Senior Software Engineer- full stack Java

REI Systems; United States; On-site; USD 120,000 - 180,000; Full time

Job summary

REI Systems is seeking a Senior Software Engineer to provide technical leadership for the design, development, testing, modernization, and operational support of complex enterprise applications for the ODOS Program.

The successful candidate will lead critical engineering decisions, mentor engineers, establish development practices, and collaborate with architecture, product, UX, QA, DevOps, database, and operations teams to deliver scalable, secure solutions.

Qualifications

• 7+ years of software development experience with advanced Java and Spring Boot.
• Advanced Angular or React and JavaScript expertise delivering complex full stack applications.
• Strong experience with RESTful APIs, microservices, distributed systems.

Responsibilities

• Lead design, development, testing, and modernization of complex enterprise apps.
• Mentor engineers and set development practices across teams.
• Collaborate with architecture, product, UX, QA, DevOps, and operations.
• Develop scalable backend services and enterprise integrations.
• Define scalable data models and database aspects (PostgreSQL/Oracle).
• Drive DevSecOps integration, CI/CD pipelines and automated testing.

Skills

Java

Spring Boot

Angular

React

JavaScript

RESTful APIs

Microservices

Full stack

Tools

Git/GitHub

Jenkins

CI/CD

Splunk

New Relic

PostgreSQL

Oracle SQL

JUnit

Selenium

Job description

Overview

REI Systems' mission is to deliver reliable, innovative technology solutions that advance Federal clients' missions and exceed their expectations. Our technologists and consultants are passionate about solving complex challenges that impact millions of lives. We take a Mindful Modernization® approach in delivering our services, including application modernization, grants management, case management systems, government data analytics, and advisory services. This approach, the REI Way, ensures mission impact by aligning our clients' strategic objectives with measurable outcomes through people, processes, and technology. We offer the same commitment to our employees by providing professional development, meaningful projects, and flexibility to spend time with family and friends. We believe employees are at their best when fulfilled in both their professional careers and their personal lives. Learn more at www.REIsystems.com. Employees voted REI Systems a Washington Post Top Workplace in 2015, 2016, 2018, 2020, 2021, 2022, 2023, 2024, and 2025!

Position Overview

REI Systems is seeking a Senior Software Engineer to provide technical leadership for the design, development, testing, modernization, and operational support of complex enterprise applications for the ODOS Program. The successful candidate will lead critical engineering decisions, establish development practices, mentor engineers, and collaborate with architecture, product, UX, QA, DevOps, database, and operations teams. This role requires advanced full stack expertise, strong production troubleshooting skills, and demonstrated leadership within enterprise-scale Agile and DevSecOps environments.

Responsibilities

Technical Leadership and Full Stack Engineering

• Lead the design, development, testing, and modernization of complex enterprise applications using Java, Spring Boot, Angular, React, and JavaScript.
• Design scalable backend services, business logic, microservices, RESTful APIs, and enterprise integrations.
• Lead development of reusable and maintainable Angular and React-based user interfaces and application components.
• Design integrations among front-end applications, backend services, databases, and external enterprise systems.
• Design and optimize PostgreSQL and Oracle SQL solutions, including complex queries, data-access patterns, and application data models.
• Lead modernization of legacy applications using modern Java, React, APIs, microservices, and cloud-native architectural patterns.
• Identify and address application scalability, reliability, maintainability, and performance concerns.

Architecture and Engineering

• Lead or provide significant input into application architecture and technical design decisions.
• Translate complex business, operational, and user requirements into scalable technical solutions.
• Define and promote software engineering patterns, coding standards, reusable components, and development best practices.
• Evaluate frameworks, technologies, development tools, and design patterns, and lead code and design reviews for complex functionality.
• Provide technical guidance and mentoring to junior and mid-level developers.
• Collaborate with enterprise architects, product owners, UX teams, QA engineers, DevOps engineers, database engineers, and other technical stakeholders.

Testing DevSecOps and CI CD

• Establish unit, integration, regression, and automated testing practices using JUnit, Cucumber, Selenium, TDD, and BDD where appropriate.
• Provide technical leadership for source-control, branching, pull-request, and code-review practices using Git/GitHub.
• Develop applications designed for automated build, test, deployment, and release through Jenkins and CI/CD pipelines.
• Partner with DevOps and infrastructure teams to improve deployment, reliability, observability, secure development, vulnerability remediation, and operational support.

Production Support and Observability

• Serve as a senior technical resource for complex production incidents and application performance issues.
• Use Splunk and New Relic to analyze logs, application traces, transaction performance, infrastructure metrics, errors, and system behavior during production incident triage.
• Lead root-cause analysis across application code, APIs, databases, integrations, infrastructure, and dependent services.
• Identify recurring failure patterns and recommend engineering changes to improve reliability, resiliency, observability, and performance.
• Partner with O&M, DevOps, infrastructure, database, and application teams to resolve high-impact issues and incorporate lessons learned into architecture, testing, monitoring, and engineering standards.

Qualifications

• 7+ years of software development experience with advanced Java and Spring Boot expertise.
• Advanced Angular or React and JavaScript expertise delivering complex full stack applications.
• Strong experience with RESTful APIs, microservices, distributed