Back-end Product Engineer

Job Role: Product Engineer (backend C# .net core) Reference: BH-355p Job Type: Permanent Location: Hybrid, West Hampstead, London (2 days/week in-office) Our client builds AI-driven voice automation for regulated industries, helping companies reduce costs while meeting strict compliance standards. We’re hiring on behalf of our client for a Product Engineer (backend C# .net core) to join their growing team. The role will focus on backend development for a platform that blends telephony, voice AI, and LLMs to create next-generation voice automation features. You’ll play a key role in building core product functionality, from low-latency backend services to real-time communications and third-party integrations. If you’re proactive, technically strong, and excited about building high-impact systems in a startup environment, this role is for you. Navigate ambiguity and working with minimal supervision. Develop and maintain backend services using C# and .NET Core. Write performant SQL for PostgreSQL databases; help design schemas and queries. Build clean automation tests (unit, functional, API). Assist with deployment using Docker (containerisation) and AWS (EC2, RDS). Integrate with telephony and AI services like Twilio, ChatGPT, and ElevenLabs. Maintain compliance and security in systems handling sensitive financial or personal data. 5+ years of software engineering experience. ~ Proven backend experience with C# (.NET Core) in Linux-based production environments. ~ Comfortable navigating ambiguity and working with minimal supervision. ~ Strong SQL knowledge, with experience using PostgreSQL in live systems. ~ Familiarity with Docker and AWS services, from a developer perspective. ~ Comfortable with building lightweight frontends in Blazor or similar. ~ Previous work in financial services, healthcare, or similarly regulated data environments. Experience with LLMs, voice agents, or tools like AWS SageMaker, AWS Bedrock, or ElevenLabs.