The Embedded Competency Center is an organizational unit of Sii, that brings together almost 500 specialists. We are currently looking for a Golang Developer. You will design, develop, and maintain the core backend infrastructure that powers the entire platform, working closely with cross-functional teams to deliver robust, scalable solutions.Your tasks Design, enhance, and support connectivity solutions that integrate various communication protocols such as MQTT, OPC, REST, Kafka, and more Develop and operate systems for reliable data acquisition, transformation, analysis, and processing across heterogeneous sources Build and maintain core platform services, including OPC UA Server features, data calculation pipelines, and historical/trending data modules Implement extensible components enabling user-defined scripts, SQL execution, workflow automation, and customizable rule chains Develop notification and messaging capabilities, including email, SMS, Slack, Google Chat, and other communication channels, ensuring consistent and timely delivery Contribute to security features such as TOTP and other authentication and protection mechanisms to safeguard the platform and user data Participate in architectural discussions, feature scoping, and technical design, taking ownership of complex functionalities from concept to implementation Collaborate closely with frontend, QA, and product teams while providing support, troubleshooting, and continuous improvements for deployed services Requirements At least 4 years of backend development experience, including work on large-scale, multi-service backend systems Proficient in Go as the primary language, with additional skills in C/C++, Python, SQL, and Linux/Windows Skilled in containerised development using Docker Solid understanding of distributed architectures and practical work with microservices Practical experience with event-driven systems, messaging tools, and asynchronous communication Understanding of industrial communication standards such as OPC UA, MQTT, and similar protocols Expertise in database schema design, optimisation, and efficient data handling Solid skills in building and maintaining APIs using REST and gRPC English at an advanced level Residing in Poland required We are looking for an experienced Senior ServiceNow Developer to enhance and expand our HR module capabilities across key areas such as Case Management, Onboarding, and Document Management. In this role, you will work in a multilingual environment, supporting projects that leverage modern ServiceNow features, including Now Assist. If you thrive in complex, international environments and speak both German and English fluently, this role could be a great fit.Your tasks Design, develop, and optimize HR module functionalities in ServiceNow, focusing on Case Management, Onboarding, Document Management, and Now Assist Collaborate with German- and English-speaking stakeholders to gather requirements and deliver scalable solutions Ensure code quality, proper documentation, and adherence to ServiceNow best practices across all HR-related features Implement integrations and workflows to support end-to-end HR processes Requirements At least 5 years of experience as a ServiceNow Developer, with strong hands-on expertise in the HR module (including Case Management, Onboarding, Document Management) Working knowledge of Now Assist or similar AI-driven ServiceNow capabilities Fluency in German and English, both spoken and written Solid understanding of software development standards, best practices, and workflow design within ServiceNow Residing in Poland required What we offer  Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas  Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market  We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022  Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more  Comfortable workplace – class A offices or remote work  Dozens of fascinating projects for prestigious brands from all over the world  PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers  Investment in your growth – meetups, webinars, training platform and technology blog – you choose  Fantastic atmosphere created by all Sii Power People  Join the Sii team – develop your skills, gain experience, and build your career!