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

Unknown Systems

London

Remote

GBP 60,000 - 90,000

Part time

2 days ago

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Job summary

A leading company is seeking a Senior Full Stack Developer for an equity-only role to help build Nanu, a platform focused on unexplained phenomena. This remote position offers flexible hours and the chance to shape a community-driven product with a significant impact.

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, and AWS.
Experience in building clean, scalable, production-ready apps.
Curiosity and mission-driven mindset.

Responsibilities

Lead frontend and backend development of the Nanu platform.
Build scalable features using Flutter and FastAPI.
Collaborate closely with the founder and lead developers.

Skills

Flutter

Python

AWS

Tools

FastAPI

PostgreSQL

Redis

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

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

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

Seniority level

Seniority level
Mid-Senior level

Employment type

Employment type
Other

Job function

Job function
Engineering and Information Technology
Industries
Software Development

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