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Senior Software Engineer with 17+ years architecting and shipping production systems in .NET, Java/Spring, and Python across AI-enabled commerce, healthcare, and financial platforms. Specialized in event-driven architectures, secure API design, and cloud-native infrastructure on AWS. Currently at Amazon building Bedrock-powered conversational AI and RAG-driven retrieval into production shopping experiences. I build end-to-end full-stack and cloud systems with a strong focus on reliability, performance, and security—leveraging reactive/non-blocking backends, GraphQL with OAuth/JWT, contract testing, and observability. My work includes AI agent workflows, HIPAA-compliant healthcare platforms, and financial services data/streaming pipelines, delivered through automated CI/CD and infrastructure-as-code.…Senior Software Engineer with 17+ years architecting and shipping production systems in .NET, Java/Spring, and Python across AI-enabled commerce, healthcare, and financial platforms. Specialized in event-driven architectures, secure API design, and cloud-native infrastructure on AWS. Currently at Amazon building Bedrock-powered conversational AI and RAG-driven retrieval into production shopping experiences. I build end-to-end full-stack and cloud systems with a strong focus on reliability, performance, and security—leveraging reactive/non-blocking backends, GraphQL with OAuth/JWT, contract testing, and observability. My work includes AI agent workflows, HIPAA-compliant healthcare platforms, and financial services data/streaming pipelines, delivered through automated CI/CD and infrastructure-as-code.

Jimmy Sambu(o)

Software Engineer, Full Stack Developer, DevOps Developer, +2

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Senior Software Engineer with 17+ years architecting and shipping production systems in .NET, Java/Spring, and Python across AI-enabled commerce, healthcare, and financial platforms. Specialized in event-driven architectures, secure API design, and cloud-native infrastructure on AWS. Currently at Amazon building Bedrock-powered conversational AI and RAG-driven retrieval into production shopping experiences. I build end-to-end full-stack and cloud systems with a strong focus on reliability, performance, and security—leveraging reactive/non-blocking backends, GraphQL with OAuth/JWT, contract testing, and observability. My work includes AI agent workflows, HIPAA-compliant healthcare platforms, and financial services data/streaming pipelines, delivered through automated CI/CD and infrastructure-as-code.…Senior Software Engineer with 17+ years architecting and shipping production systems in .NET, Java/Spring, and Python across AI-enabled commerce, healthcare, and financial platforms. Specialized in event-driven architectures, secure API design, and cloud-native infrastructure on AWS. Currently at Amazon building Bedrock-powered conversational AI and RAG-driven retrieval into production shopping experiences. I build end-to-end full-stack and cloud systems with a strong focus on reliability, performance, and security—leveraging reactive/non-blocking backends, GraphQL with OAuth/JWT, contract testing, and observability. My work includes AI agent workflows, HIPAA-compliant healthcare platforms, and financial services data/streaming pipelines, delivered through automated CI/CD and infrastructure-as-code.

Available to hire

Senior Software Engineer with 17+ years architecting and shipping production systems in .NET, Java/Spring, and Python across AI-enabled commerce, healthcare, and financial platforms. Specialized in event-driven architectures, secure API design, and cloud-native infrastructure on AWS. Currently at Amazon building Bedrock-powered conversational AI and RAG-driven retrieval into production shopping experiences.

I build end-to-end full-stack and cloud systems with a strong focus on reliability, performance, and security—leveraging reactive/non-blocking backends, GraphQL with OAuth/JWT, contract testing, and observability. My work includes AI agent workflows, HIPAA-compliant healthcare platforms, and financial services data/streaming pipelines, delivered through automated CI/CD and infrastructure-as-code.

Skills

Experience Level

Expert

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Language

Javanese

Advanced

English

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Work Experience

Senior Software Engineer | Amazon at Amazon

October 1, 2024 - Present

Built an AI-powered shopping assistant on Amazon Bedrock using confidence-aware RAG retrieval over OpenSearch with source-cited responses, reducing unsupported answers during product research. Designed Bedrock Agents workflows with structured tool calling and approval checkpoints for safe execution of price-alert and cart actions. Rebuilt the backend as a non-blocking Spring WebFlux pipeline on Java 17 with PostgreSQL behind OAuth2/JWT-secured GraphQL and Redis-backed retries, maintaining stable high concurrency latency. Rebuilt the shopper UI in React/Next.js using TanStack Query and Zustand to reduce perceived latency via optimistic, stale-while-revalidate caching. Added contract testing (JUnit/Mockito/Testcontainers/WireMock) to stub model responses and catch regressions pre-release, and built an idempotent catalog-enrichment pipeline on DynamoDB/Aurora/S3/EventBridge with Flyway versioning to prevent duplicate writes. Re-platformed onto EKS with least-privilege IAM and KMS-encrypte

