Mid-Level Developer - Rosebank

Our Client in the Network Industry is seeking to employ a Mid - Level Developer (Back end primarily/light Full-Stack) to their team based in Rosebank, Johannesburg.

Requirements:

• 3–6+ years engineering experience.

• Strong Python skills.

• Strong Linux administration experience.

• Docker & containerisation experience.

• MQTT device-messaging experience.

• Git/Git Hub & CI/CD workflows.

• Strong debugging and problem-solving ability.

• Understanding of ESP
  32/ESP
  8266 firmware or embedded systems.

• Networking basics (LAN/WAN, routing, NAT, static IPs).

• IoT fleet-management or large-scale distributed systems experience.

• Knowledge of solar/energy systems or interest in renewable energy.

• Lightweight full-stack experience for internal tools.

Responsibilities, but not limited to:

Backend Engineering (Core)

• Maintain and extend Python-based orchestration services for energy/load control.
• Develop new containerised microservices (Python) for energy management, scheduling, metering data, and resident-interaction logic.
• Build APIs and backend integrations for internal tools, CRM systems, dashboards, and bots.
• Optimise load-balancing algorithms, device scheduling, and resource allocation logic.

Linux and Infrastructure

• Administer and maintain multiple Linux VPS machines (Ubuntu).
• Manage code deployments (Git Hub Actions, Docker, CI/CD).
• Improve system reliability, uptime, and performance across backend services.
• Handle logging, diagnostics, failover strategies, and container orchestration.

IoT Device Ecosystem

• Support and troubleshoot field devices (ESP
  32/ESP
  8266, custom controllers).
• Improve device firmware interactions, MQTT topic structures, and telemetry flows.
• Manage OTA update processes and large-scale device fleet orchestration.
• Debug live field device behaviour across thousands of connected devices.

Full-Stack / Integrations

• Maintain internal admin tools and web interfaces (basic JS, Flask/FastAPI, lightweight React).
• Support integrations with external systems (CRM, inverter/energy APIs, metering data, cloud services).

Business and Cross-Functional Exposure

• Collaborate with operations, installation teams, and leadership.
• Participate in product and architecture decisions affecting large-scale rollouts.
• Help design processes for reliability, automation, monitoring, and scaling to 10k+ devices.

Core Technical Skills

• Python — async frameworks, microservices, orchestration, scheduling logic.

• Linux administration — managing VPS systems, logs, network configs, service management.

• Docker & containerisation — multi-service environments, networking, images, deployments.

• MQTT — broker management, device messaging, topic design.

• REST APIs — building and consuming backend services.

• Git, Git Hub, CI/CD workflows