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I am a Senior Backend & Fullstack Engineer with 10+ years building production-grade backend systems, low-latency APIs, and distributed architectures for high-traffic environments. I’ve led the Docker Hub backend and shipped AI-enabled decisioning pipelines, weaving ML/LLM integration into scalable cloud-native platforms on AWS and Kubernetes. I enjoy turning complex problems into robust, observable systems and collaborating with cross-functional teams to ship reliable software. I’m open to remote collaboration across US/EU/APAC hours and enjoy mentoring others, elevating engineering practices, and delivering impact through fast iterations, strong security, and thoughtful design in fintech, cloud, and developer tooling ecosystems.…I am a Senior Backend & Fullstack Engineer with 10+ years building production-grade backend systems, low-latency APIs, and distributed architectures for high-traffic environments. I’ve led the Docker Hub backend and shipped AI-enabled decisioning pipelines, weaving ML/LLM integration into scalable cloud-native platforms on AWS and Kubernetes. I enjoy turning complex problems into robust, observable systems and collaborating with cross-functional teams to ship reliable software. I’m open to remote collaboration across US/EU/APAC hours and enjoy mentoring others, elevating engineering practices, and delivering impact through fast iterations, strong security, and thoughtful design in fintech, cloud, and developer tooling ecosystems.

John Angelo Zalameda Santos

Full Stack Developer, Back-End Developer, Web Developer, +3

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I am a Senior Backend & Fullstack Engineer with 10+ years building production-grade backend systems, low-latency APIs, and distributed architectures for high-traffic environments. I’ve led the Docker Hub backend and shipped AI-enabled decisioning pipelines, weaving ML/LLM integration into scalable cloud-native platforms on AWS and Kubernetes. I enjoy turning complex problems into robust, observable systems and collaborating with cross-functional teams to ship reliable software. I’m open to remote collaboration across US/EU/APAC hours and enjoy mentoring others, elevating engineering practices, and delivering impact through fast iterations, strong security, and thoughtful design in fintech, cloud, and developer tooling ecosystems.…I am a Senior Backend & Fullstack Engineer with 10+ years building production-grade backend systems, low-latency APIs, and distributed architectures for high-traffic environments. I’ve led the Docker Hub backend and shipped AI-enabled decisioning pipelines, weaving ML/LLM integration into scalable cloud-native platforms on AWS and Kubernetes. I enjoy turning complex problems into robust, observable systems and collaborating with cross-functional teams to ship reliable software. I’m open to remote collaboration across US/EU/APAC hours and enjoy mentoring others, elevating engineering practices, and delivering impact through fast iterations, strong security, and thoughtful design in fintech, cloud, and developer tooling ecosystems.

Available to hire

I am a Senior Backend & Fullstack Engineer with 10+ years building production-grade backend systems, low-latency APIs, and distributed architectures for high-traffic environments. I’ve led the Docker Hub backend and shipped AI-enabled decisioning pipelines, weaving ML/LLM integration into scalable cloud-native platforms on AWS and Kubernetes. I enjoy turning complex problems into robust, observable systems and collaborating with cross-functional teams to ship reliable software.

I’m open to remote collaboration across US/EU/APAC hours and enjoy mentoring others, elevating engineering practices, and delivering impact through fast iterations, strong security, and thoughtful design in fintech, cloud, and developer tooling ecosystems.

Skills

Experience Level

Expert

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Expert

Intermediate

Work Experience

Senior Backend / AI Engineer at Oscilar

February 1, 2023 - Present

Architected real-time, event-driven decisioning microservices on Kafka with CQRS and exactly-once delivery, processing 10K+ events/sec with 99.9%+ uptime. Built low-latency decision APIs in Java Spring Boot, Python FastAPI, and Node.js; implemented circuit breakers and bulkhead isolation; optimized PostgreSQL queries and Redis caching; designed a gRPC-based internal service mesh with OpenTelemetry tracing; built real-time feature pipelines on Redis Streams; enforced idempotency, retries, and dead-letter queues across Kafka consumers.

Backend / Fullstack Developer at Docker

April 1, 2020 - December 1, 2022

Built high-performance REST APIs for Docker Hub registry operations (image push/pull, tag management, repository metadata) handling millions of daily requests with sub-200ms p99 latency. Reduced API latency on critical endpoints through query optimization, multi-tier caching, and connection pool tuning. Designed event-driven pipelines on Kafka for image scanning, vulnerability indexing, and tag propagation across globally distributed registry replicas. Integrated S3 and CloudFront as storage and CDN for container image layers, enabling petabyte-scale distributed storage across regions. Optimized PostgreSQL queries and Redis caching for repository search and metadata lookups, reducing database load by 45% during peak traffic. Operated containerized environments with Docker and Kubernetes, ensuring consistent deployments across dev, staging, and production. Built testing frameworks with PyTest and Jest, improving release reliability and reducing production incidents by 35%. Contributed t

Backend / Fullstack Developer at Docker Hub

April 1, 2020 - December 1, 2022

Built high-performance REST APIs for registry operations (image push/pull, tag management, repository metadata) handling millions of daily requests with sub-200ms p99 latency. Reduced API latency via query optimization and multi-tier caching; designed event-driven pipelines on Kafka for scanning, indexing, and tag propagation; integrated S3/CloudFront for petabyte-scale storage; optimized PostgreSQL and Redis; developed Docker Hub UI components with React.

Mid-Level Developer at Octopus Deploy

February 1, 2018 - February 1, 2020

Developed REST APIs powering deployment orchestration, release management, and runbook automation. Improved hot endpoint latency from 100ms to 40ms; contributed to monolith-to-microservices migration; implemented secure mTLS between server and Tentacle agents; supported CI/CD integrations (Jenkins, GitHub Actions, Azure DevOps); worked with SQL Server for deployment data and logs.

Fullstack Developer at White Cloak Technologies

December 1, 2015 - November 1, 2017

UnionBank Online — flagship digital banking platform; built secure REST APIs for fund transfers, bill payments, account management, and statements; designed microservices; implemented OAuth 2.0 and MFA for compliance; supported AWS infrastructure for high availability during peak volumes.

Web Developer at Startechup Inc.

December 1, 2013 - October 1, 2015

Delivered full-stack e-commerce applications; built APIs for product catalogs, orders, and inventory; optimized relational databases and indexing; integrated third-party payment gateways and logistics providers for scalable storefronts.