming Language)JavaScriptSpring SecurityApplication Programming Interfaces (APIs)Amazon Web ServicesHTML5GitHubHibernateSpring FrameworkJUnitPostgreSQLApache MavenMongoDBMySQLMockitoSwaggerSonarQubePL-SQLTypeScriptOpenapiCircleCISpring MVCReact.jsOracle 10g/11gSpring BootGitSpring DataBackend ProgrammingApache KafkaRestful ApiDockerJenkinsMicroservices
Java & Spring Backend Engineering
10+ years of hands-on experience building and maintaining Java/Spring applications, REST APIs, and microservices for enterprise systems. Strong with Java, Spring Boot, Spring Framework, Spring MVC, Spring Data JPA, Hibernate, Spring Security, WebFlux/Reactor, Flyway, Swagger/OpenAPI, and production troubleshooting.

Database Engineering & Performance
Strong experience with PostgreSQL, Oracle, MySQL, SQL/PLSQL, and pgvector. Skilled in schema design, transactions, query/index optimisation, stored procedures, migrations, and performance tuning for data-intensive applications.

Microservices, Messaging & Integration
Hands-on experience designing REST-based microservices and asynchronous/event-driven integrations using Apache Kafka and AWS SQS. Experience integrating third-party services through REST/JSON and SOAP/XML.

Cloud, Containers & CI/CD
Hands-on experience with AWS services including Lambda, API Gateway, S3, Cognito, CloudFront, DynamoDB, CloudWatch, and IAM, plus GCP App Engine and Cloud SQL. Skilled with Docker, GitHub Actions, Jenkins, GitLab CI, CircleCI, Maven, Gradle, and SonarQube.

Testing, Quality & Observability
Proficient with JUnit 5, Mockito, Testcontainers, unit/integration/regression testing, Spring Boot Actuator, Kibana, structured logging, debugging, and production diagnostics.

Security
Experience with Spring Security, JWT/RBAC, authentication and authorisation, input validation, CORS, SQL-injection remediation, secure API design, and dependency/security fixes.

Frontend
Practical full-stack experience with React.js, TypeScript, JavaScript, Material UI, Redux, Axios, HTML5, and CSS3, including integration with backend REST APIs.

AI / RAG Integration
Recent experience implementing Java-based LLM/RAG workflows using Spring AI, PostgreSQL/pgvector, OpenAI API, embeddings, vector retrieval, grounded responses, and streaming APIs.

Experience

Professional experience10+ years
Freelancer since2020

Languages

EnglishFluentHindiFluent

Project history

Senior Java Full-Stack Developer – InfoYog

Pashyaa Technologies

Internet & IT

< 10 team member

Built and operate a production web/mobile AI assistant providing authenticated chat, multilingual support, conversation history and grounded AI responses.

• Developed Java 21 / Spring Boot APIs, authentication and PostgreSQL persistence.
• Implemented WebFlux / Server-Sent Events for streaming responses.
• Built RAG workflows using document chunking, embeddings, PostgreSQL/pgvector, HNSW retrieval, reranking and grounded LLM responses.
• Added Flyway migrations, Testcontainers integration testing, scheduled jobs and rate limiting.
• Implemented Docker-based deployment and controlled deployment workflows on Google Cloud.

Tech: Java 21, Spring Boot 3.x, PostgreSQL, pgvector, Spring AI, OpenAI API, WebFlux, Docker, Testcontainers, GCP.

Java Full-Stack Developer – ARCO Compliance

Pashyaa Technologies

Auditing, Taxes & Law

< 10 team member

Worked on an enterprise VAT compliance and reporting platform processing financial transaction data from SAP systems.

• Developed Java/Spring Boot microservices and REST APIs for VAT-compliance workflows.
• Built scheduled calculation services using JPA/PostgreSQL and versioned JSON business rules.
• Improved transaction-processing performance through SQL, query and data-access optimisation.
• Implemented JWT/RBAC security, Flyway database migrations and automated testing with JUnit.
• Supported production diagnostics and troubleshooting using Kibana and Spring Boot Actuator.

