Job Description

Senior Legacy Migration Engineer (C#, .Net)

Swedium Global is a growing System Engineering and Solution Company offering services such as Semiconductor Engineering R&D Services, Embedded Systems Development, Custom Application Software Development, Web and Cloud Application Development, Testing Services, Consultancy, and Outsourcing services to clients across the globe through both onsite and offshore business models. Swedium Global has a presence in Sweden, Finland, Poland, the Czech Republic, and India.

Senior Legacy Migration Engineer (C#/.NET)
Location: Stockholm Metropolitan Area, Sweden
Seniority: Senior
Language: English (Full Professional)
Duration: 6 Months(Posiblities of extention)

Position Summary
We are hiring a Senior Software Engineer to execute migration and stabilization work across business-critical insurance and pension integrations in our platform.

Role Type & Scope

• Individual contributor with end-to-end technical ownership for assigned migration flows.
• Expected to work independently in complex legacy environments.
• Collaborates with Infrastructure, DBA, MQ, and Operations teams.
• No people management responsibility.

Core Mission

• Deliver safe and fast migration outcomes for legacy and hybrid services, with minimal business disruption and clear rollback readiness.

Mandatory Technical Skills

• C# and .NET Framework 4.x (3.5 exposure is a plus)
• WCF, SOAP, and ASMX service maintenance and migration
• IIS deployment and troubleshooting (application pools, bindings, configuration)
• Windows Services and Task Scheduler-based batch operations
• SQL Server troubleshooting and secure configuration handling
• IBM MQ integration fundamentals (connectivity, queue, and channel diagnostics)
• PowerShell automation for deployment, verification, and operations
• TFS & Git workflows and CI/CD pipeline collaboration
• General knowledge of PKI (Public Key Infrastructure)

Preferred Technical Skills
Candidate should have at least 2 of the following:

• C or C++ maintenance in Windows service environments
• Mainframe-adjacent integration patterns (EBCDIC and file bridge patterns)
• Container and Kubernetes exposure for coexistence with modern APIs
• Production observability and incident response in regulated environments
• Legacy security hardening (service accounts, encrypted settings portability)

Key Responsibilities

• Execute migration tasks across legacy and modern components.
• Validate environment parity and eliminate runtime blockers before cutover.
• Diagnose and fix production-critical issues in services, queues, and integrations.
• Build and execute end-to-end migration verification and rollback tests.
• Produce concise runbooks and deployment notes for repeatable execution.
• Ensure all acceptance criteria are met before Go/No-Go decisions.

Candidate Evidence We Want

• Proven migration delivery in legacy enterprise systems with low incident impact.
• Direct IIS plus WCF/ASMX production cutover experience.
• Practical MQ troubleshooting and backlog handling under pressure.
• Clear examples of rollback strategy and execution in real releases.
• Demonstrated ability to balance migration speed with operational safety.