Jobs in the United States

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Added 1 min ago
Software Engineer III
Pearson
Honolulu, HI
This Software Engineer position is responsible for analysis, design, implementation, unit testing, and quality engineering to produce and maintain high-quality software solutions.
Added 1 min ago
O
Senior Data Systems Software Engineer - Exadata Database
Oracle
Honolulu, HI
- $85,400 to $209,500 USD / year
Added 5 mins ago
Systems Test Engineer II
Hewlett Packard Enterprise
Spring, TX
…Artificial Intelligence (AI) development and applications. The engineer plays a key role in validating complex integrated systems before release, helping identify product issues that could…
Added 9 mins ago
Software Engineer III
Pearson
Jackson, MS
This Software Engineer position is responsible for analysis, design, implementation, unit testing, and quality engineering to produce and maintain high-quality software solutions.
Added 9 mins ago
O
Senior Data Systems Software Engineer - Exadata Database
Oracle
Jackson, MS
- $85,400 to $209,500 USD / year
Added 14 mins ago
Senior VDI Engineer
Valiant Solutions, LLC
St. Louis, MO
Valiant Solutions is seeking a Senior VDI Engineer to join our rapidly growing, innovative team!
Added 14 mins ago
VTOC Operations Engineer
Valiant Solutions, LLC
St. Louis, MO
Valiant Solutions is seeking a VTOC Operations Engineer to join our rapidly growing, innovative team!
Added 14 mins ago
Hybrid Cloud Platform Engineer
Valiant Solutions, LLC
St. Louis, MO · Springfield, VA, VA
Valiant Solutions is seeking a Hybrid Cloud Platform Engineer to join our rapidly growing, innovative team!
Added 14 mins ago
HPC Infrastructure & Cluster Engineer
Valiant Solutions, LLC
Springfield, VA, VA
Valiant Solutions is seeking an HPC Infrastructure & Cluster Engineer to join our rapidly growing and innovative team!
Added 14 mins ago
Citrix Software Virtualization Engineer
Valiant Solutions, LLC
Springfield, VA · St. Louis, MO
Valiant Solutions is seeking a Citrix Software Virtualization Engineer to join our rapidly growing and innovative team!
Added 14 mins ago
Network Engineer
Valiant Solutions, LLC
Springfield, VA, VA
Valiant Solutions is seeking a Network Engineer to join our rapidly growing and innovative team!
Added 14 mins ago
IEC Engineer
Valiant Solutions, LLC
Springfield, VA, VA
Valiant Solutions is seeking an IEC Engineer to join our rapidly growing and innovative team!
Added 20 mins ago
Software Engineer III
Pearson
Helena, MT
This Software Engineer position is responsible for analysis, design, implementation, unit testing, and quality engineering to produce and maintain high-quality software solutions.
Added 20 mins ago
O
Senior Data Systems Software Engineer - Exadata Database
Oracle
Helena, MT
- $85,400 to $209,500 USD / year
Added 24 mins ago
QA Test Engineer, Industrial
Jobgether
Remote, United States
This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a QA Test Engineer, Industrial based in United States .
Added 24 mins ago
DevOps Architect
Jobgether
Remote, United States
Nice to have: AWS Certified Solutions Architect – Professional or AWS Certified DevOps Engineer – Professional.
Added 36 mins ago
Senior Integration Engineer – AI - Tax And Audit AI
Thomson Reuters (Tax & Accounting) Inc
Brooklyn, NY · Frisco, TX · Chicago, IL · Ann Arbor, MI · Eagan, MN
Help bring AI into the systems tax and audit professionals rely on every day. As a Senior Integration Engineer, you will connect AI solutions with Thomson Reuters products and client…
Added 36 mins ago
Senior Tax & Audit AI Engineer, FDE
Thomson Reuters (Tax & Accounting) Inc
Brooklyn, NY · Frisco, TX · Chicago, IL · Ann Arbor, MI · Eagan, MN
Added 44 mins ago
Network Engineer
Valiant Solutions, LLC
Lorton, VA
Valiant Solutions is seeking a Network Engineer to join our rapidly growing and innovative team!
Added 44 mins ago
Lead Firewall Engineer
Valiant Solutions, LLC
Springfield, VA, VA
Valiant Solutions is seeking a Lead Firewall Engineer to join our rapidly growing and innovative team!
Added 44 mins ago
Endpoint Security Engineer
Valiant Solutions, LLC
Springfield, VA, VA · St. Louis, MO
Valiant Solutions is seeking an Endpoint Security Engineer to join our rapidly growing and innovative team!
Added 44 mins ago
Cybersecurity Implementation Engineer
Valiant Solutions, LLC
Springfield, VA, VA
Valiant Solutions is seeking a Cybersecurity Implementation Engineer to join our rapidly growing and innovative team!
Added 44 mins ago
Cyber Data Analysis Engineer
Valiant Solutions, LLC
Springfield, VA
Valiant Solutions is seeking a Cyber Data Analysis Engineer to join our rapidly growing and innovative team!
Added 47 mins ago
C
Applied AI Engineer (Forward Deployed) [NYC or SF]
Concurrence
New York City, NY
- $200,000 to $260,000 USD / year
As a Senior Applied AI Engineer, you own an entire customer use case, not a ticket or a slice of one. You take a deployment from brief to production. You make the architecture calls inside…
Added 1 hour ago
H
Software Systems Engineer - GitHub Enterprise
HP
Vancouver
- $105,050 to $161,800 USD / year
…Kubernetes infrastructure. You’ll work at the intersection of developer experience, platform engineering, and AI-driven productivity, partnering with cross-functional teams to solve…

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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