Lead Software Engineer · Zalo PC
Hands-on technical leader building cross-device products, dependable client storage, and reliable production delivery.

I am a Lead Software Engineer at Zalo PC with 8+ years delivering production software across consumer-scale messaging, customer data platforms (CDP), fintech integrations, education, e-commerce, and internal engineering platforms.

I combine hands-on engineering with technical leadership: turning ambiguous goals into dependable systems, guiding architecture and code quality, coordinating delivery, and strengthening observability and production operations.

Now:       Lead Software Engineer @ Zalo PC             (Mar 2, 2026 – Present)
Previous:  NDSVN JSC · Zalo PC @ VNG · PrimeData CDxP · Splus Software · Propman
Core:      React · Electron · TypeScript · Node.js · Kotlin · Kubernetes
Based in:  Ho Chi Minh City, Vietnam · open to remote

• I move from UI architecture → backend contracts → rollout strategy → observability → production recovery without losing product context.
• I bring structure when teams are scaling: ownership boundaries, RFCs, release playbooks, branch strategy, runbooks, and coaching.
• I care about visible outcomes: faster delivery, safer releases, clearer systems, fewer regressions, and stronger user experience.
• I am comfortable in high-context environments where product, engineering, business, security, and operations all meet.

• Returned to Zalo PC in a Lead role, combining hands-on delivery with technical leadership across cross-device messaging and client storage.
• Delivered message backup on Zalo PC with restore on mobile, helping users retain text conversation history across device changes; the July 2026 launch was covered by VnExpress.
• Improved zCloud offload reliability and observability, making client-storage issues easier to detect and diagnose.
• Lead the engineering team through technical decisions, code reviews, and delivery coordination.

• Took technical ownership after a CTO transition, aligning architecture, delivery, rollout systems, and enterprise integrations while leading 8 developers (4 senior) and 3 QC engineers.
• Engineered a .NET Core multi-tenant feature-flag platform for 30+ tenants and ~40K users — priority rule engine, percentage rollout (tenant/segment/env), JSON-config values, and stateless runtime evaluation.
• Built secure Gtel & Napas integrations — RSA-4096 handshake, AES-256 payloads, mTLS, certificate pinning, idempotent contracts, retry queues, and ACK-driven monitoring.
• Shipped Micro-Frontend architecture (Angular host + React modules) for independent deploy cycles and a smaller regression surface.
• Stabilized inherited infrastructure across ArgoCD, CI/CD, domains/SSL, and AKS/FKE/K3S/EKS clusters — turning recurring unknowns into diagnosable, recoverable systems.
• Built AI-assisted engineering agents for code review, deployment support, service-quota checks, API health, and release analysis.
• Rebuilt the engineering operating model: org chart, competency matrix, ownership maps, RFCs, runbooks, release tagging, and structured hiring.

• Core engineer on cross-platform Zalo PC (Web, macOS, Windows) serving 15M+ MAU; also maintained Zalo Android at ~80M users.
• Delivered 10+ features — dark mode, download flows, Kiki assistant surfaces, logging, and behavior tracking.
• Built promotion-flow tracking and monitoring driving activation across 15M+ MAU.
• Led Storybook-based design-system work supporting UI consistency for 50+ developers.

• Built CDxP, a customer data platform that unifies and activates customer profiles across disconnected systems; led a front-end team of 4 across 10+ projects.
• Shipped product surfaces for 360 customer profiles, campaign builders, analytics, segmentation, and partner demos.
• Developed a lightweight JS SDK under 200KB with sub-150ms load before deeper bundle optimization.
• Established BDD/E2E coverage with 100+ scenarios and 1,000+ test cases.

• Owned the product end-to-end (UI/UX → engineering → growth), reaching 10,000+ visits and 3,000+ signups within two months.
• Grew acquisition with technical SEO, PWA installability, and a mobile-first app-store release path.
• Ran lean on a single Cloud Run instance (1 CPU, 256 MiB) while monetizing with Google Ads and Stripe.

_{Also: MySQL · Firebase · Strapi · Directus · React Flow · Redux · React Query · G2plot · Jest · Cucumber · Puppeteer · Testing Library · Flutter}

I write and build in the open — these double as evidence of how I think:

• ✍️ Blog — software architecture & engineering, explained simply (Ports & Adapters → system design, with diagrams).
• 🌱 Notes — a personal digital garden / knowledge graph on craft, decisions, and learning.
• 🧰 Apps — tiny, fast, open-source tools.
• 🖼️ Gallery — certifications, awards, and project highlights.

• Cross-device messaging and client-storage continuity at Zalo PC.
• zCloud offload reliability, observability, and diagnosable failure paths.
• Hands-on technical leadership across architecture, code review, and delivery coordination.
• Product and platform systems balancing speed, maintainability, security, and production reliability.

• 🎓 B.IT, Nong Lam University — Minor in Software Engineering · Very Good classification · GPA 3.36 (2015–2019)
• 📜 Cybersecurity & Compliance Refresh Training — Coursera (verified)
• 🧪 Software Testing — Type-A certificate, GST
• 🏆 Best Rookie of the Year — Splus Software

• 🌐 Portfolio: nguyenlephong.github.io
• 📄 Résumé: view CV · download PDF
• 💼 LinkedIn: linkedin.com/in/phongnguyen-it
• ✉️ Email: phongnguyen.itengineer@gmail.com
• 🧩 LeetCode: leetcode.com/nguyenlephong
• ▶️ YouTube: @nguyenlephong
• 𝕏 / Twitter: @nguyenlephong17