OSI Digital

Delivers data-driven digital transformation solutions

Senior Technical Lead, C# / .NET

Backend EngineeringConfirmed live in the last 24 hours

Full-timeTwin Cities, MN, USANo salary listed

About the Job

Requirements

10–15 years of strong information technology experience, with deep expertise in C# and .NET Framework 4.x.
Hands-on experience migrating to .NET 6, 8, or 10, including multi-targeting, netstandard2.0, and resolving package conflicts.
Strong Windows Communication Foundation skills, including reading bindings, configurations, and contracts, and debugging services.
Experience with SQL Server and ADO.NET, including reading stored procedures and working with DataSets.
Experience with MSBuild, NuGet, PowerShell build scripting, and Azure DevOps pipelines.
A proven track record of shipping safely to production.
Clear written communication with onshore and offshore teams and client stakeholders.
Willingness to visit the customer onsite in Richfield, Minnesota as needed.

Responsibilities

Own the technical direction of the point-of-sale codebase and be accountable for its health, stability, and evolution.
Lead incremental modernization from .NET Framework toward modern .NET without a big-bang rewrite.
Protect production by reviewing changes for risk, anticipating how things can break, and ensuring safe releases.
Coordinate technical decisions across onshore and offshore developers so work stays consistent and aligned.
Mentor senior engineers and set engineering standards for code, documentation, and process.
Work directly with the customer, including onsite visits, to understand needs, challenge unrealistic designs or timelines, and propose improvements.
Improve the code, documentation, and processes.

Desired Qualifications

Experience with Windows Workflow Foundation 4 (XAML).
Retail point-of-sale or payments experience, including EMV, tender, store-and-forward, and PCI DSS awareness.
Enough Angular experience to read and understand client-side code.
Experience with CoreWCF, ASP.NET Core, and OpenID Connect authentication.
Experience with Checkmarx remediation, TeamCity, and similar tooling.

Role: Senior Technical Lead, C# / .NET
Location: Greater Minneapolis/St. Paul, Minnesota Hybrid
Type: Full Time

About the role
We’re looking for a Senior Technical Lead to become the technical owner of The Customer’s point-of-sale codebase, a mature, business-critical system running in stores every day.
This is not a rewrite role. The right person improves the code steadily and deliberately while protecting the store floor from regressions. You’ll modernize incrementally, raise the quality bar across the team, and bring forward practical ideas for new capabilities.
As a Senior Technical Lead, you’ll go beyond guiding a single team. You’ll own the hardest technical problems in the platform, coordinate technical decisions across onshore and offshore developers, mentor senior engineers, and work directly with The Customer’s stakeholders to turn business goals into realistic technical plans. You’ll still write code, but much of your impact will come from design reviews, technical planning, and making the right calls about risk.

The system
The platform is built in three layers:

POS application. Built in C# on .NET Framework 4.8 and .NET 10, using ASP.NET Core APIs, Windows Workflow Foundation, and SQL Server.
Shared layers. Common, Hosting, the POS business layer, and a workflow engine, spanning netstandard2.0, net48, and net10 components.
User interfaces. Built in Angular 21.2 and TypeScript 5.9.

What you’ll do

Own the technical direction of the POS codebase and be accountable for its health, stability, and evolution
Lead incremental modernization from .NET Framework toward modern .NET without a big-bang rewrite
Protect production by reviewing changes for risk, anticipating how things can break, and ensuring safe releases
Coordinate technical decisions across onshore and offshore developers so work stays consistent and aligned
Mentor senior engineers and set engineering standards for code, documentation, and process
Work directly with The Customer, including onsite visits, to understand needs, push back on unrealistic designs or timelines, and propose improvements
Leave the code, documentation, and processes in better shape than you found them

Must have

10-15 years of strong IT experience, deep expertise in C# and .NET Framework 4.x
Hands-on experience migrating to .NET 6/8/10, including multi-targeting, netstandard2.0, and resolving package conflicts
Strong WCF skills: reading bindings, configurations, and contracts, and debugging services
SQL Server and ADO.NET, including comfort reading stored procedures and working with DataSets
MSBuild, NuGet, and PowerShell build scripting, with Azure DevOps pipelines
A proven track record of shipping safely to production
Clear written communication with onshore and offshore teams and directly with client stakeholders
Willingness to be onsite with The Customer in Richfield, MN as needed

Nice to have

Windows Workflow Foundation 4 (XAML)
Retail POS or payments experience: EMV, tender, store-and-forward, and PCI DSS awareness
Enough Angular to read and understand client-side code
CoreWCF, ASP.NET Core, and OpenID Connect authentication
Checkmarx remediation, TeamCity, and similar tooling

Who you are

A clear, proactive communicator who’s looking for a long-term role where youi can grow with the platform and the team
You’ve modernized a .NET Framework system incrementally, not through a big-bang rewrite
You ask the right questions and think carefully about how changes can break things
You care about leaving systems better than you found them, from code to documentation to process
You’re comfortable owning outcomes and being the person others rely on for technical judgment

About the Company

OSI Digital

Delivers data-driven digital transformation solutions

OSI Digital provides business and technology solutions that help organizations improve performance by turning data into actionable insights. It designs, develops, and implements new systems and services, and also manages and enhances existing platforms, covering data capture, security, integration, analysis, and optimization across the data lifecycle. The company differentiates itself with a global footprint and a large offshore delivery center in Hyderabad, plus partnerships with top tech providers like Tableau, Salesforce, Oracle, Microsoft, AWS, Dell Boomi, and Red Hat to deliver integrated solutions across multiple industries. Its goal is to accelerate digital transformation for clients—from startups to Fortune 500 companies—by delivering data-driven capabilities that improve outcomes.

Company size: 201-500
Company stage: Not listed
Total funding: Not listed
Headquarters: Los Angeles, CA
Founded: 1993

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