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Sundsvall•Heltid•Jun 16
Temporary position (vikariat) 24-36 months
About KUBAL
Kubikenborg Aluminium AB (KUBAL) is Sweden’s only primary aluminum smelter, located in Sundsvall. With approximately 460 employees and over 60 years of operational history, KUBAL is a cornerstone of the Swedish metals industry. Our production runs 24/7, 365 days a year — and the software we build directly supports and controls these mission-critical processes.
Our IT team manages everything from infrastructure and OT advisory to custom software development for production systems. You will work on systems that have real, physical impact — from electrolysis cell control to casthouse operations and internal logistics.
As a Seveso III upper-tier site, KUBAL is subject to strict safety regulations. We are also actively working to align our cybersecurity practices with NIS2 principles, making reliability, security, and operational resilience core to everything we do.
About the Role
We are looking for a skilled C#/.NET Software Engineer to join our IT team on a temporary basis (vikariat, 24–36 months) while a team member is assigned to a dedicated production system modernization project. This role develops and maintains digital solutions supporting core production processes and auxiliary functions at the smelter.
Key Responsibilities
Develop and maintain process control software (MES, HMI integrations, dashboards) for casting and electrolysis operations using C#/.NET and Blazor.
Build and improve internal web applications on Kubernetes, including REST APIs, background services, and data pipelines.
Integrate with SCADA systems, PLCs, and industrial data sources via OPC UA, MQTT/Sparkplug B, and SQL interfaces.
Collaborate with production engineers, electricians, and operators to translate process needs into working software.
Contribute to software architecture, API/interface design, and technical documentation.
Ensure reliability of mission-critical systems, including on-call rotation and emergency response.
Leverage AI-assisted development tools and agentic coding workflows to accelerate delivery and code quality.
Improve system performance, scalability, and security across the application portfolio.
Tech Environment
Languages & Frameworks: C#, .NET 8+, ASP.NET Core, Blazor, Entity Framework Core
Databases: MySQL (HA cluster), SQL Server, PostgreSQL
Infrastructure: Docker, Kubernetes, Linux, VMware, Microsoft on-premises stack
DevOps & Tools: GitLab CE (CI/CD), Grafana, Keycloak, REST APIs, JSON, XML
Industrial / OT: SCADA, OPC UA, MQTT/Sparkplug B, PLC integration, MES
AI-Assisted Dev: Claude Code, GitHub Copilot, agentic coding workflows, MCP integrations
Requirements
Bachelor's or Master's degree in Computer Science, Systems Engineering, or equivalent professional experience.
At least 2–4 years designing and developing scalable, maintainable, and secure software (or equivalent project portfolio).
Strong C#/.NET skills (.NET 6+ / .NET 8 preferred).
Experience with relational databases (MySQL, SQL Server, or PostgreSQL), including query writing and basic optimization.
Solid understanding of the SDLC and version control (Git).
Working knowledge of agile practices (Scrum, Kanban), including sprint planning, stand-ups, and retrospectives.
Good communication skills in English (written and spoken).
Swedish strongly preferred for daily collaboration with production teams, operators, and on-site stakeholders.
Merits (Preferred Skills & Experience)
Web & Frontend: Modern web UI frameworks (Blazor, React, Angular, or Vue) and frontend tech (HTML, CSS, JavaScript/TypeScript); familiarity with mobile development.
Infrastructure & DevOps: Docker and Kubernetes; CI/CD pipelines (GitLab CI, GitHub Actions, or similar); HA MySQL clustering or database replication; basic Linux (Ubuntu) administration.
Quality & Testing: TDD and unit testing frameworks (xUnit, NUnit, MSTest); integration testing and code quality tools.
Identity & Integration: Identity management (Active Directory, Keycloak, OAuth 2.0/OIDC, or similar on-premises IAM); document automation (Microsoft Office APIs, OpenXML, or reporting frameworks); Grafana or similar monitoring tools.
Industrial & Domain: Industrial protocols and systems (OPC UA, MQTT, SCADA, HMI, PLC); interest or experience in heavy industry, process manufacturing, or production environments; C++ for embedded or performance-critical systems.
AI-Assisted Development: AI-assisted and agentic tools (GitHub Copilot, Claude Code, OpenAI Codex, Cursor, OpenCode, or similar); prompt engineering for code generation, refactoring, and review; Model Context Protocol (MCP) integrations for developer tooling.
What We Offer
Competitive salary, set individually based on experience and qualifications.
Occupational pension (ITP) and insurance benefits.
A small, high-impact team where your work directly supports real production operations.
Broad technical exposure: from web applications and cloud-native infrastructure to industrial OT systems.
Professional development opportunities and conference attendance.
Sundsvall offers excellent quality of life: affordable housing, short commutes, world-class outdoor recreation, and proximity to both coast and mountains.
Employment Terms
Type: Temporary (vikariat), 24–36 months, substituting for a team member on a dedicated production system modernization project
Start date: As per agreement
Probation: 6 months
Location: Sundsvall (on-site)
Salary: Competitive, set individually based on experience and qualifications
Reporting: The C#/.NET Software Engineer reports directly to the Head of IT.
Contact Information
For questions about the position, contact: Yevgen Izvyekov, IT chef – 073-988 80 42
Trade union representatives: Unionen: Patrik Bergström, 073-986 0739 Ledarna: Marcus Lansink, 073-988 58 88
Application Process
Please send your application marked "Mjukvaruutvecklare / C#/.NET Software Engineer" to jobb@kubal.se as soon as possible, but no later than June 19, 2026. Applications are processed on an ongoing basis, so the position may be filled before the deadline.