Principal Golang Engineer

We are looking for a Principal GoLang Engineer to work directly on our proprietary, in-house product in a fast-paced and dynamic environment Must-have requirements: 9 years commercial experience as Software Engineer in full time position (if you have less then 9 years of experience please review https://justjoin.it/job-offer/lumen-technologies-golang-engineerremote-lublin-go ) 1 year experience in Tech Lead position (If you do not have such experience please review https://justjoin.it/job-offer/lumen-technologies-senior-golang-engineerremote-poland-remotego ) Computer Science (or similar) University Degree Accept working hours: 12:00 - 20:00 (in Central European Time) This is hands-on position, expectation is you will be spending at least 70% of time on coding. Hi If you enjoy building resilient automation solutions and designing seamless API integrations for real-world business challenges, this role is for you Join us to work with modern technologies like Golang, Temporal.io , and OpenTelemetry while creating scalable systems that power telecommunications service delivery. What we do We're building an internal platform for a telecommunications service provider that streamlines network service management and service delivery processes. Our solution exposes APIs and leverages Temporal workflows to handle asynchronous tasks, with comprehensive observability through OpenTelemetry, Grafana, Prometheus, and Tempo. Your responsibilities • Develop automation solutions for telecommunications service management. • Design and optimize APIs for seamless system integration. • Leverage orchestration tools like Temporal.io to build scalable, resilient workflows. • Implement and maintain observability using OpenTelemetry with Grafana, Prometheus, and Tempo. • Troubleshoot and debug distributed systems across service boundaries. • Ensure comprehensive documentation for automation, API design, and system integrations. Our requirements • Strong expertise in Golang, including concurrency patterns, error handling, and API development. • Experience designing and implementing RESTful APIs and asynchronous messaging systems. • Proficiency with observability tools and metrics collection (OpenTelemetry, Prometheus, or similar). • Strong debugging and problem-solving skills for distributed systems. • Familiarity with performance profiling and optimization techniques in Go. • Experience with containerization using Docker and container-based development workflows. • Ability to work in cross-functional teams and communicate effectively with stakeholders. • Experience with test-driven development and writing maintainable, well-tested code. Nice to have • Experience with workflow orchestration systems like Temporal or Cadence. • Knowledge of telecommunications domain. • Ability to mentor engineers and drive best practices in software architecture. • Understanding of OpenAPI/Swagger standards. • Experience with infrastructure as code and CI/CD pipelines. • Experience with cloud services (AWS, GCP, or Azure). • Understanding of networking protocols and service mesh technologies. • Experience with Kubernetes.