# Senior Software Engineer @ Upfirst

• - Voice AI agents: real-time call handling with OpenAI Realtime and ElevenLabs; LLM tasks on OpenAI and Gemini.
• - SMS auto-reply engine for AI agents: debounced conversations, LLM decisions and escalation, STOP/HELP compliance and Telnyx 10DLC registration.
• - Billing on Stripe: plans, add-ons and quantity that follows the number of agents.
• - Calendar integrations for booking, and a shared inbox for calls and chats.
• - Platform: TypeScript microservices on GCP (Pub/Sub, Cloud Tasks) provisioned with Pulumi, observed with OpenTelemetry and Sentry.
• - AI-assisted engineering: Claude Code agents and skills for planning, code review and browser QA.