As a Mid-Level Software Engineer, you'll primarily build and evolve backend services and data workflows in C#/.NET while contributing to Angular front-end features when needed. You'll design and implement REST APIs, integrate AWS services, tune MySQL performance, and maintain high standards for reliability, security, and observability. You're comfortable jumping into the UI to unblock delivery (Angular/JavaScript/CSS/HTML), collaborating closely with Product, Design, and QA.
Responsibilities
* Design, implement, and maintain .NET 8+ services and .NET Framework components.
* Build secure, well-versioned REST APIs; enforce contract and integration tests.
* Model and optimize MySQL schemas, queries, indexes, and migrations.
* Integrate with AWS services: EC2, ECS (Fargate/EC2), S3, RDS (MySQL), SQS, ElastiCache (Redis), SES, Cognito, CloudWatch.
* Containerize services and deploy via ECS with sensible health checks, autoscaling, and rollbacks.
* Add/iterate on front-end features in Angular (TypeScript), JavaScript, CSS, and HTML.
* Build and maintain CI/CD in TeamCity (triggered from GitHub PRs): test, scan, package, deploy.
* Instrument code and pipelines; monitor with New Relic + CloudWatch; respond to incidents with data-driven root cause analysis.
* Contribute to code reviews, ADRs, and lightweight design docs; keep standards crisp and pragmatic.
* Collaborate across teams; decompose work into small, incremental deliveries behind feature flags.
Must have
* 3-6 years professional experience, including substantial backend work.
* Strong C# with .NET 8+ and .NET Framework.
* Solid MySQL experience (schema design, indexing, query tuning, transactions).
* Hands-on AWS usage (RDS, ECS, EC2, ELB, S3, SQS, ElastiCache/Redis, SES, Cognito, CloudWatch).
* Proficiency with GitHub, TeamCity, containers (Docker).
* Working knowledge of JavaScript, CSS, HTML and a UI framework (Angular, React etc) to contribute meaningful UI changes.
* Sound understanding of security (OAuth/OIDC with Cognito, secrets, least privilege) and performance (profiling, async I/O).
Nice to have
* Windows Services.
* Desktop (WPF, WinForms, Chromium).
* Observability best practices (structured logging, tracing, SLIs/SLOs).
Skills (Behavioural & Leadership)
* Bias to automate and simplify; pragmatic about trade-offs.
* Clear communicator; comfortable writing short design notes/ADRs.
* Collaborative, feedback-friendly, and happy to jump between backend and frontend to unblock the team.
Working at Sage means you're supporting millions of small and medium sized businesses globally with technology to work faster and smarter. We leverage the future of AI, meaning business owners spend less time doing routine tasks, like entering invoices and generating reports, and more time pursuing their ambitions.
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