Headline

Backend Engineer @ Boomerang | Java | Spring Boot | Node.js | AWS | gRPC | Apache Beam | Flink | Distributed Systems | Event-Driven Architecture

About

I'm a Backend Engineer at Boomerang, building AI-powered sales intelligence platforms that process millions of records daily. As one of the founding engineers, I’ve architected our entire microservices ecosystem from the ground up — scaling it from zero to production-level reliability and performance. I specialize in building enterprise-scale GraphQL APIs and reactive microservices using Spring Boot 3.x, Java 21, and cloud-native architectures. My focus lies in designing high-performance distributed systems that handle complex integrations — from orchestrating 50+ gRPC services with Camunda BPM to powering real-time CRM syncs across Salesforce, HubSpot, and SalesLoft. 🧠 Recent Highlights: Reduced query latency by 40% using DataLoader patterns and Redis caching. Built AI-powered data enrichment features using OpenAI GPT-4 and Azure AI, achieving 95%+ enrichment accuracy. Led initiatives to improve observability and reliability across distributed systems using OpenTelemetry and Kubernetes. 💡 I’m passionate about solving distributed systems challenges, optimizing performance, and leveraging AI to automate complex workflows. Tech Stack: Java 21 · Spring Boot / WebFlux · GraphQL · TypeScript · Kubernetes · AWS (EKS, Lambda, SQS) · MongoDB · PostgreSQL · Redis · Camunda · Apache Camel · Keycloak · OpenTelemetry 🌐 Portfolio: https://manthan8219.vercel.app

Location

Pune District

AI stack

anthropic apis

claude code

claude

codex

cursor

langchain

langfuse

langgraph

mcp

n8n

ollama

openai

opencode

Work experience

Back End Developer at Boomerang, Mar 2023 - Present · 3 yrs 5 mos, Pune, Maharashtra, India, • Architected enterprise-scale GraphQL API gateway using Apollo Server 4.x, integrating 25+ microservices through gRPC Protocol Buffers, reducing query latency by 40% with DataLoader patterns and Redis caching • Built AI-powered sales intelligence platform with OpenAI GPT-4 Turbo and Azure AI, achieving 95%+ contact data enrichment rates while processing millions of records through Apache Beam ETL pipelines • Designed reactive microservices architecture using Spring WebFlux, managing 50+ gRPC services and Camunda BPM automation with 100+ concurrent jobs for real-time CRM synchronization (Salesforce, HubSpot, SalesLoft) • Engineered multi-database architecture supporting 12+ MongoDB databases, PostgreSQL, MySQL, and Redis with Spring Data JPA, R2DBC reactive access, and HikariCP connection pooling for optimal performance • Developed cloud-native infrastructure on AWS Kubernetes (EKS) with Helm charts, Lambda serverless functions, SQS message queues, and Infrastructure as Code using Terraform • Implemented enterprise security with Keycloak SSO, OAuth2/JWT authentication, Spring Security, RBAC, and multi-tenant architecture across all microservices • Established observability ecosystem using OpenTelemetry, Jaeger distributed tracing, Prometheus metrics, and Grafana dashboards achieving 99.9% system uptime • Built AI agent framework using LangChain and LangGraph for autonomous task execution, handling complex workflows with 50+ integrated tools and external APIs • Designed event-driven architecture with Apache Camel for enterprise integration patterns, webhook processing, and asynchronous job scheduling • Implemented comprehensive data migration pipelines using Apache Beam, handling millions of records with batch processing, transformation, and validation logic

Software Engineer at Buyerassist.io, Jul 2022 - Mar 2023 · 9 mos, • Developed comprehensive GraphQL API server using TypeScript and Express.js with DataLoader patterns for N+1 query optimization and efficient batch loading • Engineered multi-database architecture integrating DynamoDB, MongoDB, and MySQL with efficient data access patterns, connection pooling, and query optimization • Led critical user migration from MongoDB to Keycloak identity management system with zero-downtime migration strategy, OAuth2/OIDC integration, and seamless authentication flow • Mastered AWS cloud ecosystem including ECS container orchestration, Route53 DNS management, S3 object storage, CloudFront CDN, RDS managed databases, ElastiCache Redis, and ECR container registry • Built REST APIs with Express.js and Node.js, implementing authentication middleware, request validation, error handling, and API documentation • Collaborated with cross-functional teams using Agile methodologies, participating in sprint planning, code reviews, and technical design discussions

Software Developer Internship at Nagarro, Jan 2022 - Jul 2022 · 7 mos, Gurugram, Haryana, India, • Completed intensive 6-month software development training program in Java, Spring Boot, Spring Security, and enterprise application development • Built foundational expertise in Node.js, AngularJS, MongoDB, PostgreSQL, and full-stack web development • Implemented Spring Web Security with JWT authentication, role-based access control, and secure API development best practices • Developed hands-on experience with RESTful API design, database modeling, and MVC architecture patterns

Summer Intern at Virtually Testing Foundation, Jan 2021 - Mar 2021 · 3 mos

Education

Bachelor of Technology - BTech, Computer Science, Lovely Professional University