Software Developer, Senior

Posted:
8/25/2025, 6:07:41 AM

Location(s):
Illinois, United States ⋅ O'Fallon, Illinois, United States

Experience Level(s):
Senior

Field(s):
Software Engineering

Workplace Type:
Hybrid

Software Developer, Senior

The Opportunity: 

As a software developer, you play a pivotal role in an application’s functional life. From troubleshooting to fixing bugs, you use your operations and maintenance skills to ensure that things run smoothly. We’re looking for an experienced software sustainment engineer like you to apply your knowledge to our clients’ challenges and their legacy enterprise systems. 

As a software developer at Booz Allen, you’ll have an operational impact from day one. With a team of professionals, you’ll maintain applications and keep systems working. You and your team will use programming and scripting languages as you continuously enhance and maintain the applications, troubleshoot any issues that arise operationally, and upgrade the systems to meet security requirements. 

Most importantly, you’ll advise our clients on the best ways to improve and modernize the existing systems. Work with us to help us secure crucial systems while watching them grow and modernize.

Join us. The world can’t wait.

You Have: 

  • 4+ years of experience in Software Development, including maintaining and making minor changes to existing applications or keeping those systems working in a sustainment mode

  • 4+ years of experience with legacy enterprise systems

  • Experience with working in a microservices or distributed application environment 

  • Experience with workflows, web parts, site maintenance, APIs, and cloud platforms 

  • Experience with basic programming languages, technologies, tools, or web development stacks, and creating and testing modules and components for compliance to design specifications 

  • Experience with developing and testing interfaces between software products and products of other vendors 

  • Ability to lead design and code reviews and address findings within a collaborative, cross-functional team 

  • Secret clearance 

  • Bachelor’s degree

  • COMPTIA Security +, Certified Network Defender (CND), GIAC Security Essentials (GSEC), and Certified Secure Software Lifecycle Professional (CSSLP) Certifications

Nice If You Have: 

  • Experience with Java, Python, C#, C, C++, .NET, JavaScript, React, Angular, NodeJS, or PHP 

  • Experience with AWS, Azure, or Google Cloud Platform 

  • Ability to develop detailed program specifications and programs for software components  

  • Ability to debug, troubleshoot, monitor, and maintain the operation of application code 

  • Knowledge of DevOps, continuous integration, and continuous deployment 

  • Knowledge of shell scripting and automation 

Clearance:

Applicants selected will be subject to a security investigation and may need to meet eligibility requirements for access to classified information.  Secret clearance required.

Compensation

At Booz Allen, we celebrate your contributions, provide you with opportunities and choices, and support your total well-being. Our offerings include health, life, disability, financial, and retirement benefits, as well as paid leave, professional development, tuition assistance, work-life programs, and dependent care. Our recognition awards program acknowledges employees for exceptional performance and superior demonstration of our values. Full-time and part-time employees working at least 20 hours a week on a regular basis are eligible to participate in Booz Allen’s benefit programs. Individuals that do not meet the threshold are only eligible for select offerings, not inclusive of health benefits. We encourage you to learn more about our total benefits by visiting the Resource page on our Careers site and reviewing Our Employee Benefits page.

Salary at Booz Allen is determined by various factors, including but not limited to location, the individual’s particular combination of education, knowledge, skills, competencies, and experience, as well as contract-specific affordability and organizational requirements. The projected compensation range for this position is $86,800.00 to $198,000.00 (annualized USD). The estimate displayed represents the typical salary range for this position and is just one component of Booz Allen’s total compensation package for employees. This posting will close within 90 days from the Posting Date.

Identity Statement

As part of the application process, you are expected to be on camera during interviews and assessments. We reserve the right to take your picture to verify your identity and prevent fraud.

Work Model
Our people-first culture prioritizes the benefits of flexibility and collaboration, whether that happens in person or remotely.

  • If this position is listed as remote or hybrid, you’ll periodically work from a Booz Allen or client site facility.
  • If this position is listed as onsite, you’ll work with colleagues and clients in person, as needed for the specific role.

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to disability, status as a protected veteran or any other status protected by applicable federal, state, local, or international law.

Booz Allen

Website: https://www.boozallen.com/

Headquarter Location: Mclean, Virginia, United States

Employee Count: 10001+

Year Founded: 1914

IPO Status: Public

Last Funding Type: Post-IPO Debt

Industries: Consulting ⋅ Cyber Security ⋅ IT Infrastructure ⋅ Management Consulting ⋅ Security