Senior .NET Engineer — Lead, Microservices & Cloud

Zensar Technologies; Johannesburg; On-site; ZAR 900,000 - 1,600,000; Full time

Job summary

Zensar Technologies in Johannesburg is seeking a senior .NET Developer to design and deliver high‑throughput software in a distributed microservices environment. You will work with .NET 8+ and C# 12+, drive API design, and optimize performance across databases, caching, and messaging layers.

You’ll lead architectural discussions, mentor peers, and uphold SOLID principles, testing, and observability practices in a fast‑moving, collaborative team. This role is on-site in Johannesburg.

Qualifications

• Expert-level proficiency in .NET 8+ and C# 12+ (async/await, LINQ, performance tuning).
• Strong experience with Dapper and EF Core, including ORM trade-offs and performance tuning.
• Advanced SQL Server skills: query tuning, indexing, execution plans, statistics.
• Understanding of ACID, isolation levels, deadlocks, sharding, and partitioning (beneficial).
• Redis expertise in distributed caching and invalidation strategies (beneficial).
• Elasticsearch experience (indexing, search and aggregation performance).
• API design (REST / gRPC), backward compatibility, and versioning strategies.
• Strong ability to lead design discussions and influence architecture without formal authority.

Responsibilities

• Lead design discussions and influence architecture without formal authority.
• Build and maintain scalable systems within a distributed microservices architecture.
• Design and implement RESTful APIs with strong versioning and documentation standards.
• Develop event driven services using message queue technologies to support high volume, asynchronous workloads.
• Design and optimize databases, queries, and indexing for ultra high throughput environments.
• Implement advanced caching patterns (Redis, distributed caching) to reduce latency and boost performance.
• Drive code quality through rigorous reviews, adherence to SOLID principles, and best practice engineering standards.
• Mentor junior and mid-level developers and support their growth.
• Lead adoption of testing practices (unit, integration, contract, load testing).
• Identify opportunities for system refactoring, modernization, and performance improvement.

Skills

.NET 8+

C# 12+

Dapper

EF Core

SQL Server

API design REST/gRPC

Distributed microservices

Caching patterns (Redis)

OpenTelemetry

Testing automation

SOLID & design patterns

Code reviews

Mentoring

Education

Bachelor's degree in Computer Science or related field

Tools

Azure DevOps

OpenTelemetry

Redis

Elasticsearch

Kafka / message queues

Logging/Monitoring tooling

Job description

Zensar Technologies in Johannesburg is seeking a senior .NET Developer to design and deliver high‑throughput software in a distributed microservices environment. You will work with .NET 8+ and C# 12+, drive API design, and optimize performance across databases, caching, and messaging layers.

You’ll lead architectural discussions, mentor peers, and uphold SOLID principles, testing, and observability practices in a fast‑moving, collaborative team. This role is on-site in Johannesburg.