Senior Full Stack Developer (Hybrid​/On-Site

Senior Full Stack Developer (Hybrid/On-Site)

Location:

Suitland, MD Company: BLN
24

About Us:

We find strength in teamwork-a better you is a better us

BLN
24 is an award-winning Management Consulting Firm that supports the U.S. Federal Government in successfully achieving their mission and goals. Our service and solutions delivery start with understanding each client's end-state, and then seamlessly integrating within each Agency's organization to improve and enhance strategic and technical operations and deployments.

BLN
24 is seeking a hands-on Senior Full Stack Developer to support the U.S. Census Bureau in sustaining and modernizing applications that deliver critical economic data to the public. This role combines full-stack software engineering, Linux and on-premises infrastructure experience, data-oriented development, automated testing, and legacy modernization. The ideal candidate is curious about how the current system works, willing to investigate root causes, and comfortable working within Census IT constraints.

You will help reduce technical debt, support migration to RHEL 10 on bare-metal infrastructure, and deliver secure, maintainable solutions across the application stack. This is a working technical role: success requires someone who can think strategically, make sound engineering decisions, and personally dive into the code, configuration, testing, and troubleshooting.

• Problem-first and tool-agnostic. You can abstract the problem, evaluate constraints and tradeoffs, and select the right approach rather than forcing a preferred tool or framework.
• Grounded in engineering fundamentals. You may use AI-assisted tools responsibly, but you can design, code, test, review, and troubleshoot without relying on AI as a substitute for technical understanding.
• Curious and investigative. You seek to understand current system behavior, technical debt, operational pain points, and the reasons behind existing design decisions.
• Hands-on and accountable. You are willing to roll up your sleeves, work through ambiguity, and carry solutions from analysis through implementation and support.
• Independent and collaborative. You can own work with limited direction while communicating clearly and contributing effectively within a cross-functional team.

• Design, develop, test, modernize, and maintain full-stack applications using Python, JavaScript, HTML, CSS, and modern frontend technologies.
• Assess legacy applications and technical debt; define and implement incremental modernization, refactoring, dependency, and compatibility strategies aligned with the migration to RHEL 10 bare-metal environments.
• Administer, configure, deploy, and troubleshoot applications and supporting services in Red Hat Enterprise Linux and other Linux-based, on-premises environments.
• Automate infrastructure and application configuration using Ansible or comparable configuration-management approaches.
• Develop and maintain RESTful APIs, backend services, data-processing components, and PostgreSQL queries or data models.
• Build responsive, usable frontend experiences using Vue.js, React, Angular, or comparable frameworks, with attention to sound UI/UX practices.
• Create and maintain automated unit, integration, and end-to-end frontend tests using tools such as Playwright or comparable testing suites.
• Use Git Lab for source control, code review, issue tracking, collaborative workflows, and CI/CD pipeline execution.
• Apply secure coding, performance, reliability, observability, and maintainability practices throughout the software lifecycle.
• Investigate complex defects and production issues across application, operating-system, infrastructure, and data layers; identify root causes and implement durable fixes.
• Collaborate with developers, data scientists, analysts, product owners, infrastructure teams, and Census stakeholders to translate mission needs and technical constraints into working solutions.
• Produce clear technical documentation, participate in code and design reviews, and help improve team engineering standards and practices.

• Bachelor's degree in Computer Science, Information Technology, Engineering, Data Science, or a related field, or equivalent relevant education and professional experience.
• At least 6 years of professional software-development experience, including substantial hands-on full-stack development responsibility.
• Strong Python and JavaScript development skills, including experience building and maintaining production applications.
• Experience with at least one modern frontend framework such as Vue.js, React, or Angular, together with practical UI/UX implementation skills.
• Linux administration and IT infrastructure experience in on-premises or bare-metal environments; practical experience with RHEL or a comparable enterprise Linux distribution.
• Experience modernizing legacy applications, reducing technical debt, refactoring code, upgrading dependencies, or resolving operating-system…