Technical Leader (E2EE Messaging Platform)

About the Role
We are seeking an exceptional, hands-on Technical Lead to own the overall technical architecture and engineering execution of our flagship, high-security communication and real-time messaging product.
In this pivotal role, you will serve as the core technical authority across our multi-platform product ecosystem-spanning Backend Services, High-Performance Shared Core SDKs,
Native iOS (Swift), Web/Desktop Apps (React & Electron), Database Systems, E2EE
Security, and Cloud Infrastructure.
You will bridge product vision with deep technical execution, driving architectural governance, mentoring multi-disciplinary engineering leads, and ensuring our cross-platform architecture achieves peak performance, high concurrency, seamless client synchronization, and ironclad security.
Key Responsibilities
End-to-End System Architecture: Define, evolve, and maintain the cross-platform
technical architecture across Backend Services, Shared Core Logic, Native iOS, Web, and
Electron Desktop clients.
Shared Logic & Cross-Platform Governance: Architect and govern the integration of
shared core libraries across Native iOS (Swift) and Web/Desktop (React/TypeScript &
Electron) runtimes to minimize duplicated business logic and ensure strict state
consistency.
Technical Standards & Design Sign-off: Lead the drafting, review, and approval of
Technical Design Documents (TDDs) for core platform modules, real-time protocols,
local offline storage, and complex security features. Establish strict CI/CD and automated
testing pipelines.
Hands-on Delivery & Performance Optimization: Tackle complex system bottlenecks,
profile memory/CPU footprints on desktop (Electron) and mobile (iOS) environments,
optimize database persistence, and resolve critical production incidents.
Cross-Functional Collaboration: Partner closely with Product Managers, UX
Designers, and Client/Backend Leads to evaluate feature feasibility, refine API contracts,
and deliver smooth, high-concurrency real-time messaging flows.
Team Leadership & Mentorship: Mentor and empower Senior Engineers across
backend, iOS, Web/Desktop, and infrastructure. Build a culture of engineering
excellence, ownership, and continuous technical improvement.
Qualifications & Requirements
1. MUST HA VE
Technical Leadership Experience: 7+ years of hands-on software engineering
experience with at least 3+ years in a Technical Lead, Principal Architect, or Full-System
Engineering Lead role managing multi-platform technical teams.
Multi-Platform Product Exposure: Proven experience overseeing products deployed
across Native Mobile (iOS/Swift), Web (React/TypeScript), and Desktop (Electron)
environments.
Backend & Real-Time Architecture: Solid background in designing scalable backend
services (Go, Python, C/C++, [protected info], or Java) and real-time protocols (WebSockets,
Async Data Sync, Event-Driven platforms).
Architecture Governance: Strong history of drafting, reviewing, and approving
Technical Design Documents (TDDs), defining clean API contracts, and establishing
CI/CD automation pipelines.
Ownership & Problem Solving: Demonstrated track record of unblocking engineers,
handling production incidents, and balancing business trade-offs with technical debt.
2. SHOULD HA VE (Strongly Preferred)
Systems Programming & FFI Awareness: Hands-on experience or deep understanding
of low-level/systems languages (Rust, C/C++) and cross-platform compilation (FFI,
WebAssembly, or C-bindings).
Desktop Performance (Electron): Experience profiling and optimizing Electron
applications (IPC communication overhead, renderer thread optimization, main process
memory management).
Security & Encryption Standards: Solid understanding of modern cryptography, local
data encryption, End-to-End Encryption (E2EE) protocols (e.g., Signal Protocol,
Olm/Megolm), and OWASP security standards.
Cloud Infrastructure & DevOps: Working knowledge of AWS/GCP, Docker,
Kubernetes, infrastructure-as-code (Terraform), and monitoring systems (Prometheus,
Grafana, ELK).
3. GREAT TO HA VE (Bonus Points)
Matrix / Element X Stack Experience: Practical experience or familiarity with the
Matrix open protocol, Matrix Rust SDK, Synapse/Dendrite homeservers, or Sliding
Sync Proxy.
Dual Native Mobile Stack: Working knowledge or cross-compilation experience
extending to Android (Kotlin/Jetpack Compose) in addition to iOS.
Open Source & Crypto Contributions: Active contributions to open-source systems
libraries, messaging frameworks, Electron plugins, or security/crypto projects.
Security Audits: Experience undergoing third-party security audits/penetration tests or
performing binary/memory profiling.Technology Stack Summary
Backend: Go, Python, [protected info], PostgreSQL, Redis, Docker, Kubernetes, AWS/GCP.
Core / Shared SDK: Rust / C++ / Systems Programming, FFI, WebAssembly, SQLite.
Clients: Native iOS (Swift / SwiftUI), Web (React / TypeScript), Desktop (Electron).
Security: E2EE (Olm / Megolm / Signal Protocol), PKI, OAuth2.