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

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

**IMPORTANT** for your application to be considered, please email answers to the below questions to careers@bonsaiwealth.io and armin@bonsaiwealth.io

1) Describe a production system you’ve built using Django and React Native (Expo)

2) In Django, how have you handled long-running tasks or async workflows?

2) How do you approach state management in React Native when dealing with complex data interactions and API syncing?

3) What would your CI/CD pipeline look like for a full stack Django + Expo app?

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 start-up.

Application Process

If this sounds like your kind of role and you're excited to , 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
• This will be a contract position for 6 months, targeting 30-40 hours per week (flexible). The rate will be £1,500-£2,000 per calendar month, depending on hours and experience.

Careers@bonsaiwealth.io