Headline

Software Engineer | Backend Development | Java | Spring Boot | Distributed Systems | AWS (Lambda, Step Functions, S3) | Scalable Microservices | High-Throughput Messaging Systems

About

I’m a backend engineer with a strong foundation in computer science and hands-on experience building high-performance, distributed backend systems. At Onextel Ltd, I design and optimize microservices, RESTful APIs, and distributed architectures using Java, Spring Boot, Erlang, and AWS to support telecom-scale messaging pipelines. I specialize in backend development across: High-throughput distributed systems Performance engineering & multithreading Secure API architectures (JWT, RBAC, gateway layers) Scalable cloud services (Lambda, Step Functions, S3, SageMaker) Microservices engineering & API communication design Impact I’ve delivered: Designed multi-threaded pipelines capable of processing 1M+ records in milliseconds, boosting throughput and system responsiveness. Engineered a secure API gateway layer enforcing JWT authentication, centralized RBAC, and a hierarchical Account Privilege Model, protecting the majority of platform traffic and preventing unauthorized access across services. Built a serverless ML pipeline leveraging Lambda + Step Functions + SageMaker, enabling real-time delivery-vehicle classification with high-confidence predictions using transfer learning. Improved platform performance by adding scheduler-driven caching and precomputation layers, significantly reducing dashboard load time. While backend engineering is my primary focus, I also collaborate cross-functionally with QA, DevOps, product teams, and frontend developers — ensuring reliable delivery of end-to-end features. Clean architecture, maintainability, and predictable performance are values I bring to every system I work on. I enjoy solving complex distributed systems problems, optimizing microservices, and building cloud-native architectures that scale smoothly and reliably. Continuous learning drives me — whether it's exploring new AWS services, improving system design, or experimenting with ML deployment patterns. Let’s connect: If you're working on backend engineering, distributed systems, cloud architecture, or have roles in these areas, I’d love to connect and discuss opportunities or exchange ideas.

Location

Pune District

AI stack

gemini

github copilot

hugging face

notebooklm

obsidian

openai

Work experience

Software Engineer at OneXtel Media, Jul 2024 - Present · 2 y 2 mo, Pune District, •Led asynchronous messaging pipelines supporting 3,000–4,500 TPS, managing provider rate limits to successfully process ∼7.58B RCS and WhatsApp submissions across May–July 2026. • Accelerated payload processing by 57% for 1M+ records by engineering a highly concurrent pipeline, utilizing Roaring Bitmaps for efficient deduplication and rapid payload sanitization. • Eliminated 98% of duplicate message dispatches across a 20M-scale workload by deploying a retry-aware scheduler with exponential back off and RocksDB-backed state persistence. • Delivered pipeline resilience across a decentralized ecosystem by writing comprehensive unit and integration test suites using JUnit and Mockito, achieving 84.78% code coverage. • Decreased client dashboard response times by 93% through scheduler-driven caching and precomputation of delivery metrics, resolving expensive database locks. • Centralized security for 94% of inbound traffic by constructing a JWT-based proxy API gateway and full-stack authentication flows using React + TypeScript, deploying hierarchical RBAC to reduce client misconfigurations by 30%. • Led the transition of the messaging platform from an initial prototype to production deployment; discarded Apache Kafka and the ELK stack for custom-engineered pipelines to reduce infrastructure costs by 20%. • Improved production observability using Grafana, Prometheus, and structured logging, driving end-to-end tracing and reducing Mean Time to Resolution (MTTR) by 40% for dropped webhooks. • Collaborated with 3 cross-functional teams in an Agile environment, actively conducting peer code reviews to advance backend system architecture and coding standards. Onextel Ltd. Remote Software Engineer Intern May 2024 - Jul 2024 • Directed the requirement gathering and architectural prototyping phase for a CPaaS platform, independently developing 100% of the foundational proof-of-concept (PoC) that shaped the final infrastructure. • Designed an initial Java-based ingestion pipeline to parse and validate bulk messaging traffic, establishing the groundwork for the high-performance routing gateways constructed in the subsequent phase. • Programmed Spring Boot middleware to intercept and standardize 4 distinct telecom Delivery Receipt (DLR) webhooks, advancing the data models required for unified client reporting

Education

Bachelor of Technology - BTech, Computer Science and Engineering, National Institute of Technology Hamirpur-Alumni

Auckland House School

Public links

github: https://github.com/gazalshyam

leetcode: https://leetcode.com/gazalshyam18

medium: https://medium.com/@Gazalshyam18