Senior Software Engineer

FacilityOS

. Design, develop, review, and maintain backend web applications and services across the FacilityOS platform .

Posted 11/2/2026full-timeAnnapolis • Maryland • United StatesSeniorWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive experience in backend .NET Framework and .NET Core web application development using C#, with a strong focus on designing and building RESTful services and cloud-native applications on Azure. Proficient in maintaining code quality through unit testing and applying clean architecture principles while collaborating effectively with cross-functional teams.

Highest-signal resume keywords

Backend .NET Framework DevelopmentC# ProgrammingRESTful Services DesignAzure Cloud DevelopmentUnit Testing

ATS Keywords

Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

Backend .NET Core DevelopmentObject-Oriented ProgrammingDesign PatternsClean Architecture PrinciplesMicrosoft SQL ServerT-SQLEvent-Driven ArchitectureMicroservices

Soft Skills

CollaborationSelf-ManagementTechnical Decision-Making

Tools & Technologies

AzureAWSStatic Code AnalysisEngineering Tools

Industry Keywords

SaaSPaaSLegacy ModernizationRoot-Cause Analysis

Tech Stack

Tools & technologies

AWSAzureCloudMicroservicesMS SQL ServerSQL.NET

About the role

Key responsibilities & impact

Design, develop, review, and maintain backend web applications and services across the FacilityOS platform
Develop an understanding of existing platform architecture, legacy components, integration points, and modernization opportunities
Collaborate with engineering teams on technical decisions aligned with architectural principles and delivery goals
Contribute to legacy modernization using incremental, low-risk approaches such as the Strangler Fig pattern
Maintain code quality through code reviews, unit testing, static code analysis, and engineering tools and standards
Participate in peer code reviews and promote maintainable, testable, and scalable solutions
Troubleshoot and resolve application issues across staging and production environments through root-cause analysis and sustainable fixes
Work with engineering leads, product stakeholders, and project managers to support business operations and project delivery
Research, evaluate, and recommend application, automation, and architectural improvements

Requirements

What you’ll need

Minimum of 6 years of proven experience in backend .NET Framework / .NET Core web application development using C#
Ability to quickly understand complex legacy systems, identify key integration points, and contribute effectively with limited ramp-up time
Strong experience with object-oriented programming, design patterns, and clean architecture principles
Proven experience writing unit tests and applying quality-focused development practices
Proven experience designing and building RESTful services
Experience designing and building cloud-native SaaS and PaaS applications using Azure or AWS; Azure preferred
Solid knowledge of Microsoft SQL Server and T-SQL
Ability to make sound technical decisions in collaboration with engineering teams
Ability to self-manage priorities and deliver outcomes with minimal supervision
Ability to collaborate across engineering, architecture, and product stakeholders
Hands-on experience with Event-Driven architecture is a plus
Hands-on experience with Microservices is a plus
Must be legally eligible to work in the location in which you applied
Background and reference checks may include criminal record, credit, employment, and educational verification

Benefits

Comp & perks

Comprehensive health coverage
Hybrid work environment
Opportunity for advancement and growth
Catered events, snacks, and drinks
Birthday and life celebrations
Two annual parties per year