
Developers at leading digital health companies, from Metabolic clinics to Longevity, use Junction to remotely access granular health data from wearables and lab tests. Junction's platform simplifies the integration and management of API connections with wearables, medical devices, and lab services. From test ordering to results retrieval, Vital handles it all—coordinating across 5,000+ walk-in testing centers, shipping lab kits directly to patients, and scheduling mobile phlebotomist visits. This streamlined process reduces operational burdens, allowing you to focus on delivering high-impact solutions. Junction supports a wide range of healthcare applications, including: - Correlating key biomarkers like HRV and sleep to track recovery progress - Managing chronic conditions with integrated support for blood pressure monitors, CGMs, and wearables - Scaling data collection for clinical trials across a distributed population - Personalizing treatment plans with wearables data and cost-effective specialty lab testing across 50 states Junction helps you access key insights, personalize treatment programs, and improve health outcomes across multiple sectors, all through a single universal API.

Developers at leading digital health companies, from Metabolic clinics to Longevity, use Junction to remotely access granular health data from wearables and lab tests. Junction's platform simplifies the integration and management of API connections with wearables, medical devices, and lab services. From test ordering to results retrieval, Vital handles it all—coordinating across 5,000+ walk-in testing centers, shipping lab kits directly to patients, and scheduling mobile phlebotomist visits. This streamlined process reduces operational burdens, allowing you to focus on delivering high-impact solutions. Junction supports a wide range of healthcare applications, including: - Correlating key biomarkers like HRV and sleep to track recovery progress - Managing chronic conditions with integrated support for blood pressure monitors, CGMs, and wearables - Scaling data collection for clinical trials across a distributed population - Personalizing treatment plans with wearables data and cost-effective specialty lab testing across 50 states Junction helps you access key insights, personalize treatment programs, and improve health outcomes across multiple sectors, all through a single universal API.
What they do: Unified API connecting wearable/device data with nationwide lab testing and collection workflows
Sector: Healthcare diagnostics infrastructure / digital health developer platform
Funding: Raised $18M Series A (announced March 11, 2025) led by Creandum
Scale signals: Supports 300+ device integrations and nationwide lab testing; reported millions of connected devices
Fragmented device data and complex lab logistics for digital health, virtual clinics, clinical trials, and personalized care.
Digital health / Diagnostics infrastructure
$18M
Round includes participation from Y Combinator, Point Nine, Inflect Health, and Amino Collective
“Led by Creandum with participation from prominent early-stage investors including Y Combinator and Point Nine”
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Healthcare is in crisis and the people behind the results deserve better. With data exploding across wearables, lab tests, and patient–doctor interactions, we’re entering an era where data is abundant.
Junction is building the infrastructure layer for diagnostic healthcare, making patient data accessible, actionable, and automated across labs and devices. Our mission is simple but ambitious: use health data to unlock unprecedented insight into human health and disease.
If you're passionate about how technology can supercharge healthcare, you’ll fit right in.
Backed by Creandum, Point Nine, 20VC, YC , and leading angels, we’re working to solve one of the biggest challenges of our time: making healthcare personalized, proactive, and affordable. We’re already connecting millions and scaling fast.
Why we need you
Our small (for now) but mighty 6-person engineering team is tackling big, ambitious problems across wearables and lab testing. We’re already:
Now we’re aiming even higher: going from 4 million lab tests to 40 million diagnostics in the next year. To get there, we need full-stack engineers who can help us build the next version of our diagnostics API.
You don’t need healthcare experience but you do need to:
What you’ll be doing day to day
Requirements
You don’t need to tick every box to fit in here. If the problems we’re solving genuinely interest you and you know you can contribute, we’d love to talk.
How you'll be compensated
Oh and before we forget:
Important details before applying: