Senior Software Engineer

ABOUT HIYA At Hiya, we're making calls safe, useful, and human again. Voice is the most human form of communication, yet it's become one of the least trusted. Spam, scams, and AI manipulation have eroded what was once a simple way to connect. Each month our AI voice technology analyzes 28+ billion calls, protecting over 550 million users and 800+ businesses worldwide. Partnering with a growing global network including, AT&T, Samsung, British Telecom EE, Rogers, MasOrange,Bell Canada, MasMovil, and Virgin Media O2, we're not just stopping bad actors, we're helping people feel good and confident about picking up the phone again. This is a pivotal moment for voice. As new threats and technologies accelerate, so does demand for trusted voice communication. Hiya is growing 40%+ year over year, expanding globally, and defining what voice becomes next. Join us. You won't just work on what voice is today, you'll shape what it becomes tomorrow: smarter, safer, and genuinely worth answering again. ABOUT THE ROLE The Communications Platform team builds and operates the infrastructure layer that powers Hiya's consumer products — Hiya AI Phone and Hiya Spam Blocker — as well as the carrier partnership integrations that are central to Hiya's growth. We own the voice platform, mobile SDKs, and the tooling that validates our intelligence platform works correctly across carrier networks worldwide. This is a role for someone who gets energy from variety and impact. You'll work across the full width of the platform — backend services, mobile SDKs, AI pipelines, DevOps — rather than going deep on one narrow problem. You're strong in at least one language and comfortable picking up others. You move fast, ship reliably, and communicate clearly when something needs attention. The growth path here is real. You'll start with well-scoped work where you can prove your judgment and build context quickly. As you do, you'll take on broader ownership — shaping what gets built, not just how — and grow toward a senior engineering role on a team where that progression is expected, not exceptional. WHAT YOU'LL DO - Own voice platform backend services that make Hiya's voice intelligence work at scale — handling real-time call flows, carrier integrations, and VoIP infrastructure, with increasing exposure to AI-powered pipelines (STT, TTS, LLM) that drive our AI agents, consumer products, and carrier deals - Build and evolve testing and validation tooling that gives Hiya confidence before a single real call is made in a new market — simulating calls, gathering results across real devices globally, and enabling the team to expand into new carrier networks without guesswork - Drive delivery on Android and iOS SDK improvements that keep our platform connected to products and partners — shipping features, improving call quality metrics, and building the reliability that partners depend on - Operate across the full stack with increasing autonomy — starting with well-scoped execution work and growing into end-to-end ownership of systems, features, and decisions as you build context and demonstrate judgment WHAT SUCCESS LOOKS LIKE - The voice platform is reliable, performant, and world-class — powering AI agents, consumer products, and carrier integrations with call quality that users and partners can depend on - New market launches go live cleanly, with validation tooling that gives the team confidence before a single real call is made - SDK partners can ship the features they need without waiting months for support - You've built enough context across the stack that you can independently identify problems, propose solutions, and drive them to completion — early on that means executing well-scoped work with quality and reliability; over time it means shaping what gets built, owning areas end to end, and operating at the level of a senior engineer WHAT WE'RE LOOKING FOR Required: - 3+ years of professional software engineering experience - Strong depth in TypeScript or P