Mission freelance .NET Engineer

Your responsibilities:
* Translate scope into actionable plans, estimates, and milestones; actively manage risks, dependencies, and non-functional requirements.
* Mentor engineers (pairing, design reviews, coaching), improve team productivity, and cultivate a healthy engineering culture.
* Work closely with Product, QA, and Platform teams to unblock delivery; maintain crisp communication to stakeholders on progress and trade-offs.
* Embed secure coding practices (OWASP Top 10/ASVS), threat modelling, secrets management (e.g., Azure Key Vault), least privilege, and zero-trust principles.
* Implement strong authentication/authorization (OAuth2/OIDC), TLS everywhere, and secure API contracts.
* Partner with InfoSec and Data Governance to evidence controls, handle vulnerabilities, and pass security reviews.
* Align to internal Tech Standards for Information Security, Data Governance, and Regulatory Compliance
* Define, document, and uphold standards for coding, reviews, branching, and versioning (e.g., Trunk based development or GitFlow, mandatory PR reviews, automated quality gates).
* Drive CI/CD excellence (GitHub Actions), including build quality, unit/integration tests, static analysis, and automated deployments.
* Establish and enforce performance, reliability, and maintainability baselines; lead refactoring and modernization where needed.
* Implement comprehensive observability (metrics, distributed tracing-OpenTelemetry) and SLOs for critical services.



Your Profile
Essential skills/knowledge/experience:
.NET Expertise: .NET 8, C#, ASP.NET Core, RESTful APIs, background jobs, async programming, dependency injection, unit/integration testing frameworks.
* Security Concepts: OWASP Top 10/ASVS, threat modelling, OAuth2/OIDC, TLS, input validation, secrets management, RBAC/ABAC.
* Cloud & DevOps: Azure (App Service/AKS/Functions), IaC (Terraform/Bicep), CI/CD pipelines, containers (Docker), observability (logs/metrics/traces).
* Architecture: DDD, modular monolith/microservices, event-driven patterns, idempotency, resiliency (circuit breakers/retries), API versioning.
* Collaboration: Proven record of mentoring, elevating engineering standards, and delivering scoped outcomes in cross-functional teams.
* Apply unit testing and component testing using tools like Xunit
* Participate in Agile/SCRUM ceremonies including sprint planning, reviews, and retrospectives.



Desirable skills/knowledge/experience:
* Retail domain knowledge preferably UK retailers
* Practical knowledge of performance/load testing (k6/JMeter) and chaos/resiliency testing.
* Microservice Architecture and Design principles knowledge
* MongoDB setup and Entity framework experience



LA International is an award-winning partner of choice for many of the world's most influential companies and government organisations. Holding Enhanced Government Security Accreditation, we are recognised as the European market leader in the delivery of Security Cleared talent to organisations that demand the very highest levels of security, compliance and assurance.

A multiple award-winning organisation, having secured the prestigious Queens Award for Enterprise: International Trade over consecutive years. We are committed to fostering an inclusive, equitable and accessible workplace where everyone feels valued and supported. We welcome applications from all individuals, regardless of background or identity, and we encourage candidates who may not meet every listed requirement to still apply. If you require any adjustments or support during the recruitment process, please let us know and we will work with you to ensure a fair and accessible experience.

Please Note: If a high volume of applications is received, only candidates shortlisted will be contacted.