Technical Architect and Senior Back End Developer (C#, .Net 6+, ASP.NET Core, EF Core) (CPT Onsite) at Datafin Recruitment

ENVIRONMENT:

• OUR client in ClimateTech seeks a hands-on Technical Architect and Senior Backend Developer to take ownership of the platform’s end-to-end technical design and personally lead the build of its core Backend services.
• You will be the design authority for its Azure-native, microservices-based architecture and a Senior Engineer writing C# code in the cluster — equally comfortable in a whiteboard session with stakeholders, in a code review on a plugin assembly, and in a war-room debugging a production data ingestion job.
• The successful candidate must have 8+ years of professional Software Engineering with at least the last 4 in a Senior, Architect, or Tech-Lead capacity on production cloud systems.
• You will also require deep C# and .NET expertise: .NET Core / .NET 6+ (and ideally .NET 8/10), ASP.NET Core, EF Core, async/await fluency, performance tuning, and modern C# language features.

DUTIES:

Architecture and technical leadership –

• Own the end-to-end technical architecture of the platform across the application plane (AKS), the data and analytics plane (Databricks/Delta Lake), and the DevOps/observability plane.
• Maintain and evolve the architecture documentation, decision records (ADRs), and reference diagrams; make and defend trade-off decisions with the CTO and product leadership.
• Define the service decomposition strategy, inter-service contracts, and the rules of engagement for the custom Orchestration Layer that mediates communication between Kubernetes services.
• Set non-functional standards — performance, scalability, resilience, security, observability — and verify the system meets them.
• Lead architecture reviews, code reviews, and design sessions; mentor Mid-level and Junior Engineers and grow the team’s depth in .NET, Azure, and distributed systems.

Hands-on Backend Engineering –

• Personally design, build, and maintain core Backend microservices in C# / .NET 10 (Ingestion, API, Auth, Orchestration) running in containers on AKS.
• Build out the Generic Data Ingestion Layer — the abstraction, the standardised internal data models, and the plugin SDK that other engineers use to onboard new data sources.
• Implement and review C# plugin assemblies for specific energy-domain sources: industrial meters (mines and smelters), invoice ingestion, ERP/financial system integrations, MES, and SAWEM market gateway.
• Design schemas and access patterns for the sharded SQL Server estate, the Redis caching layer, and Blob/ADLS storage; own data-tier performance and consistency.
• Implement secure runtime configuration (Azure Key Vault via CSI), workload identity, and authentication/authorisation flows backed by Entra ID.
• Build the integration surface between the operational AKS plane and the Databricks data platform — feeding Bronze, consuming Gold, and serving low-latency ML inference endpoints from AKS.

Delivery, quality, and operations –

• Own the GitHub-based CI/CD pipelines into Azure Container Registry and AKS, including build, test, scan, and progressive deployment strategies.
• Embed observability from day one — structured Serilog logging, Application Insights tracing, Log Analytics queries, Azure Monitor dashboards and alerting — and use it to drive operational excellence.
• Define and enforce the testing strategy: unit, integration, contract, performance, and chaos/failure tests appropriate to a financially significant ETRM-adjacent system.
• Participate in production support, incident response, and post-incident reviews; close the loop back into design and standards.

Stakeholder and client engagement –

• Translate complex regulatory, market, and operational requirements (forecasting cadences, settlement rules, PPA/LTNPA obligations, demand-response participation, value-at-risk methodology) into pragmatic technical designs.
• Present the architecture confidently to client engineering, security, and audit teams — including in support of RFP responses, technical design documents, and SLA commitments.

REQUIREMENTS:

Core Engineering — Non-negotiable –

• 8+ Years of professional Software Engineering with at least the last 4 in a Senior, Architect, or Tech-Lead capacity on production cloud systems.
• Deep C# and .NET expertise: .NET Core / .NET 6+ (and ideally .NET 8/10), ASP.NET Core, EF Core, async/await fluency, performance tuning, and modern C# language features.
• .NET assembly loading and plugin architectures: real experience designing extensibility models using AssemblyLoadContext or equivalent, including isolation, versioning, and dependency management of dynamically loaded assemblies.
• Distributed systems design: service decomposition, idempotency, eventual consistency, retries and back-off, distributed transactions/sagas, and patterns for service-to-service communication and orchestration.
• Microservices on Kubernetes: production experience running C# workloads on AKS (or EKS/GKE), including Helm/Kustomize, ingress, autoscaling, network policies, and the Kubernetes API.

Azure platform –

• AKS in production: cluster design, node pools, workload identity / managed identities, secrets via Key Vault Provider for Secrets Store CSI driver.
• Azure SQL Database / Managed Instance, including sharded or horizontally partitioned designs, query tuning, and high-availability patterns.
• Azure Blob Storage and ADLS Gen 2 — lifecycle management, access tiers, security.
• Azure Cache for Redis — caching, distributed locks, pub/sub, and consistency patterns.
• Microsoft Entra ID (Azure AD) — OAuth2/OIDC, app registrations, roles and groups, B2B/B2C scenarios where relevant.
• Azure Key Vault, Application Insights, Log Analytics, and Azure Monitor — used together, not as isolated tools.

Data platform and analytics –

• Hands-on Databricks experience and the medallion (Bronze/Silver/Gold) lakehouse pattern on Delta Lake / ADLS Gen 2.
• Apache Spark for ETL/ELT — comfortable reasoning about partitioning, shuffles, and job performance even if a data engineer writes most of the notebooks.
• Working knowledge of MLflow and how production ML models are registered, versioned, deployed, and monitored — including low-latency inference served from Kubernetes.
• Practical SQL fluency for analytical and transactional workloads, and a clear point of view on where each belongs.

DevOps, security, and operations –

• GitHub Actions (or equivalent) for CI/CD into Azure Container Registry and AKS; experience with progressive delivery and rollback.
• Container security, image scanning, and secret management discipline.
• Structured logging with Serilog and a strong opinion on observability — traces, metrics, logs, and correlation across services.
• Threat modelling and secure-by-design thinking; comfort with the security review process for regulated or financially-material systems.

Frontend awareness –

• You will not own the React / Next.js Frontend day-to-day, but you must be able to design clean APIs for it, debug end-to-end issues, and hold a credible technical conversation with the frontend lead.

Highly desirable –

• Direct experience in complex systems, with legacy data sources, building future facing solutions.
• Integration experience with industrial meters, SCADA, MES, or ERP systems (SAP, Oracle, Microsoft Dynamics).
• Exposure to regulated reporting environments (financial, ESG, or compliance) and the discipline that comes with them.
• Client engagement, writing, or open-source contributions — anything that shows you can communicate as well as you build.