Senior Software Engineer

Synthio Labs 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.

Responsibilities:

• 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 optimise 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.

Requirements:

• 2-5 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.