Contract Senior Full Stack Developer
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Role: Senior Developer / Founding Engineer
Contract Opportunity
Outside IR35
UK or Europe
Tech: React, React Native, Node, TypeScript, AWS
Start date: Immediate
Wedo is working with a pre-seed early stage start up who is building a mobile banking platform.
The product already has a v1 application live with test users, which provides a solid starting point. However, there was limited handover, so part of this role will involve understanding the existing system and rationalising parts of the architecture as the product evolves.
The immediate focus for the role is integrating a Banking-as-a-Service provider (likely ClearBank) and building the financial infrastructure required to support the product’s core mission.
This includes:
Designing and building the ClearBank API integration
Supporting virtual accounts, payment blocking and transaction monitoring
Handling webhooks and financial transaction data
Extending the GraphQL schema and DynamoDB model
Building new React Native mobile flows for spending controls, transaction history and account setup
Ensuring the platform handles PII and financial data securely and aligns with FCA / PSD2 expectations
Current Architecture
The current system spans several technologies including:
React Native (Expo) mobile application
TypeScript across both mobile and API layers
Node.js / GraphQL (Apollo Server) backend
Go-based AI chatbot service
AWS infrastructure (Lambda, DynamoDB, API Gateway, Cognito, SSM)
Terraform / Serverless Framework for infrastructure management
Part of the role will involve evaluating the current architecture and improving it where needed (for example moving parts of the API away from a purely serverless model to a more persistent database-backed approach).
The strongest candidates will likely be engineers who:
Have experience building products from scratch in early-stage startups
Are comfortable working in small teams with high ownership
Can clearly articulate what they personally built and why technical decisions were made
Are pragmatic builders who can move quickly without creating long-term technical debt
Fintech or open banking experience is helpful but not essential, provided the engineer is comfortable integrating third-party APIs and understands the importance of security and defensive programming when handling financial data.
Security Mindset
Given the nature of the product, security awareness is critical — particularly around financial transactions, PII, token handling and protecting vulnerable users.
To apply, connect with Jack Cole and send your CV to jack.cole@wedotech.uk. Equally, hit easy apply today.