Senior Software Engineer | Amazon (AI-enabled platforms) at Amazon

October 1, 2024 - Present

Built an AI-powered shopping assistant using Amazon Bedrock and Python, replacing single-pass prompting with confidence-aware RAG retrieval over OpenSearch and producing source-cited responses to reduce unsupported answers. Designed a safe Bedrock Agents workflow with Step Functions and Lambda, using structured tool calling and approval checkpoints for actions like price-alerts and cart updates. Rebuilt the backend as a non-blocking Spring WebFlux pipeline with Java 17 and PostgreSQL behind OAuth2/JWT-secured GraphQL, and introduced Redis-backed retries to maintain steady P99 latency under concurrency. Rebuilt the UI with React/Next.js using TanStack Query and Zustand, replacing full-page refetches with optimistic stale-while-revalidate caching. Implemented contract testing using JUnit, Mockito, Testcontainers, and WireMock to stub model responses and catch regressions in checkout flows with Cypress/Playwright.

Senior Software Engineer at One Medical

August 1, 2021 - October 1, 2024

Built HIPAA-compliant care platform APIs using FastAPI, Pydantic, and Alembic versioned migrations on PostgreSQL, replacing legacy synchronous messaging with async schema-validated APIs. Rebuilt the patient portal in React using Redux Toolkit and RTK Query for normalized cache invalidation across booking and messaging. Launched pay-per-visit telehealth with Django REST Framework, Celery, RabbitMQ, and WebRTC signaling for stable visits over unreliable connections. Built appointment scheduling using Flask and APScheduler with Pandas no-show modeling to auto-release same-day waitlist slots. Implemented an identity bridge mapping FHIR/HL7 patient records to scoped OAuth2 grants, syncing consent and eligibility without exposing PHI beyond the system of record. Automated releases with CircleCI and Podman and used OpenTofu-driven blue-green promotion for compliance sign-off.

Master Software Engineer at Capital One

June 1, 2014 - July 1, 2021

Rebuilt a digital banking servicing layer using ASP.NET Web API and Entity Framework over SQL Server, consolidating balances, autopay, and purchase alert endpoints into a single versioned service. Rebuilt the account servicing UI in Angular using NgRx state management and Reactive Forms validation to improve fraud-notification consistency. Built an Auto Navigator prequalification service with .NET Core, MediatR, and FluentValidation to encapsulate APR rules behind versioned handlers. Extended Eno conversational banking using SignalR push notifications and Kafka-driven NLP intent routing, with Polly retries/backoff around downstream calls for resilience. Built real-time transaction-protection scoring with Kinesis streaming and Confluent.Kafka, caching risk signals in Redis before ML scoring. Migrated services to AWS using ECS/EKS and codified environments with CloudFormation, meeting audit and availability requirements.

Software Engineer at Driven, Inc.

November 1, 2013 - May 1, 2014

Converted the Driven ONE desktop client into a JavaScript/Backbone.js single-page app, replacing native dialogs with jQuery-driven modals to preserve workflows. Rebuilt client-side navigation using hash-based routing and reusable views, replacing full-page reloads with async REST calls for responsive multi-step forms. Diagnosed cross-browser regressions with Chrome DevTools and Git to isolate defects before release.

Developer at Blast Zone Studios

February 1, 2013 - February 1, 2017

Built iOS and Android game clients in Objective-C, Swift, and Java using UIKit/Android SDK, sharing gameplay state logic across platforms for feature parity. Implemented touch-gesture and animation systems tuned per device tier and profiled frame drops on low-end Android hardware. Built an offline-tolerant sync layer using SQLite and JSON-cached REST responses, queuing writes locally so player progress survived intermittent connectivity. Owned release engineering with Xcode, Android Studio, and Gradle, using TestFlight beta rings to catch device-specific crashes before App Store/Google Play submission.

Software Engineer at Blast Zone Studios

February 1, 2013 - February 1, 2017

Built iOS and Android game clients in Objective-C, Swift, and Java on UIKit/Android SDK, sharing gameplay-state logic across platforms. Implemented touch-gesture and animation systems tuned per device tier and profiled frame drops on low-end Android hardware to keep gameplay smooth. Built an offline-tolerant sync layer using SQLite and JSON-cached REST responses, queuing writes locally so player progress survived intermittent connectivity. Owned release engineering with Xcode and Gradle, using TestFlight beta rings to catch device-specific crashes before App Store and Google Play submissions.

Software Engineer at REI Systems

March 1, 2009 - June 1, 2012

Built a Section 508-compliant HRSA case-management module in Java/Spring MVC on Oracle, replacing paper-based intake with accessible JSP/jQuery workflows. Owned the FTCA module end-to-end by encoding eligibility rules in Hibernate-mapped domain objects to keep processing and reporting consistent through policy changes. Validated releases across a 200+ person organization with JUnit and Selenium on WebLogic, catching defects from parallel Subversion branches.