Senior C# Software Engineer

AllSTEM Connections; Westford (MA); On-site; USD 120,000 - 180,000; Full time

Job summary

AllSTEM Connections in Massachusetts is seeking a Senior C# Software Engineer to design, build, and maintain high-performance Windows applications, owning MSI packaging and deployment.

You will work with cross-functional teams to influence architecture and mentor junior engineers, while contributing to CI/CD pipelines using GitHub Actions and PowerShell.

Requires 5-6+ years in C#, .NET, WiX Toolset, and Advanced Installer; on-site in Westford, MA.

Qualifications

• Bachelor's degree in CS, software engineering, or equivalent.
• 5-6+ years of professional experience in C#, .NET, Windows Services.
• Hands-on with Advanced Installer and WiX Toolset; Windows Installer internals.
• Experience building CI/CD pipelines with GitHub Actions and PowerShell.
• Strong analytical and teamwork skills.

Responsibilities

• Design, develop, test, and maintain desktop and backend apps using C# and .NET.
• Create, maintain MSI packaging, upgrade, patches, silent install via WiX/Advanced Installer.
• Architect upgrade, patching, rollback strategies for enterprise releases.
• Contribute to CI/CD pipelines and automation using GitHub Actions/PowerShell.
• Mentor junior engineers and participate in code reviews.

Skills

C#

.NET Core/.NET Framework

Windows Services

WiX Toolset

Advanced Installer

GitHub Actions

PowerShell

CI/CD

Mentoring

Software design

Education

Bachelor's degree in Computer Science, Software Engineering, or equivalent

Tools

Job description

Position Overview

We are seeking a highly skilled Senior C# Software Engineer to design, build, and maintain scalable, high-performance Windows applications while driving robust installation, upgrade, and release engineering practices.

In this role, you will work closely with cross-functional development, QA, and product teams to deliver high-quality software releases using modern .NET technologies. You will own the MSI packaging and deployment lifecycles, influence architectural decisions, and mentor junior engineers.

Key Responsibilities

• Application Development: Design, develop, test, and maintain robust desktop and backend applications using C# and .NET Framework/.NET Core / Windows Services.
• Installer & Packaging Engineering: Create, maintain, and troubleshoot MSI packages, bootstrapper applications, upgrade packages, patches, hotfixes, and silent installation routines using WiX Toolset and Advanced Installer.
• Release & Deployment Strategy: Architect reliable upgrade, patching, rollback, and migration strategies for enterprise software releases.
• CI/CD & Automation: Contribute to automated CI/CD pipelines, release management workflows, and infrastructure scripting using GitHub Actions and PowerShell.
• Technical Leadership: Participate in code reviews, troubleshoot complex installation-related production issues, and provide mentorship to junior developers.

Qualifications & Requirements

• Education: Bachelor's degree in Computer Science, Software Engineering, or equivalent practical experience.
• Development Experience: 5-6+ years of professional software development experience specializing in C#, .NET Framework, .NET Core, and Windows Services.
• Installer Expertise: Hands-on proficiency with Advanced Installer and WiX Toolset, with a deep understanding of Windows Installer internals and troubleshooting deployment issues.
• Release Engineering: Proven experience building and managing CI/CD pipelines, GitHub Actions, and writing PowerShell automation scripts.
• Soft Skills: Strong analytical, communication, and collaboration skills with the ability to lead technical initiatives and guide team members.

Preferred Qualifications

• Experience with cloud platforms (Azure or AWS) and containerization tools (Docker, Kubernetes).
• Knowledge of microservices architecture or event-driven distributed systems.
• Familiarity with modern frontend frameworks (e.g., Angular, React, Blazor).
• Previous experience leading small technical teams or driving architectural roadmaps.

Equal Opportunity Employer / Disabled / Protected Veterans

The Know Your Rights poster is available here:

_EEOC_KnowYourRights6.12.pdf

The pay transparency policy is available here:

_%20English_formattedESQA508c.pdf

For temporary assignments lasting 13 weeks or longer, AllSTEM Connections is pleased to offer major medical, dental, vision, 401k and any statutory sick pay where required.

We are committed to working with and providing reasonable accommodations to individuals with disabilities. If you need a reasonable accommodation for any part of the employment process, please contact your staffing representative who will reach out to our HR team.

AllSTEM Connections participates in the E-Verify program in certain locations as required by law. Learn more about the E-Verify program.

_Participation_Poster_ES.pdf

We also consider for employment qualified applicants regardless of criminal histories, consistent with legal requirements, including, if applicable, the City of Los Angeles' Fair Chance Initiative for Hiring Ordinance. Pursuant to applicable state and municipal Fair Chance Laws and Ordinances, we will consider for employment-qualified applicants with arrest and conviction records, including, if applicable, the San Francisco Fair Chance Ordinance. For Los Angeles, CA applicants: Qualified applications with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance ordinance for employers and the California Fair Chance Act.

Additional Skills

(none specified)