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

JR United Kingdom; Leigh; Remote; GBP 60,000 - 100,000; Part time

Job summary

A leading company is seeking a Senior Full Stack Developer for an equity-only, remote role to help launch a unique platform investigating unexplained phenomena. This pivotal position involves leading development efforts, building scalable features, and influencing product direction 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 in software development.
• Minimum 5+ years with Flutter, Python, and AWS.
• Experience with AI, community platforms, or content moderation is a bonus.

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

Tools

PostgreSQL

Redis

FastAPI

AWS Cognito

SQLAlchemy

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 platform that investigates unexplained phenomena through community-submitted experiences and AI-powered tools.

We are seeking a Senior Full Stack Developer to join us at a pivotal moment. This is an equity-only role ideal for someone excited by early-stage building and eager to help launch something unique.

You’ll Be Responsible For:

1. Leading frontend and backend development of the Nanu platform
2. Building scalable features using Flutter and FastAPI
3. Collaborating closely with our founder and lead developers
4. Contributing to architecture, infrastructure, and product evolution
5. 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 personalized content

You’re a Great Fit If You:

• Have 10+ years of experience (minimum 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