Jobs in the United States

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Added 21 mins ago
PI
Sr. Associate - Solutions Engineer
Pfizer Inc
NY · PA
- $79,400 to $132,400 USD / year
The Senior Associate, Solutions Software Engineer is a hands-on individual contributor who designs, builds, integrates, and supports digital solutions using approved enterprise platforms,…
Added 23 mins ago
Product Strategy Sr Manager
ServiceNow
San Diego, CA
It all started when engineer Fred Luddy wrote code that automated a tedious task for his coworker, Phyllis. She cried tears of joy. That moment inspired Fred to build a company that could…
Added 24 mins ago
Sr Automation Engineer – Warehouse Automation Software, Integration & Digital Twin
Jabil Inc.
St. Petersburg/Tampa, FL
As Senior Automation Engineer – Warehouse Automation Software, Integration & Digital Twin, you will be responsible for designing, analyzing, modifying, and integrating advanced robotics,…
Added 28 mins ago
Manufacturing Design Engineer II – Tooling & GSE II/III/Sr - Lunar
Blue Origin Personnel, LLC
Space Coast, FL
As part of Blue Origin’s Lunar Operations team, you will work with specialists, technicians, and engineers to develop and implement manufacturing and production processes that support the…
Added 28 mins ago
Software Developer Sr
ECS FEDERAL LLC
QUANTICO, VA
…organizations? ECS is seeking a highly skilled and motivated Software Engineer to provide IT services and support for hardware, IT systems, applications, and operational technologies that…
Added 46 mins ago
Senior Geotechnical Engineer
TPC Civil - East
New Rochelle, NY
We are seeking an experienced Senior Geotechnical Engineer to provide technical leadership for geotechnical engineering activities supporting heavy civil infrastructure projects. The…
Added 48 mins ago
Sr Systems Engineer II
CSX
Jacksonville, FL
…Works closely with application, infrastructure, security, and operations teams to deliver scalable, secure, reliable, and repeatable solutions using Kubernetes, Ansible, and API Gateway…
Added 50 mins ago
Sr. Systems Engineer (Modeling and Analysis)
Jobgether
Remote, United States
We are seeking an experienced Senior Systems Engineer to contribute to the design, development, and analysis of advanced satellite and aerospace systems. In this role, you will support the…
Added 54 mins ago
Digital Software Engineer Sr Lead Analyst SVP
Citi
IRVING, TX · Irving, TX · Irving
Citi is looking for a Digital Software Engineer to lead digital architecture strategy across one of the world's most consequential financial technology environments. In this role, you will…
Added 1 hour ago
Test Automation Engineer
Clearbrook Group Services Inc.
United States
Develop estimates for time and cost related to test automation development and ongoing operations.
Added 1 hour ago
Sr. Detection Engineer
NewGen Technologies
Arlington, VA
The Senior Detection Engineer develops, validates, deploys, and tunes detection logic supporting proactive threat hunting across federal and critical infrastructure environments. The role…
Added 1 hour ago
J
Sr. Full Stack AI Engineer
Woburn, MA
- $130,000 to $155,000 USD / year
…Times New Roman and more. Monotype specializes in the design, development, licensing, and management of typefaces and font technologies for the world’s biggest global brands and individual…
Added 1 hour ago
Senior Design Engineer, Electrical
Blue Bird Brand
Fort Valley, GA · Troy, MI
Reporting to the Director of Electrical Engineering, the Sr. Design Engineer, Electrical will lead the design, development, and optimization of complex electrical systems and vehicle…
Added 1 hour ago
Sr. Process Engineer- KOE
Kiewit
Houston, TX
Utilizes industry and company standards to design and engineer effectively.
Added 1 hour ago
Sr. Staff Planning Engineer
Expand Energy
Oklahoma City, OK
Leads asset development planning and optimizes capital allocation
Added 1 hour ago
Sr. Network Engineer
Novacore Insurance Services, LLC
United States
Ongoing mentorship and professional development
Added 2 hours ago
Model Validation 2nd LOD Sr. Lead Analyst
Citibank, N.A.
United States
…pricing/risk models. Scrutinize mathematical formulations in Model Development Documents and provide evidence-based challenges to model assumptions, conceptual soundness, model performance,…
Added 2 hours ago
Sr. Presales Systems Engineer
Forescout Technologies Inc.
United States
Forescout has an excellent opportunity for a strategic and business-focused Sr. Presales Systems Engineer to join our high-energy, multi-cultural, world-changing team. As the Sr. Presales…
Added 2 hours ago
Sr. Structural Engineer, Data Center Engineering
Amazon
Seattle, WA
As the Senior Structural Engineer you will be responsible for the structural infrastructure strategy and continuous product innovation and development to support our rapidly expanding…
Added 3 hours ago
Software Developer, Senior
ECS FEDERAL LLC
QUANTICO, VA
…organizations? ECS is seeking a highly skilled and motivated Software Engineer to provide IT services and support for hardware, IT systems, applications, and operational technologies that…
Added 6 hours ago
Sr. Engineer - Cloud (Remote)
CrowdStrike, Inc.
Remote, United States
Take part in on-call rotations to ensure high quality operations 24/7
Added 6 hours ago
Sr. Platform Engineer - Kubernetes (Remote)
CrowdStrike, Inc.
Remote, United States
CrowdStrike is hiring for a Sr. Platform Engineer to help with continued global expansion of the Falcon platform. We are looking for a highly technical, hands-on Engineer with experience…
Added 7 hours ago
Sr. Principal System Engineer - NATO IFC Lead
CORP-Corporate Office
United States
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 11 hours ago
Sr Contamination Control Engineer
ASML US, LP. (US20)
Wilton, CT
…smaller, faster, and more powerful chips. As a Senior Production Engineer, you will play a critical role in strengthening manufacturing performance, supporting new product introductions,…
Added 12 hours ago
Launch Operations Engineer (All levels)
Blue Origin Personnel, LLC
Space Coast, FL
This role supports the development and operations of New Glenn, a single-configuration, heavy-lift orbital launch vehicle capable of routinely carrying people and payloads to low-Earth…

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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