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# Senior Full Stack Developer

- **Company:** Gtmaritime (valstone Portfolio)
- **Location:** Warrington, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** .NET Framework, Amazon Web Services, Amazon S3, C++ (Programming Language), Code Review, Databases, Software Debugging, Distributed Systems, Amazon DynamoDB, Entity Framework, Key Management, MariaDB, MySQL, Commercial Software, Query Optimization, Microsoft SharePoint, SignalR, Amazon Simple Notification Service (SNS), SQLite, TypeScript, Git, Windows Services, Cloudwatch, Amazon Simple Queue Service (SQS), Visual Basic Language, Web Api
- **Published:** September 18, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/senior-full-stack-developer/47396592

## About the Role

styleAround 8+ years of commercial software development, several at senior level owning features end to endWindows client/agent software: installers, services, code signing, upgrade and rollbackReal-time messaging (SignalR or equivalent), including tenant isolationMicrosoft Graph, SharePoint or OneDrive integration experienceWorking TypeScript and modern front-end knowledge, enough to finish a feature through the dashboardComfort reading legacy code (C++, Visual Basic)AI-assisted development experience (Claude Code, Amazon Q or similar) as everyday practiceMaritime, satellite comms, or other bandwidth-constrained domain backgroundWe'd rather fix the cause than elevate the symptom. This is the engineer who independently takes a customer-affecting problem, finds the actual root cause in a distributed system with intermittent faults, and gets the fix safely into production on equipment that's difficult to reach. Maritime experience isn't required - we'll teach you the
domain. #J-18808-Ljbffr

## Description

problems and through review feedback that teaches. Document the build and deployment process so no part of the release depends on one person.Expert-level commercial C# and .NET: advanced patterns, async and concurrency done correctly, performance and memory workASP.NET Core Web APIs, Entity Framework Core, and long-running Windows services or worker processesReal database depth - schema design, migrations, query optimization, index behavior and transaction isolation (MariaDB/MySQL, SQLite)AWS in production, not just in theory: Lambda, SQS, SNS, DynamoDB, S3, Secrets Manager, CloudWatch - able to debug a live issue from the logsDistributed systems instincts: retries, idempotency, eventual consistency, reconciling two systems that can't always reach each otherApplication security you can act on: authorization and access control, encryption and key management, credential storageAdvanced Git and CI/CD pipelines; code review that catches architectural problems, not just


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