Senior Fullstack Developer
COGNATIV · UK ·
- Seniority
- Senior
- Category
- Fullstack
Description
About the role:
We are building a greenfield, document-driven lending platform that automates the full lifecycle of a loan application — from document intake and OCR-based extraction, through human-in-the-loop review, to final approval and downstream submission. The system is a modular monolith with a clear separation between backend services and multiple trust-boundaried web front ends, deployed natively on Azure.
We're looking for a senior full-stack engineer who is equally comfortable designing clean, testable back-end architecture in C#/.NET and building modern, production-grade UI in React/Next.js. You'll work across the stack: domain modeling, API design, background/async processing, and customer- and operations-facing web applications.
Requirements
About the role:
We are building a greenfield, document-driven lending platform that automates the full lifecycle of a loan application — from document intake and OCR-based extraction, through human-in-the-loop review, to final approval and downstream submission. The system is a modular monolith with a clear separation between backend services and multiple trust-boundaried web front ends, deployed natively on Azure.
We're looking for a senior full-stack engineer who is equally comfortable designing clean, testable back-end architecture in C#/.NET and building modern, production-grade UI in React/Next.js. You'll work across the stack: domain modeling, API design, background/async processing, and customer- and operations-facing web applications.
Requirements
- 8+ years of professional software development experience, with deep expertise in C# / .NET (ASP.NET Core).
- 4+ years building production front-end applications with React, including Next.js (App Router, server components/actions, route handlers).
- Strong understanding of Clean/Layered Architecture, domain modeling, and separation of concerns in non-trivial back-end systems.
- Experience with relational databases and ORMs (EF Core or equivalent), including migrations and query performance.
- Solid TypeScript skills and comfort working in a monorepo with shared, versioned internal packages.
- Experience with cloud infrastructure (Azure preferred; AWS/GCP equivalents considered) — messaging/queues, object storage, secrets management.
- Experience implementing or integrating OAuth2/OIDC-based authentication, ideally with enterprise identity providers (e.g., Microsoft Entra ID or similar).
- Strong automated testing discipline: unit, integration, and contract testing on both back end and front end.
- Comfortable working across the full stack without hand-offs — from database schema to API to UI.
- Excellent communication skills and experience working in a small, senior, high-autonomy engineering team.