Engineer health

Xenios Technologies, Inc. · Remote (US) · Contract → Full-Time · Paid + Founding Equity

The work. Xenios is building the AI-native operating system for the proactive-health professional. Three commercial surfaces. One ontology. One regulated clinical chain. The professional pays. Their clients live inside it. One coach now serves 200 clients instead of 20.

The platform is event-driven and agentic. Five input types — messages, heartbeats, crons, hooks, webhooks — feed a task queue processed by specialized AI agents with persistent state. Architecture is settled. Modules need owners.

The founding engineer owns a major module end-to-end. From a blank repo to live production. Modules include:

• Agent orchestrator — 15,000+ daily tasks across specialized agents, persistent state, tool routing
• Coach personality system — clones a professional's voice and judgment into structured prompts and reusable agent definitions
• Client experience platform — the consumer-side companion layer
• Real-time form-feedback pipeline — MediaPipe BlazePose, on-device, 30 FPS
• Multi-channel communication engine — in-app, SMS, WhatsApp, email, with safety guardrails and escalation logic
• Migration agents — pulling working coaches off Trainerize, TrueCoach, Healthie, Everfit in under 72 hours
• FHIR R4 clinical surfaces — Patient, Observation, MedicationRequest, CarePlan, DiagnosticReport for the enterprise tier

About the team. Founding team includes a CTO with two prior healthcare-tech exits totaling $710M+, an MD cofounder with 30,000+ patient prescribing history and clinical leadership through a $1.6B SPAC, and a founding bench spanning performance science, clinical operations, product, and operator-side experience across coaching, healthtech, and consumer. Pre-seed with named angel capital closed and MVP build active right now.

How the team builds. Build-to-Learn philosophy. Problem brief → proof of concept → domain expert review → refined spec → production. Working prototypes are specs that run. If the instinct is to wait for a perfect PRD before opening an editor, this is not the right seat. If the instinct is to turn ideas into production systems on Day 1, this is the right seat.

Founding engineers write machine-ready PRDs (working POC code + acceptance criteria + schemas + verification plans). Run Discovery Builds (research a domain, validate with a domain expert, ship). Ship Feature Sprints (well-scoped features in 1-3 days using Claude Code). Communicate asynchronously — learning logs over status meetings.

Stack. Go + TypeScript backend. Supabase + PostgreSQL + pgvector + row-level security. React + Next.js 16 + Tailwind v4. React Native (Expo). Anthropic Claude (Opus 4.7 / Sonnet 4.6) + MCP server architecture. Deepgram + MediaPipe BlazePose. Vercel + Fly.io. Twilio, Stripe + Stripe Connect, Resend, SendGrid. Apple HealthKit, Google Health Connect, Terra. Cursor + Claude Code in the dev workflow with a living CLAUDE.md.

Who fits. Built a production-grade platform from scratch — blank repo to live system serving real users. Thinks in systems: scalability, reliability, security at every layer. Fluent in AI-assisted development without losing engineering rigor. Security-first: HIPAA, SOC 2, OWASP Top 10 from Day 1. Database-first: models in Postgres with real schemas, constraints, and migrations. Tackles the hardest 10% of every problem first — auth, encryption, audit trails, load reliability.

Bonus: agentic AI platforms in production. Health, fitness, or clinical product experience. Supabase / Fly.io / Vercel. HIPAA / SOC 2 frameworks. Real-time video or computer vision. Prior founding-engineer experience.

Compensation. Competitive market-rate cash compensation, paid in 4-week cycles from start date. Founding-level equity grant with 4-year vest, 6-month cliff. 30-day reassessment after start. Final cash terms set at offer based on scope and time commitment. Full-time transition available as the company scales.

Apply — email [email protected]

Subject line: Founding Engineer — Xenios

Include: resume or LinkedIn + GitHub or portfolio + one paragraph on a platform built from scratch + why Xenios specifically. The founding team responds to every serious applicant within 48 hours. Bonus points if you've shipped event-driven systems, worked with LLM APIs in production, or built AI-powered coaching/health/fitness products.

Screening — yes/no:

• Built a production platform from scratch
• Designed and deployed event-driven architectures
• Worked with LLM APIs in production
• Proficient in Go, TypeScript, or comparable
• Postgres schema design experience
• Cloud + CI/CD experience
• Comfortable in a founding-role, pre-seed environment
• Can commit 30+ hrs/week with transition to FT
• Open to paid + equity compensation
• Currently authorized to work in the United States on a permanent basis, without current or future employer-sponsored work visa

xeniostechnology.com · linkedin.com/company/officialxenios · instagram.com/officialxenios

Xenios Technologies is an equal opportunity employer. We do not discriminate on the basis of race, color, national origin, ancestry, religion, sex, gender identity, sexual orientation, age, disability, veteran status, or any other characteristic protected by applicable law. The work-authorization requirement above is solely because we are not able to sponsor employment visas at this stage.

Pay: From $140,000.00 per year

Application Question(s):

• Have you worked in a startup or fast-paced product environment?
• Do you have experience designing AI-powered or data-driven applications?
• Are you willing to accept an equity-based role at the pre-seed stage?
• Will you be able to transition into a salaried role following a successful fundraise?
• Are you currently authorized to work in the United States without present or future employer sponsorship?
• Have you built a production-grade platform from scratch?
• Do you have experience designing and deploying event-driven architectures?
• Have you worked with LLM APIs or AI-powered applications in production?
• Are you proficient in Go, TypeScript, or a comparable backend language?
• Do you have experience with PostgreSQL and database schema design?
• Do you have experience with cloud platforms, CI/CD pipelines, and scalable infrastructure?
• Are you authorized to work in the United States without present or future employer sponsorship?
• Are you able to put in 30 hours a week minimum?

Work Location: Remote