Full Stack Engineer (Python+React)

•Are you curious, excited by experimentation and always looking to innovate?
•Do you want to work in embedded payments where you can keep learning and developing whilst getting hands-on experience?
•Do you want to have the opportunity to play an important role in a rapidly growing and exciting Fintech business?
If so, we would love to connect and collaborate!

We want to hire ambitious, and value-adding talent into Modulr, one of the fastest growing payments businesses in the UK and Europe. Modulr is experiencing significant growth, and in this role you will work in a cross-functional team who are asked to solve a problem, rather than be handed a task to do. This is an excellent opportunity to work in a high-growth environment with a fast-paced and collaborative culture where you will have great opportunities to work on challenging problems.

About us
At Modulr, our vision is a world where all businesses are powered by embedded payments. Modulr enables businesses, from SMEs to Enterprise, initially across the UK and Europe to efficiently pay-in, collect and disburse funds instantly via a range of payment schemes, accounts, and card products.
We have created an industry-leading API platform with comprehensive online tools and access, to meet the demands of daily business payments. We have two routes to market. Our Core Business Payments product allows customers in any sector to connect to us and our expanding network of accounting and payroll platforms, including Sage, Xero, BrightPay and IRIS to automate payments. Our Vertical Solutions targets a growing range of industry verticals which directly connect their IT platforms to our APIs and webhooks. We solve complex payment problems for hundreds of clients in a range of industries, including Travel, Lending, Wage Advance, and Investment & Wealth.
We are deeply integrated into the payment eco-system. In the UK, we are direct participants of Faster Payments and Bacs. Modulr hold settlement accounts at the Bank of England. Our payment network connectivity includes CHAPS, Open Banking, SEPA, SWIFT and account issuance in multiple currencies. We are principal issuing members of Visa and Mastercard schemes across UK and Europe. Our regulatory permissions and governance structure are the foundations of our business. We are regulated and supervised as an Authorised Electronic Money Institution (AEMI) in the UK by the Financial Conduct Authority and in the Netherlands by De Nederlandsche Bank.
Our founding team has a wealth of experience in the payments industry and growing successful businesses. Modulr is backed by the venture arms of payments giants PayPal and FIS, as well as growth investors Blenheim Chalcot, General Atlantic, Frog Capital and Highland Europe.
Modulr now has over 400 employees spread globally across offices in London, Edinburgh, Amsterdam, and Mumbai.

Modulr values
•Building the extraordinary; going that extra mile.
•Owning the opportunity; be passionate and proud of the time you invest.
•Move at pace; reach goals faster whilst supported on your career journey.
•Achieve it together, working collaboratively and being a Modulite.

Summary
We are looking for a highly skilled Full Stack Engineer with strong experience in operational automation. The ideal candidate will design, develop, and maintain scalable web applications while implementing automation across operational workflows, deployments, monitoring, and system reliability. This role requires expertise across frontend and backend engineering, API design, database management, and observability practices.

Specific duties
•Design and develop scalable full-stack web applications.
•Implement operational automation across CI/CD, monitoring, alerting, and infrastructure workflows.
•Build secure, high-performance RESTful and GraphQL APIs.
•Ensure authentication, authorization, and secure session management.
•Optimize application performance and ensure high availability.
•Implement logging, monitoring, alerting, and health checks for production systems.
•Collaborate with DevOps, SRE, and product teams to improve operational efficiency.

About You
Frontend (Client-Side) Core Technologies
•HTML5, CSS3, JavaScript (ES6+)
•Responsive design using Flexbox and CSS Grid Frameworks / Libraries
•React.js / Angular / Vue.js
•State management: Redux, Zustand, NgRx
•Component libraries: Material UI, Ant Design, Tailwind CSS

Frontend Engineering Practices
•REST / GraphQL API integration
•Authentication (JWT, OAuth, SSO)
•Form validation and structured error handling
•Performance optimization (lazy loading, code splitting, bundle optimization)

Backend (Server-Side)
Languages & Frameworks
•Node.js (Express, NestJS)
•Python (FastAPI, Django, Flask)
•Java (Spring Boot) / .NET Core (Optional)

API Design & Engineering
•Design and implementation of RESTful APIs
•GraphQL schema and resolver development
•API versioning and backward compatibility
•Input validation and centralized error handling

Databases & Storage
Relational Databases
•PostgreSQL, MySQL, SQL Server
•Query optimization and indexing strategies

NoSQL Databases
•MongoDB, DynamoDB, Redis
•Caching strategies and performance tuning

Data Handling
•Schema design and data modeling
•Database migrations and version control
•Transaction management and data consistency

Observability & Monitoring
•Logging systems: ELK Stack, CloudWatch
•Monitoring tools: Prometheus, Grafana
•Alerting mechanisms and incident response workflows
•Application health checks and uptime monitoring
Operational Automation & DevOps Integration
•CI/CD pipeline automation (GitHub Actions, Jenkins, GitLab CI)
•Infrastructure as Code (Terraform, CloudFormation)
•Containerization and orchestration (Docker, Kubernetes)
•Automated testing frameworks and quality gates
•Deployment automation and rollback strategies

Qualifications
•Bachelor’s/Master’s degree in Computer Science or related field.
•5+ years of experience in full stack development.
•Proven experience in operational automation and production system support.
•Strong understanding of scalable system design and distributed systems.
•Excellent problem-solving and communication skills.

ModInclusion
At Modulr, we are working hard to build a more positive diverse and inclusive culture that helps everyone to feel they belong and can truly bring their whole self to work. Not only is it the right thing to do for everyone in the Modulr team, it’s also the right thing to do for our business, the community we operate in and attracting future talent. As part of our approach, we actively welcome applications from candidates with diverse backgrounds.