experiences

• Tasco / VETC

Tasco — Vietnam's ETC operator; VETC super-app serves 4.3M+ users (wallet, toll collection). VETC Go is its B2C self-drive car-rental platform, shipped both as a mini-program inside the super-app and as a standalone web/mobile product.

• Software Engineer • Contract / part-time • Jul 2026 – Aug 2026
• - Tech stack: Golang, Next.js/React, Flutter, PostgreSQL, Redis, gRPC/Protobuf, Kong, Docker, Kubernetes (FPT Cloud), Helm, Terraform, Prometheus/Grafana.
• - Shipped vetcgo.vn in ~3 weeks — Next.js 15 App Router marketing site + booking funnel, same-origin BFF with httpOnly-cookie auth, SSR for SEO, GA4/GTM with Consent Mode v2. Live in production.
• - Monolith → Go microservices: ported a NestJS monolith to 8+ Go services (identity, customer, ops, pricing, payment, push, sms, map) behind a stable gateway contract. Kept both backends provably equivalent with a language-agnostic conformance suite running the same specs against each.
• - Integrated the VETC super-app end-to-end: OAuth (client-credentials + auth-code exchange), payment create/refund, HMAC-verified IPN webhooks, signed deeplinks — plus VNPay IPN spec compliance and two-way webhook logging.
• - Built the SRE tooling from scratch: one sre CLI for build/deploy/rollback/secrets across ~12 apps, cluster-side buildkit, immutable commit-derived image tags, age-encrypted secrets safe to commit.
• - Shared Prometheus package across all Go services (HTTP RED + gRPC server/client metrics) on a dedicated port unreachable from ingress by construction.
• - Delivered Flutter customer & staff apps (Android/iOS/Web) with FCM push, SSE live trip status, and in-house APK distribution via presigned URLs.
• BeGroup

Be Group - one of Vietnam's fastest-growing tech startups, operator of the Be super app (ride-hailing, food delivery, super-app). Serving 9M+ customers nationwide, with 300,000+ drivers and tens of millions of monthly transactions.

• Senior Software Engineer • Aug 2023 – Present • 3 yrs
• - Tech stack: Golang, MySQL, Kafka/Google Pub/Sub, Redis, Docker, Kubernetes, Grafana, Prometheus, pprof.
• - Built and maintained large-scale systems: AI Platform, CDP, Notification Platform, Fraud Detection, Event Pipeline. Acted as embedded PM across all products — owning requirements, aligning stakeholders, and driving delivery end-to-end.
• - AI Platform & LLM Integration: Led end-to-end design and delivery of an AI Platform powering multiple AI agent products. Defined technical direction, integrated LLMs (OpenAI API), RAG pipelines, and agent orchestration. Worked directly with PMs and business stakeholders to translate use-cases into shipped products — with a lean team.
• - CDP & Notification Platform: Architected scalable user engagement system delivering >150M messages/day with personalized fare config per user. Collaborated with product and data teams to align on targeting logic and rollout strategy.
• - Fraud Detection System: Designed real-time fraud detection processing >30M rule-based users, catching >10K fraudulent transactions/day. Worked cross-functionally with operations, risk, and product to define rules and acceptance criteria.
• - Diagnosed memory & goroutine leaks in Be-kit using pprof, reducing system cost and improving stability. Conducted internal tech talk to share findings and upskill the team.
• - Authored cross-team architectural proposal: Monolith to Microservices — identified systemic risks, defined migration path, and gained alignment from engineering leads and product stakeholders.
• - Bridged system gaps and drove cross-functional technical initiatives end-to-end as a technical PM-embedded engineer.
• Achievements
• - Received BeStar Award 2024 for outstanding engineering contribution.

• Primedata.ai VN
• Backend Engineer • Full-time • Aug 2022 – Aug 2023 • 1 yr 1 mo
• - Tech stack: Golang, Python, gRPC, Kafka, Docker, Kubernetes, Grafana, PostgreSQL, ClickHouse, Redis, GitHub Actions.
• - Domain: Customer Data Platform (CDP).
• - Built and maintained the CDP SaaS product.
• - Took ownership of cross-functional glue work to ensure successful delivery.

• OLLI Technologies
• iOS Engineer • Full-time • Feb 2021 – Aug 2022 • 1 yr 6 mos
• - Tech stack: Swift, UIKit, SwiftUI.
• - Domain: IOT.
• - Owned the Home Assistant iOS application.
• - Reduced iOS build time by 80% through build system optimization and pipeline improvements.

• Umbala.tv
• iOS Engineer • Full-time • Feb 2019 – Nov 2020 • 1 yr 9 mos
• - Tech stack: Swift, UIKit.
• - Domain: ecommerce / social / live streaming.