Lead Software Engineer, iOS, Zalo
Full-time
Rolled out in 2012, Zalo has proved itself as the leading instant messaging app in Vietnam with more than 70 million monthly active users. We develop a messaging application that provides fast, stable, convenient, and private connection for users anytime, anywhere.
🤖 What you will do
- Define and drive the iOS platform strategy: own architectural decisions across modularization, dependency management, build systems, and shared frameworks used at scale across teams;
- Build and evolve core platform foundations: design, develop, and maintain internal SDKs and reusable libraries powering all iOS products;
- Lead modular architecture transformation: shape a scalable, maintainable codebase by defining module boundaries, enforcing dependency rules, and enabling team autonomy;
- Own the iOS build & release ecosystem: optimize build performance, manage CI/CD pipelines, code signing, and release automation to ensure fast and reliable delivery;
- Ensure platform reliability and performance excellence: drive initiatives across app launch time, memory footprint, crash rate, and system stability;
- Continuously modernize the platform: lead iOS, Xcode, and Swift migrations while proactively addressing toolchain and compatibility challenges;
- Set and enforce engineering standards: establish best practices in architecture, code quality, security, and development workflows across teams;
- Elevate developer experience (DevEx): build internal tooling (templates, code generators, linters, documentation) to maximize engineering productivity;
- Act as a technical leader and mentor: guide engineers on system design, iOS internals, concurrency, and debugging in production environments;
- Collaborate cross-functionally: serve as the key technical bridge between iOS, Backend, QA, DevOps, Security, and Product teams;
- Explore and adopt emerging technologies: evaluate new Apple frameworks and define adoption strategies aligned with business needs.
👾 What you will need
- 5+ years of iOS development experience, with deep expertise in both Objective-C and Swift, including large-scale, production-grade systems;
- 2+ years in a technical leadership role (Tech Lead, Senior / Lead Developer) on a large iOS codebase;
- Strong understanding of iOS internals: app lifecycle, memory management, concurrency, and runtime behavior;
- Advanced knowledge of concurrency models (Grand Central Dispatch, Swift Concurrency) and thread safety;
- Hands-on experience with modularization and large-scale build systems;
- Deep expertise in modern iOS architecture patterns (MVVM, Clean Architecture) with the ability to evaluate trade-offs;
- Strong background in performance optimization: profiling, debugging, and improving app performance at scale;
- Solid understanding of iOS security and privacy standards, including secure data storage and network communication;
- Proficiency in CI/CD pipelines, code signing, provisioning, and automated release processes;
- Strong experience with UIKit (and familiarity with modern UI frameworks is a plus);
- Excellent communication skills: able to write clear technical documents, lead design discussions, and influence stakeholders;
- Passion for mentorship and engineering excellence, with a track record of growing high-performing teams;
- High ownership mindset, pragmatic decision-making, and a strong focus on impact.
