Software Engineer - AI

We’re building the next generation of conversational voice and video AI for life sciences—intelligent with 100% regulatory compliance. Our AI medical experts help pharma teams engage doctors, support patients, and unlock insights faster than ever before. We’ve just raised our seed, signed our first customers, and are scaling fast. If you're excited about building real-world AI in an early stage startup and shape not just our product, but our identity and culture —this is your moment. We move like owners. Everyone at SynthioLabs has the autonomy and the responsibility to drive projects, challenge decisions, and push things forward. We don’t wait for permission. If you see a gap, you fill it. If you see a better way, you try it. We ask “why” until we get to the root. We explore new ideas, research papers, every single edge case and anything that sharpens our understanding. We use AI like a second brain. From writing code to writing docs, debugging flows to exploring new ideas, AI is part of our daily rhythm. Everyone here gets hands-on with the tools, learns how to prompt better, and treats AI as a teammate. About the Role Synthio is looking for a hands-on Software Engineer who enjoys building end-to-end systems and shipping production-grade products. This role sits at the intersection of backend engineering, AI systems, and infrastructure. You’ll work on LLM-powered and voice-enabled applications, integrate external APIs, and own services from design through deployment and operation. You’ll join a small, fast-moving team building real-world software for healthcare and pharma, where reliability, performance, and correctness are non-negotiable. We value engineers who take ownership, move quickly, and are comfortable operating across the stack. What You’ll Do Build and maintain backend services that power AI- and LLM-driven products Design and implement APIs, data flows, and service integrations Productionize LLM-based workflows (prompting, retrieval, orchestration, evaluations) Deploy and operate services with a focus on low latency, high availability, and robustness Design and manage infrastructure (containerization, cloud services, CI/CD) Work on voice-enabled systems (STT/TTS, streaming APIs) as part of end-user experiences Monitor, debug, and optimize systems for performance, reliability, and cost Collaborate closely with founders and product stakeholders to turn ambiguous requirements into scalable software Own features and services end-to-end, from initial design to production support What We’re Looking For 1–3+ years of experience in software engineering or backend-focused roles Strong proficiency in Python Experience designing and building APIs and backend systems Hands-on experience working with LLM APIs (OpenAI, Anthropic, or similar) Comfort with cloud infrastructure and DevOps fundamentals (Docker, AWS ECS/EKS/Lambda, observability, basic security) Interest in AI-powered systems, including voice and conversational interfaces Solid systems and architecture thinking, with a pragmatic approach to tradeoffs Ability to work with incomplete specs and make sound engineering decisions independently Why This Role Matters At Synthio, we build software that directly supports patients, physicians, and pharma teams. This is production software, not prototypes or demos. The systems you build will be used in real workflows, under real constraints, and at real scale. You’ll have meaningful ownership and a clear line of sight from your code to real-world impact. Perks Competitive salary Remote-friendly Team offsites in San Francisco