Jobs in the United States

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Added 9 mins ago
Launch Operations Engineer (All levels)
Blue Origin Personnel, LLC
Space Coast, FL
Experience Levels with manufacturing, industrial, or process engineering. (3+ Level II Engineer, 5+ Level III Engineer, 8+ SR Level Engineer)
Added 10 mins ago
Research Engineer / Scientist, Pre-training
Anthropic
Remote, United States
…are aligned with human interests. We are seeking a Research Engineer to join our Pre-training team, responsible for developing the next generation of large language models. In this role,…
Added 26 mins ago
Improvement Engineer
Olin Corporation
US-TX-Freeport
The Improvement Engineer leads the plant-level improvement process by gathering and analyzing data, evaluating improvement opportunities, and implementing improvement projects. This role…
Added 35 mins ago
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Project Engineer
Actalent
BURBANK, CA
- $110,000 to $130,000 USD / year
Summary:The Project Engineer III leads aerospace product development projects from concept through production. This role works with engineering, manufacturing, and customers to ensure…
Added 39 mins ago
Digital Support Engineer
Roche
Indianapolis, IN
…exciting career opportunities. We encourage and support your development in areas of your interest which will prepare you for the next level in your career path. We know that people are…
Added 39 mins ago
Digital Solutions Engineer
Roche
Indianapolis, IN
…exciting career opportunities. We encourage and support your development in areas of your interest which will prepare you for the next level in your career path. We know that people are…
Added 48 mins ago
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Principal AI Engineer - Evinova
AstraZeneca
Gaithersburg, MD · Gaithersburg
- $144,648.8 to $189,851.55 USD / year
As Principal AI Engineer, you'll design and implement sophisticated agentic AI systems that power next-generation life sciences solutions. Working at the intersection of AI research and…
Added 56 mins ago
Principal Systems Engineer - Processing, Guidance, & Controls Engineers t
RTX Corporation
tucson, AZ
…businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and…
Added 56 mins ago
Sr. Systems Engineer - Processing, Guidance, & Controls Engineers
RTX Corporation
tucson, AZ
…businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and…
Added 56 mins ago
Systems Engineer II - Processing, Guidance, & Controls Engineers
RTX Corporation
tucson, AZ
…businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and…
Added 56 mins ago
AE
Campus Graduate Masters Summer Internship Program - 2027 AI Engineer, Enterprise Technology Services- Phoenix, AZ
American Express
Phoenix, AZ
- $24.05 to $63 USD / hour
At American Express, we empower future technologists to learn, innovate, and make an impact from day one. As an AI Engineer Intern in Enterprise Technology Services, you’ll join a 10-week…
Added 56 mins ago
AE
Campus Graduate Masters Summer Internship Program - 2027 Software Engineer, Enterprise Technology Services- Phoenix, AZ
American Express
Phoenix, AZ
- $24.05 to $63 USD / hour
At American Express, we empower future technologists to learn, innovate, and make an impact from day one. As a Software Engineer Intern, you’ll join a 10-week Summer Internship Program and…
Added 56 mins ago
AE
Campus Undergraduate Full-Time Engineer - 2027 AI Engineer I, Enterprise Technology Services- Phoenix, AZ
American Express
Phoenix, AZ
- $78,000 to $124,750 USD / year
- Full-time
At American Express, we empower technologists to learn, innovate, and make an impact from day one. As an AI Engineer I in Enterprise Technology Services, you’ll join a full-time graduate…
Added 56 mins ago
Application Engineer - DevOps & Engineering Tools
RTX Corporation
phoenix, AZ
…businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and…
Added 1 hour ago
Senior PostgreSQL Database Engineer
Valiant Solutions, LLC
St. Louis, MO
Valiant Solutions is seeking a Senior PostgreSQL Database Engineer to join our rapidly growing, innovative team!
Added 1 hour ago
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Supplier Quality Engineer
Actalent
Moorpark, CA
- $110,000 to $150,000 USD / year
Job Title: Supplier Quality EngineerJob DescriptionThe Supplier Quality Engineer supports and improves supplier quality performance by ensuring that purchased materials and components…
Added 1 hour ago
A
Signals Discipline Lead
AECOM
Pittsburgh, PA
- $160,000 to $200,000 USD / year
…systems. The successful candidate will support the design, development, and implementation of signal engineering solutions for rail and transit infrastructure projects. The role includes…
Added 1 hour ago
Principal SecOps & Observability Engineer (Clearance Secret or Top Secret)
Hewlett Packard Enterprise
Ft. Collins, CO · Montgomery, AL · Spring, TX · Oklahoma City, OK · All, MD · All, FL
Develops organization-wide architectures and methodologies for software systems design and development across multiple platforms and organizations within the Global Business Unit.
Added 1 hour ago
RS
Audio Engineer (A1) - Denver
Rhino Staging LLC
Denver, CO
- From $30 USD / hour
Rhino Staging is looking for Lead Audio Engineer(s) to support concert tours, festivals, corporate events and more in the greater Denver area. We work with some of the biggest production…
Added 1 hour 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 1 hour 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 1 hour 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 1 hour 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 1 hour 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 1 hour ago
Network Engineer
Valiant Solutions, LLC
Springfield, VA, VA
Valiant Solutions is seeking a Network Engineer to join our rapidly growing and innovative team!

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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