Jobs in the United States

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Added 7 mins ago
AS
IT - Systems Engineer
Apex Systems LLC
Denver, CO
- $70 to $75 USD / hour
Senior Identity & Access Management (IAM) Engineer
Added 21 mins ago
Sr. Principal System Engineer - NATO IFC Lead
Northrop Grumman
San Diego
Northrop Grumman Aeronautics Systems has an opening for a Senior Principal Systems Engineer to join our team of qualified, diverse individuals within our Systems Engineering organization,…
Added 21 mins ago
Sentinel - Staff Systems Engineer - Mechanical Systems Design Integrator
Northrop Grumman
Roy · Manhattan Beach
…Program. Northrop Grumman supports the Air Force’s sustainment, development, production and deployment of hardware and system modifications for Intercontinental Ballistic Missile (ICBM)…
Added 22 mins ago
TT
Senior Security Engineer
True Talent Solutions Partners
San Francisco, CA
- $190,000 to $250,000 USD / year
- Build and mature application security tooling, processes, and secure software development practices that fit naturally into engineering workflows.
Added 42 mins ago
Senior Mechanical Engineer
SEALED AIR CORPORATION
Kent, OH
Job Description Senior Mechanical Engineer Streetsboro Certified Rebuilt Eq Requisition ID: 57226 If you are a current employee click here to apply. Sealed Air designs and delivers…
Added 42 mins ago
Senior Manufacturing Engineer
Ohiomeansjobs Lake County
Mentor, OH
OhioMeansJobs | Lake County is accepting resumes for the following position: Position: Senior Manufacturing Engineer Location: Mentor, OH Hours: Full Time Pay: Based On Experience Position…
Added 42 mins ago
Radar Modeling and Simulation Analyst, Senior
BOOZ ALLEN HAMILTON INC
Dayton, OH
Job Number: R0239961 Radar Modeling and Simulation Analyst, Senior The Opportunity: Your engineering skills and determination are needed to develop the cutting-edge technology used to…
Added 43 mins ago
AI Software Engineer
Credence Management Solutions LLC
Dayton, OH
…Position Summary Credence has an immediate need for an AI Software Engineer to join our growing AI and Automation practice. You will be a technical anchor in our AI and Automation practice.…
Added 43 mins ago
BF
Senior Full Sack & GenAI Developer
BC Forward
Cincinnati, OH
- $65 USD / hour
Job Title: Senior Full Stack & GenAI Developer (1150) Location: Remote Duration: Contract - 3 months Pay Range: $65/hr (W2) Job ID: 410874 About BCforward BCforward is a leading global IT…
Added 43 mins ago
** Manufacturing Engineer
Dwyer Instruments, Inc.
Sunbury, OH
Supports senior engineers in research, design and development of manufacturing processes including welding schedules, production flow, assembly methods, production equipment and machining.
Added 52 mins ago
TT
Senior/Staff Product Engineer, Applied AI
True Talent Solutions Partners
San Francisco, CA
- $200,000 to $300,000 USD / year
- Define how AI agents can automate workflows across a staffing marketplace and guide the team's use of AI-assisted development tools.
Added 52 mins ago
TT
Senior Software Engineer
True Talent Solutions Partners
San Francisco, CA
- $200,000 to $240,000 USD / year
- Write technical blueprints and create reusable building blocks that improve development workflows.
Added 52 mins ago
Senior Software Engineer, Digital Platforms and Embedded Systems
BAE Systems
Nashua, NH
Job Description BAE Systems is seeking a Senior Software Engineer to join the Digital Architecture Team (DAT) in Nashua, NH. DAT provides shared digital platforms and forward-deployed…
Added 1 hour ago
Sr Software Engineer- Mobile Development
Boyd Gaming
Las Vegas, NV
Responsible for contributing development efforts to one or more of several systems that are under the core responsibility of the Development Team. This position is focused on the design,…
Added 1 hour ago
Senior Full Stack Engineer
FacilityOS
Annapolis, MD
We are looking for a highly capable Sr. Full Stack Engineer who can ramp up quickly, collaborate effectively with the existing team, and begin contributing meaningful delivery outcomes…
Added 1 hour ago
Senior Software Engineer
FacilityOS
Annapolis, MD
We are looking for a highly capable Sr. Back-End Engineer who can ramp up quickly, collaborate effectively with the existing team, and begin contributing meaningful delivery outcomes within…
Added 1 hour ago
Senior Software Engineer, Rust
Anduril Industries
Waltham, MA · Broomfield, CO
Prototype and deploy state-of-the-art algorithms for tracking, multi-sensor data fusion, and state estimation in agile, iterative development environments.
Added 1 hour ago
Senior Software Engineer, Rust
Anduril Industries
Broomfield, CO
Prototype and deploy state-of-the-art algorithms for tracking, multi-sensor data fusion, and state estimation in agile, iterative development environments.
Added 1 hour ago
Senior Software Engineer, Robotics Tracking and Fusion
Anduril Industries
Washington, DC · Waltham, MA
Prototype and deploy state-of-the-art algorithms for tracking, multi-sensor data fusion, and state estimation in agile, iterative development environments.
Added 1 hour ago
Senior Software Engineer, Robotics Tracking and Fusion
Anduril Industries
Waltham, MA
Prototype and deploy state-of-the-art algorithms for tracking, multi-sensor data fusion, and state estimation in agile, iterative development environments.
Added 1 hour ago
Senior Software Engineer- Machine Learning
Anduril Industries
Waltham, MA
We are looking to hire a Senior Software Engineer to join our growing Battlespace Awareness team. In this role, you'll provide software engineering and development support for several of…
Added 1 hour ago
Senior Software Engineer- Infrastructure
Anduril Industries
Waltham, MA · Broomfield, CO
We are looking to hire an Infrastructure / DevOps Engineer to join our growing Battlespace Awareness team. This role owns the CI/CD and integration test infrastructure that keeps our…
Added 1 hour ago
Senior Software Engineer, Battlespace Awareness
Anduril Industries
Broomfield, CO
Prototype state-of-the-art software solutions in an agile development environment
Added 1 hour ago
Senior Software Engineer, Battlespace Awareness
Anduril Industries
Waltham, MA · Broomfield, CO
Prototype state-of-the-art software solutions in an agile development environment
Added 1 hour ago
Senior GNC Software Engineer
Anduril Industries
Waltham, MA · Broomfield, CO
Integrate path planning technologies into the broader command and control software stack and development lifecycle, from requirements definition through testing and optimization.

