Full Stack Engineer III

· Build and maintain responsive web applications using React, JavaScript, TypeScript, HTML5, and CSS3. · Build and maintain cross-platform mobile features using React Native. · Develop and maintain Backend-for-Frontend (BFF) services using Node.js, Express, and TypeScript to support tailored web and mobile data needs. · Integrate applications with enterprise systems and cloud-based services using RESTful APIs and GraphQL. · Collaborate with designers, product managers, architects, and stakeholders to implement intuitive, consistent user experiences. · Write clean, testable, and maintainable code using modern frameworks, libraries, and tooling. · Participate in code reviews, technical design discussions, and architectural decision-making. · Drive improvements in application performance, reliability, scalability, observability, and CI/CD pipelines. · Troubleshoot and resolve issues across web, mobile, backend, API, integration, and cloud layers. · Help define and evolve engineering best practices around service boundaries, reusable components, mobile development, cloud integration, and observability. · Mentor other engineers and contribute to a collaborative, high-quality engineering culture. · Leverage AI-assisted development tools where appropriate to improve productivity, code quality, and team workflows.

Work Requirements: US Citizen, GC Holders or Authorized to Work in the U.S. Full-stack development (React, Angular, Node.js, Java), API development, database mgmt (SQL, NoSQL), source control, CI/CD pipeline mgmt, testing (unit, integration, functional) Senior Full Stack Engineer - Web & Mobile Development We’re looking for a Senior Full Stack Engineer to help us design, build, and maintain high-quality web and mobile experiences. You’ll work closely with product managers, designers, architects, and partner teams to deliver performant, maintainable, and scalable applications across React web, React Native mobile, and Node.js/TypeScript backend services., · 5+ years of professional software development experience, including strong full-stack engineering experience. · Strong hands-on experience building modern web applications using React. · Production experience building mobile applications using React Native. · Proficient in JavaScript and TypeScript, with strong understanding of modern frontend and backend development practices. · Experience building and maintaining Node.js/TypeScript backend services, APIs, and BFF layers. · Strong understanding of API design, REST, GraphQL, microservices, and backend integration patterns. · Hands-on experience integrating applications with cloud services such as AWS, Azure, or GCP. · Familiarity with mobile debugging, performance profiling, and testing frameworks such as Jest, Cypress, Playwright, Detox, or Mocha. · Experience with Git, code reviews, branching strategies, CI/CD, and Agile/Scrum delivery practices. · Strong communication, ownership, collaboration, and problem-solving skills in distributed or remote-first teams. Nice-to-Have Skills: · Experience with micro frontends, module federation, and reusable component architecture. · Experience with native mobile development in Swift, Objective-C, Kotlin, or Java. · Knowledge of native module bridging between React Native and native iOS/Android code. · Familiarity with AWS cloud-native architecture patterns such as Lambda, API Gateway, S3, and CloudWatch. · Exposure to observability tools such as Datadog, CloudWatch, Dynatrace, Splunk, or similar platforms. · Familiarity with feature flags, analytics, A/B testing, experimentation, and mobile release cycles. · Experience with Docker, Kubernetes, or other containerization and orchestration tools. · Experience integrating or collaborating with AI coding agents such as GitHub Copilot, Claude, Cursor, or similar tools. Education and Experience: · Bachelor’s degree in Computer Science, Engineering, Information Technology, or equivalent practical experience. · A strong portfolio of web or mobile applications available in App Store is a plus

Company Description Founded in 1989, SOSi is among the largest private, founder-owned technology and services integrators in the defense and government services industry. We deli…