Senior Developer

About us Wazo builds programmable, API-first communication infrastructure and applications. We power unified communications at the infrastructure level: real-time systems, SIP signaling, WebRTC, media flows, distributed services, and high-availability architectures and applications based on those. This is not feature-layer work. This is mission-critical telecom infrastructure. Our Hiring Philosophy We hire systems engineers who can reason about complex, evolving environments. We expect strong depth in at least one domain, and the curiosity to operate beyond it as the system demands. If you prefer working strictly within a single framework or language, this role may feel constrained. Our current environment includes: Backend services primarily in Python Mobile core in Kotlin and Swift Real-time infrastructure components across multiple technologies Familiarity matters less than your ability to learn quickly, write maintainable systems code, and protect operational integrity . Technology choices evolve. System thinking does not. The Role You will work on: SIP / VoIP signaling RTP media flows Distributed backend systems Event-driven architectures Low-level networking and performance-sensitive components AI-augmented engineering workflows You will contribute across layers — from protocol handling to API orchestration. You will own: Architecture : clean interfaces between protocol handling, media, and API layers Reliability & operability : instrumentation, debugging, incident follow-ups, hardening Performance : latency, throughput, resource usage, media path efficiency AI-Native Engineering We operate with an agent-centric model. AI is used to accelerate execution (drafts, refactors, tests, runbooks), but humans own correctness . You will provide direction, constraints, validation, and long-term coherence. You will set constraints, review outputs critically, and ensure changes align with long-term architecture. AI assists with drafting, refactoring, tests, and documentation. The bottleneck is judgment. We are looking for engineers who can supervise quality, protect architectural integrity, and make sound trade-offs at scale What We’re Looking For 10+ years of professional experience (6–10 considered for exceptional system-level profiles) Strong system thinking is required Experience in distributed or real-time systems Comfort near infrastructure layers Autonomous, high-ownership mindset Product awareness Telecom experience is a plus. Systems thinking is essential. Engineering school background Based in Canada between Ontario and East Coast as the company is between Europe and North America Compensation & Benefits Compensation and benefits for this role are calibrated against the specific local market standards to ensure competitive alignment with regional cost-of-labor and talent benchmarks We reward depth, ownership, and architectural impact. Benefits offered Comprehensive benefits package covered by the employer Competitive salary 4 weeks of vacation + comfort days Remote work Friendly culture with great opportunities to make an impact on a growing global team. Why Join Fast growing and changing environment AI-native engineering model Infrastructure-level challenges High autonomy Senior, high-density team If you value judgment, system integrity, and meaningful technical impact — we should talk. -------------------------------------------------- À propos de nous Wazo construit une infrastructure et des applications de communication programmables, API-first. Nous opérons les communications unifiées au niveau de l’infrastructure : systèmes temps réel, signalisation SIP, WebRTC, flux média, services distribués, et architectures hautement disponibles ainsi que les applications qui en découlent. Il ne s’agit pas de développement de fonctionnalités en surface. Il s’agit d’infrastructure télécom critique. Notre philosophie de recrutement Nous recrutons des développeurs systèmes capables de raisonner dans des environnements complexes et e