Abbas Khan

About Abbas Khan

Software Development Engineer @ Amazon with 2.5+ years of experience building and operating large-scale distributed systems across Worldwide Returns & Recommerce (WWRR), Expansions Tech & Product, and Pricing platforms, powering customer-facing return, refund, and pricing experiences across global marketplaces.I’m a backend-heavy Java engineer with strong end-to-end ownership — from HLD/LLD and API design through implementation, deployment, and on-call operations. I’ve owned and delivered core Customer Return Experience (CREX) features (Return Items, Post-Return Experience) and designed reusable, widgetised architectures to improve consistency, reuse, and developer velocity at scale.In WWRR, I helped redesign the Online Return Center (ORC) customer pages and backend contracts, enabling cleaner service boundaries and domain models. This reduced coupling and cut change-related defects by ~25% while supporting millions of annual return events.I built two internal, customer-facing APIs following AWS engineering and security standards, and led integrations with external clients to automate migration from deprecated packages to newer platforms, reducing manual effort and improving maintainability.I drove enhancements to returns and refunds orchestration, improving return completion rates and reducing downstream reprocessing and customer re-contact. This included strengthening refund notifications, adding refund SLA validation, and integrating a new payment instrument, supporting millions of dollars in annual refund volume.I also contributed to MTRI return flows, integrating backend orchestration with agentic LLM workflows using Amazon Bedrock, reducing incorrect refunds and manual reviews and contributing to ~$5–10MM in annualized savings.On the Pricing platform, I designed pricing entities and filtering logic for offer disqualification (FOD) and merchant selection. Across Expansions and Pricing, I built event-driven, resilient services for new marketplace launches, achieving ~20–30% reduction in failure retries, improved P99 latencies, and lower on-call load.I have a proven track record of delivering measurable business impact, obsess over customer success, enjoy solving complex technical challenges, and am passionate about mentoring peers.Tech: Java, Spring, Microservices, Kafka, AWS (ECS, Lambda, DynamoDB, SNS/SQS, S3, OpenSearch, CloudWatch,Scala, Typescript, JavaScript.

Experience

1. Software Development Engineer

   Amazon

   Dec 2023 — Present · Hyderabad, IN

   Working as an SDE at Amazon across Expansions Tech & Product, Worldwide Customer Returns & Recommerce (WCRR), and Pricing platforms. I engineered and optimized Online Return Center (ORC) workflows to simplify the returns journey, integrated new payment methods and delivery carriers, and designed scalable, configuration-driven architectures to accelerate global marketplace onboarding. I delivered Prime and Peak Readiness initiatives, improved system reliability through expanded Unit, Integration, and E2E test coverage, and strengthened CI/CD pipelines to support multi-region deployments across EU, NA, and FE.I owned on-call operations, resolved high-severity production incidents, and led JDK and AWS CDK migrations. I designed secure REST APIs (Smithy, Swagger) with strong PII protection, built CloudWatch dashboards and alarms, and managed AWS infrastructure using ECS, Lambda, Route53, SQS/SNS, DynamoDB, CloudFormation, and CDK (TypeScript), with core backend development in Java and Guice. I improved system scalability by ~50% using an event-driven architecture with Apache Kafka (MSK), and built an internal ticketing and debugging chatbot using Amazon Bedrock (Claude multimodal) with asynchronous workflows.In parallel, I worked on Pricing and Offer Disqualification systems, implementing merchant eligibility filtering using Kinesis, Lambda, and DynamoDB. I designed resilient pricing ingestion pipelines with SQS DLQs for failure tracing, enabled low-latency analytics via OpenSearch, modernized CI/CD pipelines using Docker, AWS Fargate, ECS, and EventBridge, and contributed to frontend development using React.js for internal UI widgets and pub/sub–based event triggering.Built DynamoDB-backed caching with optimized TTL achieving ~90% cache hit ratio, significantly reducing backend reads and improving response latency. Developed rate limiting and throttling mechanisms to protect downstream services and ensure SLA compliance.

Education

• Government High School, Pileru

  SSC

• Jawaharlal Nehru Technological University Anantapur (JNTUA)

  Bachelor of Technology - BTech, Electrical and Electronics Engineering

  2019 — 2023

• Hyderabad Institute of Excellence - India

  Intermediate(MPC)