Senior Software Engineer

About the role

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. Hiya is changing that. 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. Hiya is hiring a Senior Software Engineer to join the Protect team, responsible for building and scaling the AI-powered spam and scam detection systems that protect hundreds of millions of people from fraudulent calls before they ring. As voice threats evolve faster than ever; driven by AI-generated abuse, sophisticated spoofing, and increasingly complex attack patterns. You'll own the end-to-end pipeline that enables our data science team to develop increasingly sophisticated scam detection models while maintaining strict privacy and regulatory compliance. It's all about building the pipelines that allow Hiya to stay ahead of rapidly evolving voice threats and deliver measurably better protection to mobile operators and their subscribers worldwide. You'll shape how protection scales across our network, how quickly we adapt to new threats, and how effectively we translate AI innovation into real-world safety outcomes.

Responsibilities

• Own the complete development lifecycle for spam and scam detection infrastructure - from researching and proposing solutions to implementation, testing, deployment, production maintenance, and monitoring
• Participate in on-call rotation, ensuring rapid recognition and resolution of production issues while continuously improving system reliability
• Design and build frameworks that enable data scientists to develop, test, and deploy increasingly complex scam detection models with access to call data in a privacy-aware, regulation-compliant manner
• Make independent implementation decisions while driving collaborative design discussions that improve system quality, long-term maintainability, and cost-effectiveness across the team
• Evaluate critical tradeoffs between immediate fixes and durable solutions when production issues arise, prioritizing overall service quality and system resilience
• Collaborate proactively with cross-functional partners - including product managers, data scientists, and other engineering teams - to align technical decisions with business impact, user needs, and Hiya's broader strategic priorities
• Recognize and evangelize engineering patterns, design principles and architectural decisions that could be adopted across teams to raise overall quality and execution speed
• Influence how the team operates by pushing back on solutions that don't align with design principles, surfacing issues early during project planning, and reasoning clearly about business impact versus cost

Requirements

• Required
• 4+ years of software engineering experience, with strong expertise in distributed systems, microservices, network architecture, and database systems
• Proven experience operating distributed systems in production environments
• Ability to quickly recognize, diagnose and resolve production issues
• Relevant technical experience may include:
• RxM engineering
• TCP/IP
• DNS resolution
• Web backend development
• Ability to evaluate tradeoffs between immediate fixes and long-term solutions
• Strong focus on service quality, reliability and system resilience
• Ability to work independently on implementation while knowing when to involve others in design discussions
• Confidence making well-informed technical decisions and clearly explaining tradeoffs
• Interest in agentic workflows, including engineering automation and customer-facing applications
• Preferred
• 6+ years of software engineering experience
• Experience building frameworks or infrastructure that support data science or machine learning workflows
• Functional programming experience
• Experience with data processing pipelines, especially Kafka or similar technologies
• Familiarity with client-side processing pipelines
• DevOps, monitoring, and observability experience
• Familiarity with on-call rotation
• The person in this role must embody Hiya's key values of Serving our customers, Doing rather than observing, Improving ourselves and our business, Owning and holding ourselves accountable for success, an

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