Senior Software Engineer - C# (4011)

GBG•Manchester, NH

3d•Hybrid

About The Position

GBG is seeking a Senior Software Engineer to join the Windows Desktop SDK team within the Documents & Biometrics product group. This team is responsible for the Sentinel product, a forensic document-authentication engine used in demanding identity verification environments. The role involves designing, implementing, and maintaining complex features and improvements for Windows-deployed SDKs and supporting desktop components. The engineer will own technical solutions end-to-end, focusing on improving architecture, code quality, performance, and diagnosability. Responsibilities include refactoring and modernizing code, debugging complex Windows issues, building automation, contributing to the delivery pipeline, maintaining compatibility across scanning devices, producing technical documentation, and experimenting with AI tools. Collaboration with engineers across the Desktop team and wider Documents & Biometrics group, as well as active participation in agile ceremonies, is expected.

Requirements

Strong professional experience developing Windows-delivered SDKs and/or desktop components using C# and .NET Framework
Proven track record of owning and delivering complex features in production codebases
Strong software design, debugging, and problem-solving skills
Proficiency with Git/GitHub and collaborative development workflows
Experience modernising older codebases to current technologies and standards
Experience improving testability, reliability, and automation in Windows-based products
Comfortable contributing across the delivery pipeline when needed, covering build, packaging, deployment, and validation

Nice To Haves

Document imaging fundamentals for scanning and OCR
Proven use of AI tools embedded systematically into day-to-day development, using them to improve quality, accelerate delivery, or reduce toil, not just as an occasional aid
C++ experience
AWS experience (used for development team infrastructure)
Experience working with device SDKs, peripherals, or scanner hardware
Familiarity with CI/CD systems for Windows builds and validation
InstallShield experience, particularly building and maintaining Windows SDK installers

Responsibilities

Design, implement, and maintain complex features and fixes in C#/.NET Windows SDKs and supporting desktop components
Own technical solutions end-to-end, from design through implementation, testing, and release
Improve architecture, code quality, performance, and diagnosability for Windows SDK deliverables
Refactor and modernise existing code to improve testability and long-term sustainability
Debug and resolve complex Windows issues using logs, runtime behaviour, and deep system analysis
Build and evolve automation including unit and integration tests
Contribute across the delivery pipeline where needed, covering build automation, packaging, deployment, and validation workflows
Maintain compatibility across the range of scanning devices and hardware platforms our software supports
Produce and maintain clear technical documentation to support knowledge sharing and onboarding
Experiment with and integrate AI tools into the team's daily workflows to accelerate delivery and quality
Collaborate closely with engineers across the Desktop team and wider Documents & Biometrics group
Contribute actively to agile ceremonies including sprint planning, stand-ups, and retrospectives