Sustainment Software Engineer

Castello Systems, Inc.; Corridor North (MD); On-site; USD 90,000 - 130,000; Full time

Job summary

Castello Systems, Inc. is seeking a software developer to sustain, enhance, and modernize mission-critical security applications supporting essential operations.

You will contribute to front-end applications using TypeScript, Angular, and Node.js while collaborating with leads and stakeholders to deliver scalable, user-focused solutions. Engage in requirements analysis, design, development, testing, troubleshooting, deployment and production support to improve system functionality, performance,

Qualifications

• Experience building front-end applications with modern JS frameworks.
• Ability to collaborate with technical leads and stakeholders to deliver reliable, scalable solutions.
• Familiarity with full SDLC from requirements to deployment and production support.

Responsibilities

• Develop and maintain front-end applications using TypeScript, Angular and Node.js.
• Collaborate with developers, leads and stakeholders to improve functionality, performance and user experience.
• Contribute across the full software lifecycle from requirements analysis to production support.

Tools

Typescript

Javascript

Angular

NX

Express.js

Node.js

AWS

MongoDB

Docker/Containerization

UX Design

Job description

• Join a high-performing team with a meaningful mission. Be part of an established team responsible for sustaining, enhancing, and modernizing mission-critical security applications that support essential operational functions across the enterprise.
• Contribute to the development, maintenance and continuous improvement of front-end applications using technologies such as JavaScript, Angular, and Node.js. Partner with developers, technical leads, and stakeholders to deliver reliable, scalable, and user-focused solutions.
• Make an impact across the full software development lifecycle. Engage in requirements analysis, design, development, testing, troubleshooting, deployment, and production support. Help identify and implement opportunities to enhance system functionality, performance, and the overall user experience.
• Work in a dynamic, fast-paced environment where you’ll have opportunities to tackle complex problems, implement meaningful system enhancements, and contribute to modernization initiatives that directly support mission success.
• Lead assigned tasks and projects while balancing independent problem-solving with collaboration across cross-functional teams. We’re looking for someone who is self-motivated, adaptable, and excited to contribute both independently and as part of a larger development team.
• Collaborate with technical leads and team members to evaluate emerging technologies, strengthen development practices, and drive the continued evolution of critical sustainment systems.

Technology Stack:

• Typescript
• Javascript
• Angular
• NX
• Express.js
• Node.js
• AWS (CloudFormation,DocumentDb,ECS/EKS,EC2,Cloudwatch)
• MongoDB
• Docker/Containerization
• UX Design