Open to opportunities

Tomasz Duong

@tomaszduong

Software Architect designing distributed, highly available services—owning performance, reliability, and pragmatic cloud delivery.

Poland

Message

What I'm looking for

I’m looking to architect and operate distributed, highly available services with strong ownership—improving latency, throughput, caching, and data pipelines—while building reliable CI/CD, observability, and incident response practices in cloud-native environments.

I’m a Software Architect focused on designing and operating distributed, highly available services for global consumer platforms. I bring strong ownership and pragmatic engineering judgment, with hands-on experience across backend, data, and cloud infrastructure.

At ActiveState, I architected distributed services in Java and PHP, reducing interservice latency by 32% and enabling 3x peak concurrency. I scaled event pipelines with Kafka and Kafka Streams—processing 120M+ events per day and improving end-to-end throughput by 48% while preserving ordering guarantees.

I design for performance end to end: normalized MySQL schemas and indexes to cut slow queries by 67%, and used Redis caching to lower origin reads by 74%. I also lead rollout and operational excellence with Docker, Kubernetes, Helm, Prometheus/Grafana monitoring, and ELK-based logging/search, trimming mean time to detect from 14 minutes to 3 minutes.

I’ve also built and shipped distributed systems across multiple stages of my career, from full-stack work to senior engineering roles. Earlier experience includes microservice API contracts and async integrations with Kafka/RabbitMQ, plus reliability improvements through CI/CD automation and Linux-based operational tooling.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

ActiveState

Sep 2022 - Dec 2025 (3 years 3 months)

Architected distributed Java/PHP services across regions, reducing interservice latency by 32% and scaling to 3x peak API concurrency. Scaled Kafka/Kafka Streams pipelines to 120M+ events/day, cut slow MySQL queries by 67%, reduced origin reads 74% with Redis, and improved observability (MTTD 14→3 minutes) while deploying 120 microservices with 85% automated release coverage.

Java PHP Kafka Kafka Streams MySQL Redis Docker Kubernetes Prometheus Grafana

Full Stack Engineer

DcsL Guidesmiths

Nov 2019 - Jun 2022 (2 years 7 months)

Designed Java/Node.js microservice API contracts, cutting feature lead time by 26%, and implemented Kafka/RabbitMQ async integrations handling 4M messages weekly at 99.99% delivery. Improved performance by reducing report time (7 minutes→45 seconds), lowering request latency 55% via Redis caching, and boosted frontend Lighthouse scores by 22%, while migrating legacy APIs on GCP and streamlining CI

NodeJS Java Node.Js Kafka RabbitMQ MySQL Redis React TypeScript GCP Jenkins

Software Developer

Newwave Solutions

Sep 2017 - Aug 2019 (1 year 11 months)

Built RESTful PHP/Node.js ecommerce services supporting 150k monthly active users and reduced checkout errors by 29%. Integrated MongoDB for catalogs, accelerated nightly batch jobs 5x with Kafka/Redis queues, improved MySQL models (83% less full table scan frequency), raised test coverage 42%→78%, and delivered zero-downtime Docker blue-green deployments for 6 releases.

NodeJS PHP Node.Js REST APIs MongoDB Kafka Redis MySQL Mocha Jest Docker

Junior Developer

PowerGate Software

Sep 2016 - Jul 2017 (10 months)

Implemented PHP/MySQL backend features for client portals, delivering 8 modules in 9 months and reducing onboarding time by 47%. Built multi-tenant migration tooling (rollout time -33%), improved reliability with Unix shell/cron monitoring (MTTA -50%), and reduced common endpoint API latency by 28% using Redis; resolved 120+ defects and improved sprint predictability by 21%.

PHP MySQL Redis Shell Scripting Unit Testing Debugging API Documentation Git