Actogram https://actogram.ai/ is developing next-generation wellness technology for the watchmaking and longevity industry.

Our patent-pending circadian rhythm analysis algorithm is designed for ultra-low-power LCD and quartz watch calibres, operating on as little as 15 µA. This breakthrough enables timepieces to track and display a wearer’s natural biological rhythms — bringing health-focused and longevity-oriented features into watches for the first time.

We are currently engaging with LCD watchmakers, advanced smartwatch brands, sports & outdoor equipment companies, and longevity-focused businesses seeking medical-grade wearable analytics.

Role Overview

We are looking for a Full Stack Prototype Developer to join our small, fast-moving team. This is a hands-on role:

• Phase 1 starts with rapid prototyping of new Actogram features.
• Then you will coordinate with outsourced development teams to transform prototypes into a fully functional Software Development Kit (SDK) ready for integration into watches and wearable devices.

Arrangement & Contract

• Phase 1 (1 month): PDF-report generation from dashboard, server integration to process JSON from HealthKit data.
• Phase 2 (3 months): iOS HealthKit extractor app, server-side processing, updated dashboards, AI chatbot prototype, Figma UI finalisation.
• Phase 3 (1 year): Product scaling, Android version, C-based SDK for watches, ongoing feature development & client integrations.

📍 Preferably based in Barcelona

🏢 Workplace: The Social Hub (onsite)

💻 Corporate notebook provided

Responsibilities

• Convert Python data-science scripts into SDK and server-side APIs to process wearable activity data in near-real time.
• Manage UI/UX workflows in Figma and oversee asset integration.
• Maintain repository structure and code documentation.
• Suggest and implement technical optimisations for speed, accuracy, and battery efficiency.
• Review and coordinate work of outsourced developers (code quality, performance, SDK implementation).
• Conduct testing and debugging for prototype and SDK.

Technology Requirements

• Full-stack development: Python, JavaScript/TypeScript, REST APIs
• Frontend frameworks: React (or similar), dashboard libraries
• iOS development: Swift/SwiftUI, HealthKit integration
• Backend: AWS (Lambda, EC2, S3) or Azure equivalent
• Data handling: Pandas, NumPy, JSON, file compression
• Version control: Git/GitHub

Nice-to-have:

• PDF report generation (pdfkit, ReportLab)
• AI chatbot integration (OpenAI API)
• Wearable sensor data processing
• C-based SDKs for ultra-low-power watch microcontrollers.
• Embedded systems/C programming, BLE integration
• UI design experience in Figma

Competencies

• Ability to work independently and manage projects end-to-end.
• Strong rapid prototyping mindset.
• Interest in wearable tech, wellness, or watchmaking.