Nguyen Le Phong

Owned product delivery and technical direction post-CTO transition, leading architecture decisions, rollout systems, enterprise-grade integrations, and cross-team alignment while managing a delivery team of 8 developers (including 4 seniors) and 3 QC engineers.

Key contributions

• Engineered a .NET Core multi-tenant feature flag system (30+ tenants, ~40k users) with a priority rule engine, percentage rollout (tenant/segment/env), JSON-config values, and stateless runtime evaluation—powering mobile/web apps and enabling controlled, progressive production releases across high-traffic tenants.
• Built secure integrations with Gtel & Napas: RSA-4096 handshake, AES-256 payload encryption, mTLS mutual authentication, certificate pinning, retry queues, idempotent API contracts, and ACK-driven monitoring for unstable third-party services.
• Implemented Micro-Frontend architecture (Angular host + React modules) enabling independent deploy cycles and feature isolation—reducing regression surface and deployment coupling across teams.
• Introduced observability stack (PostHog + metrics pipeline + workflow) for rollout impact, feature adoption, anomaly detection, and regression tracing—cut debugging/analysis time significantly across release cycles.
• Assumed ownership of inherited infrastructure and kept the organization moving—quietly absorbing production fires, pipeline failures, cluster quirks, and integration instability so the product and teams never stalled; shaping ArgoCD, CI/CD, domains/SSL, and AKS/FKE/K3S/EKS clusters into systems that are diagnosable, recoverable, and stable instead of recurring unknowns.
• Built AI agents supporting code review, deployment assistant, service-quota validation, API health monitoring, and release analysis; shortened decision & delivery loops across product teams.
• Developed integration simulations and sandbox/demo modules to handle unstable partners and secure pre-contract validation with third-party ecosystems.
• Re-structured engineering organization after leadership transition: defined org chart, competency matrix, workload routing, and ownership boundaries—unlocking autonomy and reducing lead-time on technical decisions.
• Established a unified engineering playbook: branch strategy, commit convention, release tagging, rollout criteria, API/integration rules, and technical spec repository (RFCs, runbooks, troubleshooting guides).
• Led hiring and capability growth loops: structured interviews (QC/Fullstack), onboarding path, 1:1 coaching, performance review cycles, and cross-team conflict resolution to keep delivery collaborative and output-focused.
• Maintained delivery quality through documentation-first culture and process guardrails (checklists, handover rules, rollback readiness), ensuring predictable release cadences during scaling.

Core developer for the cross-platform Zalo PC (Web, macOS, Windows), serving 15M+ MAU. Delivered key features such as dark mode, dynamic theming, and user behavior tracking. Spearheaded the development of a promotion flow and a scalable design system for 50+ developers. Optimized performance, enhanced maintainability, and contributed to business growth through robust and efficient solutions.

Actively maintained and improved Zalo’s Android mobile app, ensuring the stability and performance of critical features for nearly 80 million users.

Key contributions

• Delivered over 10 features, including dark mode, a download module, kiki bot, log tracking, and more, improving UX and engagement.
• Developed a promotion flow with integrated tracking and monitoring systems, driving activation success across 15M+ MAU.
• Led the development of a scalable design system using Storybook, ensuring UI consistency and efficiency for 50+ developers.
• Proactively supported 50+ client users, swiftly resolving issues with dedication and effective problem-solving, earning strong positive feedback.
• Maintained and improved 3+ features in Zalo’s Android app, focusing on stability, performance, and seamless user experience for nearly 80 million users.

The company builds a so-called CDxP product. In brief, it is a data platform that tailor-made to host and process customer profiles (the keystone solution is how would you able to identify and unify your customers data from heterogeneous schemas and formats from diverged services and systems).

Key contributions

• Led Front-end team, delivering 10+ projects including CDxP app, Magento & WordPress demos, JS SDKs, mobile SDKs, and more.
• Managed team of 4 members, aligning with product roadmap to satisfy multiple major partners, enhancing UI/UX and implementing advanced features like 360 profiles and campaign builders.
• Developed lightweight JS SDK with full functionalities (<200kb, <150ms load time), facilitating seamless integration across projects.
• Demonstrated rapid problem-solving, ensuring swift feature demonstrations to impress clients and investors.

An out-sourcing company. Most projects revolve around mobile and web apps.

Key contributions

• With expertise in the end-to-end software production process, I led a small team, mastering the phases from requirements gathering to project security, laying the groundwork for future leadership roles.
• Engaging in 8+ diverse projects across education, food and drink, banking, and e-commerce domains, I gained invaluable insights into both web and mobile application development.
• As a project mercenary, I secured significant projects like Savyu and Bank Tool, generating over $20,000 in revenue and earning recognition as the Best Rookie of the Year for my impactful contributions.

A real estate-domain startup. I was one of the founding engineers.

Key contributions

• Initiated involvement in primary web app development as a Front-end Developer. Obtained foundational web development skills, with a specialization in React JS and related technologies. Collaborated on responsive design projects, prioritizing enhancements for user experience.