Senior Full Stack Developer (Equity Only | Remote | Flutter + FastAPI)

JR United Kingdom; Leeds; Remote; GBP 60,000 - 90,000; Part time

Job summary

A leading company is seeking a Senior Full Stack Developer to join an innovative project focused on community-driven experiences and AI tools. This equity-only role offers flexible hours and the chance to shape a unique platform. Ideal candidates will have extensive experience in Flutter and Python, thriving in a startup environment.

Benefits

Equity in a high-potential, early-stage company

Flexible hours and remote-first culture

Influence over product and technical direction

Qualifications

• 10+ years of experience, with a minimum of 5+ years in Flutter, Python, AWS.
• Experience in building clean, scalable, production-ready apps.
• Curious, open-minded, and mission-driven.

Responsibilities

• Leading frontend and backend development of the Nanu platform.
• Building scalable features using Flutter and FastAPI.
• Collaborating closely with the founder and lead developers.

Skills

Flutter

Python

AWS

AI

Job description

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Senior Full Stack Developer (Equity Only | Remote | Flutter + FastAPI), leeds, west yorkshire

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Client:

Unknown Systems

Location:

leeds, west yorkshire, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Views:

1

Posted:

25.05.2025

Expiry Date:

09.07.2025

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Job Description:

Job Title:

Senior Full Stack Developer (Equity Only | Remote | Flutter + FastAPI)

Company:

Unknown Systems

Location:

Remote (London-based preferred)

Job Type:

Equity-Only | Part-Time or Flexible Hours

About the Role

Unknown Systems is building Nanu, a groundbreaking platform that investigates unexplained phenomena through community-submitted experiences and AI-powered tools.

We're looking for a Senior Full Stack Developer to join us at a pivotal moment. This is an equity-only role perfect for someone excited by early-stage building, who wants to help launch something truly unique.

You’ll Be Responsible For:

• Leading frontend and backend development of the Nanu platform
• Building scalable features using Flutter and FastAPI
• Collaborating closely with our founder and lead developers
• Contributing to architecture, infrastructure, and product evolution
• Helping shape the future of a global community-driven product

Our Tech Stack:

• Frontend: Flutter (iOS, Android, Web)
• Backend: FastAPI, Python
• Database: PostgreSQL
• Auth: AWS Cognito
• Infra: Redis, Alembic, SQLAlchemy, Pydantic, Pytest
• AI: OpenAI API integrations
• Feed: Multi-factor ranking system for personalised content

You’re a Great Fit If You:

• Have 10+ years of experience (min 5+ with Flutter, Python, AWS)
• Love building clean, scalable, production-ready apps
• Thrive in startup environments and take ownership
• Are curious, open-minded, and mission-driven
• Bonus: experience with AI, community platforms, or content moderation

What We Offer:

• Equity in a high-potential, early-stage company
• Flexible hours and remote-first culture
• Influence over product and technical direction
• A chance to build something that truly matters