Senior Fullstack Developer (JS, REMOTE)

The Role

We are looking for a Senior Fullstack .NET Developer to join our fast-growing Network. In this role, you’ll own the design and implementation of backend services and APIs using .NET (C# / ASP.NET Core), while delivering polished, performant user interfaces using modern frontend technologies and .NET-driven UI frameworks. You will collaborate with product managers, designers, and other engineers to deliver end-to-end features, make architectural decisions, and mentor more junior engineers.

This is a long-term, full-time remote engagement. You’ll have the opportunity to work with modern cloud platforms, CI/CD pipelines, and deliver impactful features in real products used by customers around the world.

What we are looking for

• 5+ years of professional software development experience, with strong fullstack exposure.
• Relational databases - MSSQL experience.
• 3+ years of production experience with .NET (C#, .NET Core / .NET 6+) and ASP.NET Core.
• Solid knowledge of JavaScript/TypeScript, HTML5 and CSS3, or experience with .NET UI frameworks such as Blazor and Razor Pages.
• Experience with relational databases (e.g., SQL Server, PostgreSQL) and ORM tooling such as Entity Framework Core.
• Strong understanding of RESTful API design and integration patterns.
• Experience with automated testing (unit, integration) and test frameworks for both backend and frontend.
• Practical experience with containerization (Docker) and familiarity with CI/CD pipelines (e.g., GitHub Actions, Azure DevOps, GitLab CI).
• Experience deploying and operating services in the cloud (Azure preferred, AWS/GCP acceptable).
• Ability to work independently and deliver high-quality results in a remote setup.
• Intermediate-advanced English
• Located in CET timezone (+/- 3 hours), we are unable to consider applications from candidates in other time zones.

Nice-to-have

Deep experience with TypeScript and modern frontend tooling (Vite, Webpack).

Proven experience with Blazor, ASP.NET MVC or other .NET-centric UI frameworks.

Familiarity with microservices patterns, DDD, CQRS or event-driven architectures.

Experience with container orchestration (Kubernetes).

Knowledge of message brokers (e.g., RabbitMQ, Kafka, Azure Service Bus).

Experience with GraphQL and schema design.

Exposure to performance tuning, caching strategies and observability (logs, tracing, metrics).

Responsibilities

Design, implement, and operate scalable backend services using .NET (C#, ASP.NET Core).

Build and maintain responsive, accessible user interfaces using modern frontend technologies and/or .NET UI frameworks (e.g., Blazor, Razor Pages).

Design and consume robust RESTful APIs (and optionally GraphQL) and integrate with databases and external systems.

Ensure code quality through testing (unit/integration), code reviews, and automated pipelines.

Drive architectural decisions for backend, frontend, and their integration (microservices, monoliths, or hybrid).

Collaborate with designers and product teams to translate requirements into technical solutions and great user experiences.

Troubleshoot production issues, optimize performance, and ensure application reliability and security.

Mentor and coach other engineers, contribute to best practices and team processes.

Participate in an agile development process and help continuously improve delivery and observability.

Document design choices, API contracts, and deployment procedures.

What we offer

Get paid, not played – No more unreliable clients. Enjoy on-time monthly payments with flexible withdrawal options.

Predictable project hours – Enjoy a harmonious work-life balance with consistent 8-hour working days with clients.

Flex days, so you can recharge – Enjoy up to 24 flex days off per year without losing pay, for full-time positions found through Proxify.

Career-accelerating positions at cutting-edge companies – Discover exclusive long-term remote positions at the world's most exciting companies.

Hand-picked opportunities just for you – Skip the typical recruitment roadblocks and biases with personally matched positions.

One seamless process, multiple opportunities – A one-time contracting process for endless opportunities, with no extra assessments.

Compensation – Enjoy the same pay, every month with positions landed through Proxify.

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