Tech: Java, Spring Boot, Microservices, PostgreSQL, JPA/Hibernate, REST APIs, Flyway, JUnit, Kibana.

Java Full-Stack Developer – CVS Caremark

Pashyaa Technologies

Pharmaceuticals & Medical Technology

< 10 team member

Worked on an enterprise pharmacy-benefit-management platform supporting member benefits, prescriptions, pharmacy claims and pharmacy-service workflows.

• Developed Spring Boot microservices and REST APIs for healthcare and pharmacy workflows.
• Implemented Spring Kafka consumer listeners for asynchronous pharmacy-claim processing and state synchronisation in MySQL.
• Worked with Spring Security/JWT and third-party API integrations.
• Implemented JUnit tests and supported production defect resolution, deployments and code reviews.
• Contributed to React.js integration and data-access performance improvements.

Tech: Java 8, Spring Boot, Microservices, REST APIs, React.js, MySQL, Kafka, Spring Security, JUnit, Jenkins.

Full-Stack Developer – PartnerConnect

Pashyaa Technologies

Internet & IT

< 10 team member

Worked on a B2B/B2C service portal delivering online services to retailers, partners and farmers across web, Android, iOS and desktop channels.

• Designed and developed Spring Boot REST APIs consumed by multiple client applications.
• Integrated third-party services and backend business workflows.
• Implemented automated testing using JUnit/H2.
• Supported application monitoring with Spring Boot Actuator.
• Worked on SonarQube remediation, CI/CD, code reviews, production readiness and defect resolution.

Tech: Java 8, Spring Boot, REST APIs, PostgreSQL, JUnit, H2, Gradle, SonarQube, Actuator, CircleCI.

Senior Full-Stack Developer – TrainingApp

Pashyaa Technologies

Internet & IT

< 10 team member

Developed a serverless learning platform where users could browse and purchase courses, access documents and video tutorials, and schedule personalised online training sessions.

• Built React.js components using Material UI, Redux and Axios.
• Integrated the frontend with REST APIs implemented through AWS API Gateway and Lambda.
• Implemented AWS SAM / CloudFormation infrastructure.
• Configured Cognito authentication, DynamoDB persistence, S3 storage and CloudFront content delivery.
• Supported deployment, testing and troubleshooting.

Tech: React.js, JavaScript, Material UI, Redux, Axios, AWS Lambda, API Gateway, DynamoDB, S3, Cognito, CloudFront, AWS SAM.

Technical Lead – FAEM

Wipro

Banking & Financial Services

>10.000 team member

Worked on financial-reporting adjustment and journal-entry workflows across banking products.

• Developed enterprise functionality using Java, Spring REST services and Oracle.
• Worked extensively with SQL, PL/SQL, stored procedures and database views.
• Improved high-volume adjustment and reporting performance by optimising complex SQL, stored procedures, views and targeted indexes.
• Handled estimation, feature delivery, code reviews and defect resolution.
• Supported deployments, releases and production stabilisation.

Tech: Java, Spring REST, Oracle, SQL/PLSQL, stored procedures, ExtJS.

Consultant – Smart Investor AO

Capgemini

Banking & Financial Services

>10.000 team member

Worked on a banking/direct-investing account-opening platform integrating multiple internal and third-party services.

• Developed Java/Spring functionality for account-opening and investment workflows.
• Implemented and maintained REST and SOAP integrations with third-party services.
• Worked on backend business logic, validation and integration flows.
• Resolved application-security findings including SQL injection, CORS configuration and URL/input encoding issues.
• Supported testing, releases, deployment activities and production delivery.

Tech: Java, Spring, REST APIs, SOAP/XML, Jenkins, SQL, application security.

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