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

JR United Kingdom; Bolton; Remote; GBP 60,000 - 80,000; Part time

Job summary

A leading company is seeking a Senior Full Stack Developer for an equity-only, remote role. The ideal candidate will have over 10 years of experience, particularly with Flutter and Python, and will lead the development of a groundbreaking platform. This position offers flexible hours and the chance to influence 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, minimum 5+ with Flutter, Python, AWS.
• Experience in building clean, scalable, production-ready apps.
• Thrives in startup environments and takes ownership.

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

Tools

PostgreSQL

FastAPI

Redis

SQLAlchemy

OpenAI API

Job description

The provided job description is quite detailed and well-structured, but it can be improved for clarity and consistency in formatting. Here is a refined version:

Senior Full Stack Developer (Equity Only | Remote | Flutter + FastAPI) - Bolton, Greater Manchester

Client: Unknown Systems

Location: Bolton, Greater Manchester, United Kingdom

Job Category: Other

EU work permit required: Yes

Job Details

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 personalized content

Ideal Candidate:

• 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