.NET Back-End Developer
OneOcean, a maritime software company owned by Lloyd's Register, is hiring a mid-level .NET back-end developer to design and maintain server-side services, REST/GraphQL APIs, and microservices. Core stack: .NET 8+/C#, Entity Framework Core, SQL Server, Azure DevOps, with auth (OAuth2/OIDC) and Docker.
- Compensation
- Not disclosed
- Location
- x, United Kingdom
- Work setup
- Remote
- Seniority
- Middle
- Employment
- Not specified
- Experience
- 2+ years
- Category
- Backend
- Posted
Skills
Must have
- Multiple years of commercial back-end development experience; at least 5 years with .NET C#
- At least 2-3 years with .NET 6+ / .NET 8+, Entity Framework Core, LINQ, SQL Server, and asynchronous programming
- Proficient with Entity Framework Core (code-first); relational database experience (primarily SQL Server) including schema design and query optimisation
- Firm grasp of Clean Architecture and Domain-Driven Design (DDD), Dependency Injection, modular monolith or microservices patterns
- Hands-on experience with JWT, OAuth2, and OpenID Connect, using Azure Entra or Duende IdentityServer
- Azure DevOps for task management (Boards) and maintaining CI/CD pipelines
- Docker for containerising services
- Unit and integration testing with xUnit; FluentValidation for data integrity
- Application profiling and structured logging with Serilog integrated with Application Insights
- Design, develop, and maintain back-end services, RESTful/GraphQL APIs, and microservices
- Comfortable working in an Agile/sprint-based environment
Nice to have
- Previous work on high-traffic / consumer-facing apps or apps with complex business logic
- Experience with cloud platforms (Azure preferred – App Services, Functions, Key Vault, Service Bus, Cosmos DB)
- Knowledge of orchestration (Kubernetes)
- Experience with message brokers (RabbitMQ, Azure Service Bus, Kafka)
- Familiarity with NoSQL databases (Cosmos DB)
- Basic understanding of front-end technologies
Full description
🚢 Discover OneOcean:
OneOcean is a unified brand born from the integration of OneOcean and Ocean Technologies Group.
Owned by Lloyd’s Register, an organisation with more than 260 years of trust, integrity and leadership at sea, OneOcean combines the agility and ambition of a fast-moving innovator with the strength and stability of one of the world’s most trusted maritime institutions.
At the heart of OneOcean is a portfolio unlike any other in maritime. A comprehensive, integrated portfolio built on years of expertise, trusted by thousands of maritime professionals around the world.
🎯 Our Mission: Our mission is clear. In the race to zero emissions, our research, advisory and technical expertise and industry-firsts are supporting a safe, sustainable maritime energy transition. Today we are a leading provider of classification and compliance services to the marine and offshore industries, helping our clients design, construct and operate their assets to accepted levels of safety and environmental compliance.
🔍 Why Join OneOcean Crew?
Legacy & Innovation: We were created more than 260 years ago as the world’s first marine classification society to improve and set standards for the safety of ships.
Global Impact: Our digital solutions are relied upon by more than 30,000 vessels, following the acquisition of OneOcean in 2022 and Ocean Technologies Group in 2024.
Product Offering: Covering five proven product areas - learning, fleet operations, compliance, voyage planning and performance management - supporting its customers from ship to shore, from training and people operations, to voyage compliance and optimisation.
🧭 Navigating the position: .NET Back-End Developer
We have a proven concept and a solid foundation, now, we need a Mid-level Back-End Developer with strong .NET expertise to join our engineering team and help design, build, and maintain robust, scalable server-side applications and APIs that power our products and services.
You will work closely with product managers to translate complex requirements into clean, maintainable, and performant code, solving complex business problems, and collaborating in an agile environment.
In this role, you will be a core contributor to our application lifecycle. You will:
- Build & Iterate: Design, develop, and maintain high-quality back-end services, RESTful/GraphQL APIs, and microservices using .NET.
- Storage: Work with relational databases (primarily SQL Server) – design schemas, write efficient queries, and optimise performance.
- Data Access: Implement data access layers using Entity Framework Core.