Back End Developer

Company DescriptionHello Recruiter is an AI-powered recruiting platform that conducts autonomous conversational interviews using intelligent digital avatars. Our AI agents conduct in-depth interviews across chat, voice, and video—giving every candidate a fair, consistent experience while saving recruiters hours of screening time. We're an early-stage startup building at the intersection of AI and recruiting.Role DescriptionWe're looking for a Backend Engineer to build and scale the systems that power our AI interview platform. You'll work on everything from our core API and data layer to AI orchestration, real-time communication infrastructure, and third-party integrations. This is a high-ownership role where your decisions will directly shape our architecture as we grow.If you're excited about building systems that coordinate multiple AI models, handle real-time audio/video, and process thousands of interviews—this is the role.What You Will DoDesign, build, and maintain APIs and backend servicesBuild and optimize our AI orchestration layer (routing between Claude, GPT-4, Gemini based on use case)Develop integrations with voice AI systems (speech-to-text, text-to-speech)Work on real-time infrastructure for live interviews (WebSockets, event-driven systems)Build and maintain our ATS backend (job pipelines, candidate workflows, automation rules)Design database schemas and optimize queries for performanceImplement background job processing for async tasks (resume parsing, interview analysis, notifications)Build integrations with third-party ATS platforms (Greenhouse, Lever, Ashby)Write secure, tested, and well-documented codeParticipate in architecture discussions and code reviewsSet up monitoring, logging, and alerting for production systemsWhat We Are Looking ForMust Have:2+ years of professional backend development experienceStrong proficiency in backend technologies like dotnet, java or ruby on railsExperience designing and building RESTful APIsSolid understanding of relational databases (MS SQL or PostgreSQL preferred)Understanding of authentication and authorization (JWT, OAuth)Familiarity with cloud infrastructure (AWS, GCP, or Azure)Experience with Git and collaborative development workflowsAbility to debug production issues and think systematicallyGood communication skills in EnglishSelf-motivated and comfortable working independently in a remote environmentGood to Have:Experience integrating with LLM APIs (OpenAI, Anthropic, Google)Familiarity with real-time systems (WebSockets, WebRTC, event-driven architecture)Knowledge of message queues (RabbitMQ, Kafka, SQS)Understanding of CI/CD pipelinesPrevious startup experience or comfort with fast-moving environmentsInterest in AI/ML and how LLMs workTech StackLanguages: Python, dotnetDatabase: MS SQL, PostgreSQL, Redis, Azure StorageAI: Gemini, Open Router, Anthropic Claude, Cartesia, LiveKit, Vapi, LangfuseInfrastructure: AzureVersion Control: Git, GitHubWhat We OfferOwnership and impact from day one—small team, big responsibilityWork on a product at the cutting edge of AI and recruitingFlexible remote work with async-friendly cultureDirect collaboration with founders and senior engineersRoom to grow as the company scalesWhat We ExpectYou ship. We value working software over endless discussions.You take ownership. If something's broken in your area, you fix it without being asked.You communicate proactively. Remote work requires over-communication, not silence.You're pragmatic. Perfect is the enemy of done—but you know when quality matters.You're curious. Our product touches AI, voice, video, and real-time systems. You don't need to be an expert in all of them, but you should want to learn.

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