FacilityOS

Senior Software Engineer

Annapolis, MD, United States

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Job details

Experience: Minimum of 6 years of proven experience in backend .NET Framework / .NET Core web application development using C#.
Posting language: English
Posted: Nov 1, 2026

Original job description

ABOUT FACILITYOS

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.

As we continue to scale globally, we’re building a team of driven, curious people who want to make an impact. You’ll be part of a dynamic, collaborative culture where individuals are trusted to take ownership, solve meaningful problems, and grow in their careers. 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.

About the Role:

We are looking for a highly capable Sr. 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. 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.

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.

This role is a hybrid position where you’ll be required to come into our office three (3) times a week.

Duties and Responsibilities:

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.
Contribute to legacy modernization efforts using incremental, low-risk approaches such as the Strangler Fig pattern where appropriate.
Maintain high code-quality standards through code reviews, unit testing, static code analysis, and the adoption or improvement of engineering tools and standards.
Participate actively in peer code reviews, providing constructive feedback and helping promote maintainable, testable, and scalable solutions.
Troubleshoot and resolve application issues across environments, including staging and production, with a focus on root-cause analysis and sustainable fixes.
Work directly with engineering leads, product stakeholders, and project managers to support business operations and project delivery.
Research, evaluate, and recommend innovative application, automation, and architectural improvements that would benefit the FacilityOS platform.

Skills and Qualifications:

Minimum of 6 years of proven experience in backend .NET Framework / .NET Core web application development using C#.
Proven ability to quickly understand complex legacy systems, identify key integration points, and contribute effectively with limited ramp-up time.
Strong experience using object-oriented programming, design patterns, and clean architecture principles to build maintainable, testable software.
Proven experience writing unit tests and applying quality-focused development practices.
Proven experience designing and building RESTful services.
Experience in designing and building cloud-native SaaS and PaaS applications (Azure / AWS). Azure cloud experience will be preferred
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.
Ability to self-manage priorities and deliver outcomes with minimal supervision.
Strong team-player attitude with the 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

Why work at FacilityOS?

We work hard and play hard and we do both with passion and respect for one another. Our company promotes a fast-paced, fun, friendly, and highly collaborative work environment that provides:

🩺Comprehensive health coverage

🏠A Hybrid work environment

💡Opportunity for advancement and growth

🍕 Catered Events, Snacks, Drinks – You won’t go Hungry!

🥳 Birthday and Life Celebrations

🎉 Two annual parties in a year

FacilityOS Commitment

We believe that a diverse team is the key to innovation and growth. We are an equal opportunity employer that value diversity at our company and encourage all candidates to apply. We do not discriminate based on race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

FacilityOS will accommodate individuals with disabilities through each stage of the recruitment and selection process. Please advise us of any needs when your interview is booked, and we will do our best to meet your needs.

Please note that all candidates must be legally eligible to work in the location in which you applied.

Background and Reference Checks

Any offer of employment may be conditional upon full background checks including a criminal record check, a credit check and employment and educational verifications. A reference check will also be conducted.

We may use artificial intelligence (AI) tools to support parts of the hiring process such as reviewing applications. These tools assist the recruitment team but do not replace human judgment. All advancement and hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us or click here https://www.deeplytalented.com/responsible-ai.

FacilityOS thanks all candidates for their interest, however only those selected to continue in the process will be contacted.

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