Mid-Level Developer

7 days ago

Johannesburg South Africa Headhunters Full time R50 000

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/GitHub & CI/CD workflows. Strong debugging and problem-solving ability. Understanding of ESP32/ESP8266 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 (GitHub 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 (ESP32/ESP8266, 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, GitHub, CI/CD workflows Please note that should you not receive a response within 2 weeks of applying, you may consider your application unsuccessful.

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