Senior Full Stack Developer (Integrations & Middleware)

The Role A high-level Senior Full Stack Developer who thrives on the "logic" side of engineering. While you’ll work across the stack, your primary mission is to build, secure, and maintain the complex web of integrations connecting our core business systems. You are the go-to expert for C#, APIs, and Middleware. While this is an individual contributor role, you will play a vital part in levelling up the team, identifying knowledge gaps in our junior developers (particularly in backend logic and security) and coaching them through code reviews and collaborative builds. Key Responsibilities Core Development & Integration • The Middleware Backplane: Design and build sophisticated automation "recipes" in Workato (Backplane) and Power Automate to sync data between Business Central, Pipedrive, and Ooona. • Backend Engineering: Develop high-performance APIs and microservices using C# / .NET to handle data transformation and application logic. • Frontend Support: Build and maintain internal tools and dashboards using React to visualize integration health and business data. • Database Management: Write and optimize MS SQL queries and stored procedures to ensure data consistency across our Linux and Windows environments. Mentorship & Team Growth • Knowledge Sharing: Act as a technical bridge for junior developers, helping them master backend concepts, API best practices, and complex SQL. • Code Quality: Lead peer code reviews with a focus on teaching, not just policing, ensuring the team understands the why behind clean, dry code. • Refactoring: Lead by example by refactoring legacy scripts into modern, tested, and documented services. Security & Quality Assurance • Security Testing: Implement and test security protocols (OAuth, JWT, Encryption) to protect data moving between AWS and our on-premise servers. • Automated Testing: Build out Unit Tests (xUnit/nUnit/Jest) to ensure integrations are resilient to API changes or data spikes. Technical Toolkit  • Languages: C# (.NET Core), JavaScript / TypeScript, T-SQL. • Middleware: Workato (Backplane), Power Automate, Office Scripts. • Frontend: React.js, CSS/HTML. • Systems: MS Business Central, Pipedrive, Ooona. • Infrastructure: AWS (S3, Lambda, EC2), Linux & Windows Server. • Data/Testing: MS SQL Server, Power BI, xUnit/nUnit, OWASP Security standards. Additional Skills • English language proficiency