Software Engineer

Socket.dev; Annapolis (MD); Hybrid; USD 110,000 - 140,000; Full time

Benefits offered by this job

Comprehensive health coverage

Hybrid work environment

Advancement opportunities

Catered events, snacks, drinks

Birthday and life celebrations

Two annual parties

Job summary

FacilityOS is seeking a highly capable Back-End Engineer to contribute to backend web applications and services. You will work with legacy systems, apply solid architectural principles, and make thoughtful technical decisions to improve delivery throughput while maintaining quality.

The ideal candidate brings 4–6 years of backend .NET experience, strong judgment, and the ability to work independently while aligning with team standards and direction.

Qualifications

• 4–6+ years of backend web application development in .NET Framework/.NET Core using C#.
• Experience understanding legacy systems and integration points with limited ramp-up time.
• Experience contributing to legacy modernization and incremental replacement efforts, Strangler Fig pattern preferred.
• Strong object-oriented programming, design patterns, and clean code principles.
• Experience writing unit tests and practicing quality-focused development.

Responsibilities

• Design, develop, review, and maintain backend web applications and services across the FacilityOS platform.
• Understand platform architecture, legacy components, and modernization priorities.
• Collaborate with engineers and architects to align with delivery goals and architectural principles.
• Contribute to legacy modernization using incremental, low-risk approaches (e.g., Strangler Fig).
• Build maintainable, testable, and scalable backend solutions with established standards.
• Maintain high code quality through testing, code reviews, and static analysis.
• Troubleshoot production issues with root-cause analysis and sustainable fixes.
• Work with product stakeholders to support business operations and project delivery.
• Research and recommend architectural improvements for the platform.

Skills

Backend .NET / C#

RESTful services

Unit testing

Legacy modernization

Team collaboration

Tools

SQL Server

Azure / AWS

Git / CI

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 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 under the guidance of senior engineering and architecture direction.
• Quickly develop a working understanding of existing platform architecture, legacy components, integration points, and modernization priorities.
• Collaborate with senior engineers, architects, and the broader engineering team to make sound technical decisions aligned 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.
• Build maintainable, testable, and scalable backend solutions using object-oriented programming, design patterns, and established engineering standards.
• Maintain high code-quality standards through unit testing, peer code reviews, static code analysis, and consistent use of agreed-upon development practices.
• Participate actively in peer code reviews by providing constructive feedback and incorporating feedback from others.
• Troubleshoot and resolve application issues across environments, including staging and production, with a focus on 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 that could benefit the FacilityOS platform.

Skills and Qualifications

• Minimum of 4-6 years of proven experience in backend .NET Framework / .NET Core web application development using C#.
• Demonstrated ability to understand existing systems, legacy codebases, integration points, and business logic with limited ramp-up time.
• Practical experience contributing to legacy modernization, refactoring, or incremental replacement efforts; experience with the Strangler Fig pattern or similar modernization approaches is strongly preferred.
• Strong working knowledge of object-oriented programming, design patterns, and clean code principles.
• Experience writing unit tests and applying quality-focused development practices.
• Proven experience designing, building, and maintaining RESTful services.
• Experience working with cloud-native SaaS or PaaS applications.
• Solid knowledge of Microsoft SQL Server and T-SQL.
• Ability to make sound technical recommendations in collaboration with senior engineers and 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 assigned priorities and deliver outcomes with limited supervision.
• Strong team-player attitude with the ability to collaborate across engineering, product, and project stakeholders.

Why work at FacilityOS?

• Comprehensive health coverage
• 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 Canada or United States.

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.

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