Senior Full Stack Developer (Django + React Native / Expo)

Senior Full Stack Developer (Django + React Native / Expo)

Posted 2 weeks ago by Bonsai Smart Wealth

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Negotiable
Undetermined
Remote
London Area, United Kingdom
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Application Programming Interface (API) Authentications Continuous Integration and Continuous Delivery Datamodel Data Modeling Data Protection Strategy Django (Web Framework) Financial Data Financial Technology (FinTech) Firebase Full Stack Development Github Input/Output Management Mobile Devices Notification Systems PostgreSQL React.js React Native RESTful API Secure Coding Software Coding Software Development Software Engineering Systems Design Workflows

Summary: The Senior Full Stack Developer role focuses on leading the development of core features using Django and React Native within a fintech environment. The position requires a self-managed individual with extensive experience who can thrive in a fast-paced, low-oversight setting. The developer will be responsible for building secure and scalable systems while collaborating with various teams to deliver high-quality features. This role emphasizes autonomy and the ability to deliver results without detailed guidance.

Key Responsibilities:

  • Leading full-cycle development of core features using Django on the backend and React Native with Expo on the frontend.
  • Building secure, scalable, and modular systems for financial products.
  • Collaborating closely with product, design, and engineering leadership to ship meaningful features quickly.
  • Making architectural decisions that balance performance, maintainability, and security.
  • Writing clean, testable, well-documented code and reviewing PRs with a high bar for quality.
  • Operating effectively in a high-expectation, low-oversight environment.
  • Owning your time and output.

Key Skills:

  • 7+ years of experience as a software engineer, ideally across multiple domains.
  • Strong experience with Django (including DRF, Celery, and PostgreSQL).
  • Solid experience with React Native, specifically with Expo-managed workflows.
  • Proficient with RESTful APIs, authentication flows, and state management on mobile.
  • Comfort with CI/CD pipelines, testing, and deployment best practices.
  • Strong understanding of data models, performance optimization, and system design.
  • Ability to operate with urgency and autonomy.

Salary (Rate): undetermined

City: London Area

Country: United Kingdom

Working Arrangements: remote

IR35 Status: undetermined

Seniority Level: undetermined

Industry: IT

Detailed Description From Employer:

Job Title: Senior Full Stack Developer (Django + React Native / Expo) Location : Remote (UK timezone 4 hours +/- overlap required) Type : Full-Time Experience : 7+ years Industry : Fintech / SaaS

Who We’re Looking For

We’re hiring a highly self-managed Full Stack Developer with deep experience in Django and React Native (Expo) . You’ll be joining a small, fast-moving team building complex, high-performance systems in the fintech space. This is not a role for someone who needs hand-holding or detailed specs - it’s for someone who thrives under pressure, works independently, and consistently delivers exceptional results.

What You’ll Be Doing

  • Leading full-cycle development of core features using Django on the backend and React Native with Expo on the frontend.
  • Building secure, scalable, and modular systems for financial products.
  • Collaborating closely with product, design, and engineering leadership to ship meaningful features quickly.
  • Making architectural decisions that balance performance, maintainability, and security.
  • Writing clean, testable, well-documented code and reviewing PRs with a high bar for quality.
  • Operating effectively in a high-expectation, low-oversight environment.
  • You’ll own your time and output.

Must-Have Skills

  • 7+ years of experience as a software engineer, ideally across multiple domains.
  • Strong experience with Django (including DRF, Celery, and PostgreSQL).
  • Solid experience with React Native , specifically with Expo-managed workflows .
  • Proficient with RESTful APIs, authentication flows, and state management on mobile.
  • Comfort with CI/CD pipelines, testing, and deployment best practices.
  • Strong understanding of data models, performance optimization, and system design.
  • Ability to operate with urgency and autonomy.
  • You deliver without waiting to be told what to do.

Bonus Points

  • Prior experience in fintech or regulated environments .
  • Exposure to financial data APIs (GoCardless, Plaid, TrueLayer, Stripe, etc).
  • Experience with Firebase, background jobs, or push notification systems.
  • Knowledge of secure coding practices and data protection standards (GDPR, PCI).

Why Join Us

  • Work on something that actually matters - real problems, real users, real financial impact.
  • No micromanagement. We trust you to get the job done.
  • Fast-paced, high-standard culture with zero tolerance for mediocrity.
  • Equity upside potential in a rapidly scaling startup.

Application Process

If this sounds like your kind of role, don’t send a fluffy cover letter. Send us: Your GitHub or portfolio (we like code more than resumes) A short note on the most ambitious product or system you’ve shipped Careers@bonsaiwealth.io

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