Open to opportunities

Mateusz Nguyen

@mateusznguyen

Senior backend & full-stack engineer building high-throughput data pipelines and enterprise SaaS with Go and Kubernetes.

Poland

Message

What I'm looking for

I want to build scalable backend platforms and data pipelines that deliver measurable performance gains. I’m looking for teams that value observability, benchmarking, CI/CD/GitOps, and continuous code health—so I can keep reducing latency, improving throughput, and mentoring engineers.

I’m a Senior Software Engineer with 9 years of backend and full stack experience, specializing in high-throughput data pipelines and enterprise SaaS. I design distributed systems and optimize both analytics and OLTP stores, using Go and microservices to deliver measurable results—reducing end-to-end latency by 32% and improving ingestion throughput by 3x.

At my current role, I’ve modernized platforms with Docker and Kubernetes, architected streaming ingestion with Kafka and gRPC, and migrated analytical workloads to ClickHouse while keeping transactional data in PostgreSQL—cutting analytic query times by 60%. I’m deeply hands-on with observability (Prometheus/Grafana), performance benchmarking and profiling (pprof, Flamegraphs, k6), and CI/CD + GitOps, and I lead code health through technical-debt sprints while mentoring engineers on performance and profiling.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

ProtecWise Inc

Aug 2023 - Present (2 years 9 months)

Spearheaded Go backend and streaming ingestion services processing 150,000 events/hour, cutting end-to-end latency 32% and increasing ingestion throughput 3x while reducing backlog 87%. Built Docker/Kubernetes microservices, migrated analytics to ClickHouse, optimized PostgreSQL (90s→18s reports), and automated Terraform + GitHub Actions deployments with a 95% success rate.

Go Kafka gRPC Docker Kubernetes Terraform Helm Clickhouse PostgreSQL

Full Stack Engineer

Zego

May 2019 - Apr 2023 (3 years 11 months)

Led a Golang microservices platform delivering 99.95% uptime and 2M API calls/day, using Kafka plus ClickHouse/PostgreSQL to power real-time analytics and sub-second dashboards. Improved reliability and performance (error rate -42%, k6 at 10,000 RPS with sub-200ms p95), strengthened observability, and shipped SaaS capabilities contributing to an 18% ARR uplift.

Golang Kafka Clickhouse PostgreSQL gRPC REST Docker Kubernetes GitOps

Full Stack Developer

VentureCraft

Dec 2017 - May 2019 (1 year 5 months)

Built event-driven backend services in Python and Go for 50,000 monthly transactions, improving reliability by 35% and accelerating reporting by moving to PostgreSQL-based analytics (6h→45min). Streamlined Docker + CircleCI CI/CD (manual deploys -90%), tuned SQL with materialized views (4x faster reports), and migrated a monolith to 12 microservices, increasing release cadence 3x.

Python Go PostgreSQL Redis Docker CircleCi Materialized Views SQL Tuning Microservices

Frontend Developer

Grab

Nov 2016 - Nov 2017 (1 year)

Created lightweight backend endpoints in Node.js/Express to support real-time rider matching, reducing matchmaking latency by 22% and scaling to 10,000 concurrent connections with Docker/Kubernetes. Implemented Redis caching and Prometheus/Grafana monitoring to cut database reads by 58% and incidents by 35%, and optimized PostgreSQL geospatial queries (300ms→80ms) while resolving surge-related fau