Senior Fullstack Developer - Fully Remote
Senior Fullstack Developer - Fully Remote

Senior Fullstack Developer - Fully Remote

London Full-Time 36000 - 60000 £ / year (est.) No home office possible
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At a Glance

  • Tasks: Lead the development of a unique platform using Flutter and FastAPI.
  • Company: Join Unknown Systems, a startup focused on exploring unexplained phenomena.
  • Benefits: Enjoy equity in the company, flexible hours, and a remote-first culture.
  • Why this job: Be part of a groundbreaking project that shapes a global community-driven product.
  • Qualifications: 10+ years of experience, with 5+ in Flutter, Python, and AWS.
  • Other info: Ideal for those who thrive in startup environments and are mission-driven.

The predicted salary is between 36000 - 60000 £ per year.

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

Senior Fullstack Developer - Fully Remote employer: Unknown Systems

At Unknown Systems, we pride ourselves on being an exceptional employer, particularly for those passionate about innovative technology and community-driven projects. Our fully remote work culture offers unparalleled flexibility, allowing you to balance your professional and personal life while contributing to a groundbreaking platform. With equity opportunities and a collaborative environment, you'll have the chance to shape the future of Nanu alongside a dedicated team, making a meaningful impact in the world.
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Contact Detail:

Unknown Systems Recruiting Team

StudySmarter Expert Advice 🤫

We think this is how you could land Senior Fullstack Developer - Fully Remote

✨Tip Number 1

Familiarise yourself with the tech stack mentioned in the job description. Make sure you can confidently discuss your experience with Flutter, FastAPI, and Python during any conversations or interviews. This will show that you're not only qualified but also genuinely interested in the role.

✨Tip Number 2

Highlight your experience in startup environments. Share specific examples of how you've taken ownership of projects and contributed to their success. This will resonate well with the company's culture and demonstrate that you can thrive in a dynamic setting.

✨Tip Number 3

Prepare to discuss your approach to building scalable applications. Be ready to share insights on best practices and any challenges you've faced in previous roles, especially related to community-driven products or AI integrations.

✨Tip Number 4

Engage with the company’s mission and values. Research Unknown Systems and their platform, Nanu, to understand their goals. Being able to articulate why you're passionate about their work will set you apart as a candidate who truly aligns with their vision.

We think you need these skills to ace Senior Fullstack Developer - Fully Remote

Flutter Development
FastAPI
Python Programming
PostgreSQL Database Management
AWS Cognito Authentication
Redis
Alembic
SQLAlchemy
Pydantic
Pytest
AI Integration (OpenAI API)
Frontend and Backend Development
Scalable Application Architecture
Startup Environment Adaptability
Collaboration and Teamwork
Problem-Solving Skills

Some tips for your application 🫡

Tailor Your CV: Make sure your CV highlights your experience with Flutter, FastAPI, and Python. Emphasise any relevant projects or roles that showcase your ability to build scalable applications and work in a startup environment.

Craft a Compelling Cover Letter: In your cover letter, express your enthusiasm for the equity-only model and early-stage building. Share why you are excited about the Nanu platform and how your skills align with their mission.

Showcase Relevant Projects: Include links to your portfolio or GitHub repositories that demonstrate your work with the technologies mentioned in the job description. Highlight any projects that involved AI or community-driven platforms.

Prepare for Technical Questions: Anticipate technical questions related to your experience with the tech stack. Be ready to discuss your approach to building scalable features and your experience with AWS and database management.

How to prepare for a job interview at Unknown Systems

✨Showcase Your Technical Skills

Be prepared to discuss your experience with Flutter and FastAPI in detail. Highlight specific projects where you've built scalable applications, and be ready to demonstrate your understanding of the tech stack mentioned in the job description.

✨Emphasise Your Startup Experience

Since this role is in a startup environment, share examples of how you've thrived in similar settings. Talk about times when you've taken ownership of projects and contributed to the evolution of products.

✨Demonstrate Your Curiosity and Open-Mindedness

The company values curiosity and an open mind. Prepare to discuss how you've approached problem-solving in the past and how you stay updated with new technologies and trends, especially in AI and community-driven platforms.

✨Align with Their Mission

Research Unknown Systems and their platform, Nanu. Be ready to express why you're excited about their mission and how you can contribute to building something that truly matters to the community.

Senior Fullstack Developer - Fully Remote
Unknown Systems
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  • Senior Fullstack Developer - Fully Remote

    London
    Full-Time
    36000 - 60000 £ / year (est.)

    Application deadline: 2027-05-27

  • U

    Unknown Systems

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