FacilityOS

Senior Software Engineer

Maryland · Senior

Sponsorship not specifiedDetected 9 days ago

.NETObject-Oriented ProgrammingCode ReviewSQLRESTResearchCollaboration

About the role

This role is well suited for someone who is comfortable navigating legacy systems, applying strong architectural principles, and making thoughtful technical decisions that improve delivery throughput without compromising quality.
Contribute to legacy modernization efforts using incremental, low-risk approaches such as the Strangler Fig pattern where appropriate.

As we continue to scale globally, we're building a team of driven, curious people who want to make an impact.
Our team comes together in-office twice a week to connect, collaborate, and build momentum.
If you're looking to do your best work alongside a great team in a high-growth environment, FacilityOS is the place to build your career.
Back-End Engineer who can ramp up quickly, collaborate effectively with the existing team, and begin contributing meaningful delivery outcomes within the first few weeks.
Design, develop, review, and maintain backend web applications and services across the FacilityOS platform.
Quickly develop a working understanding of existing platform architecture, legacy components, integration points, and modernization opportunities.
Collaborate with the engineering team to make sound technical decisions that align with established architectural principles and delivery goals.
Work directly with engineering leads, product stakeholders, and project managers to support business operations and project delivery.
Strong experience using object-oriented programming, design patterns, and clean architecture principles to build maintainable, testable software.

The ideal candidate brings strong backend engineering experience, sound judgment, and the ability to work independently while staying closely aligned with team standards and architectural direction.
Proven ability to quickly understand complex legacy systems, identify key integration points, and contribute effectively with limited ramp-up time.

Minimum of 8 years of proven experience in backend.NET Framework /.NET Core web application development using C#.
Proven experience applying the Strangler Fig pattern or similar modernization approaches to gradually replace or refactor legacy systems.
Proven experience writing unit tests and applying quality-focused development practices.
Proven experience designing and building RESTful services.
Solid knowledge of Microsoft SQL Server and T-SQL.
Ability to make sound technical decisions in collaboration with existing engineering teams.
Proactive, curious, and investigative mindset with strong attention to quality and detail.
Passion for technology, continuous improvement, and modern engineering practices.

FacilityOS is a fast-growing company redefining how facilities operate-bringing safety, security, and daily operations into one unified platform used by organizations around the world.
Research, evaluate, and recommend innovative application, automation, and architectural improvements that would benefit the FacilityOS platform.

We are looking for a highly capable Sr.
You'll be part of a dynamic, collaborative culture where individuals are trusted to take ownership, solve meaningful problems, and grow in their careers.

This listing is sourced directly from FacilityOS's careers page and normalized into a canonical job model.