Junior Full Stack Developer – AI Analytics Platform (FinTech).
We’re partnered with an innovative fintech business building a cutting-edge AI-driven analytics platform for the financial services sector. They’re looking for a motivated Junior Full Stack Developer to join their growing engineering team. This is a great opportunity to work with modern technologies across both backend and frontend development, while gaining valuable exposure to quantitative finance applications and cloud infrastructure.
The Role:
You’ll be involved in developing both the Python-based calculation engine and the React frontend, as well as contributing to the AWS infrastructure that powers the platform. The position offers a broad scope — from API development and database optimisation, through to building responsive UIs and supporting real-time market data integrations.
Key Responsibilities
* Develop and maintain RESTful APIs for portfolio risk and analytics using Python and FastAPI
* Build responsive React components for visualising financial data and portfolio management
* Implement data validation and type safety with Pydantic models and TypeScript
* Write unit and integration tests to ensure high-quality backend services
* Assist with database schema design and optimisation (SQLAlchemy/SQLModel)
* Support deployment and monitoring across AWS infrastructure
* Contribute to real-time market data integrations and caching strategies
* Participate in peer code reviews and uphold quality standards (pyright, ruff, etc.)
Core Skills
* Python 3.10+ with a basic grasp of async/await patterns
* React, JavaScript/TypeScript, HTML/CSS
* REST API design principles and JSON handling
* SQL fundamentals, ideally PostgreSQL or similar
* Git workflows and collaborative version control
* Basic unit testing experience
* Familiarity with npm/yarn and pip/uv for package management
Nice to Have
* Experience with FastAPI, Flask, or Django
* Understanding of Docker and containerisation workflows
* Exposure to AWS services (EC2, RDS, Lambda, CloudWatch)
* Knowledge of Redis or caching techniques
* Experience with data visualisation libraries (Chart.js, D3.js, Recharts)
Why Apply?
* Work with modern tools and frameworks in a live fintech environment
* Gain hands-on experience with both backend and frontend development
* Exposure to AWS and real-time financial data applications
* Collaborative, supportive team culture with strong technical mentorship
Contact Ciara Clarke at Harrington Starr for a confidential discussion on this role.