Enter a job title or keyword

Senior Applied AI Engineer

Function Health

Job Location:

Austin, TX - USA

Monthly Salary: Not provided by the employer

Posted: 11 July 2026 (30+ days ago)

Application Deadline: 8 October 2026

Vacancies: 1 Vacancy

Department:

Engineering

Job Summary

Company Overview:

Function Health is the AI operating system for health designed to empower people to live 100 healthy years. We are redefining how individuals understand measure and improve their health by moving beyond reactive care and enabling proactive data-driven insight into human biology. Function has been recognized as one of Fast Companys Most Innovative Companies of 2024 and is venture-backed by Andreessen Horowitz (a16z). Hundreds of thousands of members have joined Function to take control of their health.

Through advanced diagnostics deep biomarker testing longitudinal data and AI-enabled insights Function equips members with actionable intelligence to take control of both the quality and length of their lives.

Function recently announced a $298M Series B and is entering its next chapter of growth. As we scale the quality and durability of our People systems data and insights will directly shape our ability to attract retain and support exceptional talent.

We are growing our team and seeking out world-class talent that deeply believes in our mission to positively impact global health has a relentless bias toward action and a growth mindset. Function fosters a collaborative and dynamic environment where every day we build the future.

Role:

We sit on something rare: a fast-growing longitudinal health dataset spanning 50M lab tests 160 biomarkers per member advanced imaging and wearable signals captured continuously rather than once a year at a checkup.

Youll own the agentic system that turns a members health data into clear next steps working alongside their clinicians. Day to day that means building and operating production multi-agent systems end to end: orchestration graphs tool use and memory retrieval over a members records and the evals and observability to keep it reliable. Youll wire frontier LLMs into Functions proprietary data and hold the whole thing to the safety latency and cost controls healthcare demands.

This is a hands-on high-ownership role for an engineer who has built agents at scale and wants their work measured in healthy years of human life not just benchmarks.

Impact Youll Drive:

Put a concierge doctor in every members pocket: an agent that reasons over a lifetime of labs imaging and wearable signals and tells them what to do next.
Turn our longitudinal health dataset into decisions not dashboards so members act on their health rather than just view it.
Make health AI that people trust with their lives: every recommendation earns its way past evaluation gates and clinician review before it reaches a member.
Catch what a once-a-year physical misses surfacing the early signal across 160 biomarkers before it becomes a diagnosis.

Key Responsibilities:

Architect and build stateful graph-based agent workflows with tool use planning and memory.
Integrate LLMs and multimodal models via structured I/O (JSON Schema Pydantic validators) and function/tool calling.
Build high-reliability APIs and streaming services for real-time inference speech and vision.
Own production readiness: tracing logging metrics rate limiting circuit breakers and SLOs
Stand up eval pipelines: offline golden sets LLM-as-judge with human rubrics online A/B and regression tests in CI.
Implement retrieval and memory: hybrid search vector and graph retrieval semantic caches and long-horizon context.
Optimize cost/latency: model routing prompt and tool selection quantization and KV cache/prefill strategies.
Partner cross-functionally to translate research into robust production systems and iterate quickly behind evaluation gates.
Mentor engineers through design docs and architecture decisions.

Qualifications/Skills:

To excel in this role candidates must bring a unique combination of skills and experiences:

1 years building agentic AI systems; 6 years as a full-stack or ML engineer building production backends or ML systems in Python Go or similar.
Fluency with agentic orchestration (e.g. LangGraph PydanticAI DSPy LlamaIndex) and tool/function calling.
Experience integrating frontier LLMs and multimodal models via managed APIs or self-hosted serving.
Strong with API design and backend frameworks (FastAPI Flask) and event-driven architectures.
Data systems expertise with PostgreSQL including token streaming and throughput tuning.
Retrieval and memory: vector databases (pgvector Pinecone Weaviate Milvus) hybrid search and graph/knowledge storage.
Production evals: LLM-as-judge human-in-the-loop rubric design and CI-integrated regression tests.
Observability and SRE: OpenTelemetry traces metrics structured logs SLOs dashboards and on-call triage.
Cloud-native delivery: Kubernetes Terraform Docker GPU scheduling/autoscaling on AWS or GCP.
CI/CD proficiency with GitHub Actions and test automation for prompts tools and agents.
Clear concise communication and high ownership in fast-paced environments.

Nice to Haves:

Real-time multimodal systems: streaming ASR low-latency TTS WebRTC and vision pipelines.
RAG expertise beyond basics: Graph RAG multi-hop retrieval sub-agents query planning and freshness policies.
Safety and governance: policy-as-code red-teaming PII handling audit logs and role-based tool authorization.
Regulated data experience (HIPAA SOC 2 GDPR) and data residency controls.
Personalization at inference time long-term memory agents session state and episodic memory stores.
Experience with consumer-scale AI apps high-traffic systems or on-device/edge acceleration (WebGPU).

To be a strong fit you also need:

Ruthless Prioritization:
- We dont let perfect get in the way of progress.
- We move quickly to drive value not perfection.
- We prioritize what drives impact.
- We never compromise on standards of excellence.
Member-First Always:
- We design and deliver like were caring for someone we love.
- We create calendar actionable human experience.
- We prioritize responsiveness peace of mind and outcomes.
- We empower members with truth clarity and care.
One Team Moving Fast:
- We are aligned in purpose prioritization and speed.
- We gather diverse perspectives to make informed decisions.
- We clear paths for each other and move fast together.
- We communicate clearly and respectfully rallying around shared goals.
Radical Ownership Relentless Execution:
- We dont just ship we own outcomes and drive results.
- We act with urgency and precision
- We anticipate initiate and follow through.
- We meet challenges with grit and pragmatism.
- We embrace new tech to deliver better outcomes.
Mission Over Ego:
- We are ruthlessly aligned to our mission - and leave ego at the door.
- We disagree and commit.
- We dont tolerate politics or withholding information.
- We operate with honesty transparency and respect.
Sustained Integrity in Every Detail:
- We earn trust by obsessing over accuracy quality and clarity in everything we do.
- We prioritize clinical precision - data must be right.
- We sweat the details because outcomes depend on them.

Your dedication to these responsibilities will directly contribute to the success of our platform and the satisfaction of our users. We are looking for a proactive skilled and forward-thinking individual to join our team and help shape the future of our services.

Why Youll Love Working With Us:

We value our team at Function and offer a competitive salary and benefits package flexible working hours and a dynamic work environment where creativity and innovation are encouraged. If you are a highly motivated and experienced individual who is passionate about using technology to improve peoples lives we would love to hear from you.

At Function we celebrate diversity and are committed to building a diverse and inclusive workforce. As an equal opportunity employer we do not discriminate on the basis of race color gender identity ancestry religion age sexual orientation national origin disability marital status Veteran status or any other occupationally irrelevant criteria.

Join the Function Health team and become a part of our mission to build a healthier future for all. Discover more about us and how were changing the face of healthcare at Function Health.

Important Notice: Legitimate communication from the Function Health team will always come from an email address ending in @. Function Health will never request personal information such as banking details or payment during the hiring process. Please be cautious of communications or job offers that come from other email domains instant messaging platforms or unsolicited calls. If you ever have doubts about the legitimacy of a communication please reach out to us directly at

Required Experience:

Senior IC

Apply Now