Senior Fullstack Developer

This is a fully remote position, open to applicants in United Kingdom.

📋 Description

• Design and develop business logic and domain modules in an ASP.NET Core API adhering to Clean Architecture principles, which encompass Domain, Application, Infrastructure, and API layers.

• Create and manage asynchronous background processing services (a .NET worker) tailored for document-intensive workflows, coordinated through message queues.

• Develop and sustain various Next.js/React applications catering to diverse user groups (internal operations/back-office tools and external/customer-facing portals), utilizing a shared package layer.

• Craft relational data models and write optimized data access code using EF Core and PostgreSQL.

• Integrate with cloud-native infrastructure components such as message queues, blob storage, secrets management, and managed identity providers.

• Implement authentication and authorization mechanisms across multiple identity domains (distinguishing between workforce and external/customer identities).

• Collaborate on API contracts and shared TypeScript types that are utilized by front-end applications.

• Engage in architectural discussions aimed at maintaining a growing monolith that is modular, maintainable, and thoroughly tested (including unit, integration, contract, and architecture tests).

• Operate within a human-in-the-loop product model, developing tools that enable operators to review, amend, and approve AI-assisted extraction results, ensuring full traceability from raw intake to final approval.

• Write and uphold automated tests throughout the stack while contributing to the health of the CI/CD pipeline.

• Participate in code reviews, technical design discussions, and provide mentorship to less experienced engineers.

⛳️ Requirements

• A minimum of 8 years of professional software development experience, with substantial expertise in C# / .NET (ASP.NET Core).

• At least 4 years of experience in building production front-end applications with React, including Next.js (App Router, server components/actions, and route handlers).

• A solid understanding of Clean/Layered Architecture, domain modeling, and the separation of concerns in complex back-end systems.

• Experience with relational databases and ORMs (EF Core or equivalent), including handling migrations and optimizing query performance.

• Proficient in TypeScript and comfortable working within a monorepo environment that utilizes shared, versioned internal packages.

• Familiarity with cloud infrastructure (Azure preferred; AWS/GCP equivalents are acceptable) — encompassing messaging/queues, object storage, and secrets management.

• Experience in implementing or integrating OAuth2/OIDC-based authentication, preferably with enterprise identity providers (e.g., Microsoft Entra ID or similar).

• Strong discipline in automated testing, including unit, integration, and contract testing for both back end and front end.

• Ability to work across the full stack without hand-offs — from database schema to API to UI development.

• Exceptional communication skills and a background in working within a small, senior, high-autonomy engineering team.

🏝️ Benefits

• Competitive salary and performance-based bonuses.

• Comprehensive health, dental, and vision insurance.

• Flexible work hours and remote work options.

• Opportunities for professional development and continuous learning.

• Collaborative and innovative work environment.