Penta is seeking a highly‑motivated Software Engineer to join our (Modeling and Simulation Contract - Framework and Tools) MASC-F Objective Simulation Framework (OSF) development team. The candidate will design, develop, test, and field C++, Java (Spring Boot), and TypeScript + React software to support mission‑critical missile‑defense systems operating in cloud, on-prem, and hybrid test environments. This is a Senior-Level Development role position that requires strong technical depth, proven delivery in an Agile environment, and the ability to work directly with government stakeholders. Basic Requirements: Bachelor’s degree from an accredited college in a related discipline, with 14 years or more of professional experience; or 12 years of professional experience with a related Master’s degree; or 9 years of professional experience with a related PhD Clearance Level: Secret Support Location: On sight at Lockheed Martin in Huntsville, AL In this role, your responsibilities include: • Software Development • Write high‑performance, secure code in C++, Java, and Java Spring Boot • Build responsive front‑ends using TypeScript + React • Triage defects, produce root‑cause analysis, and drive fixes • Testing & Quality • Author unit tests (GoogleTest, JUnit, Jest) and integration tests • Participate in coding peer reviews • Containerization • Containerize applications with Docker • Agile Development • Operate in an agile team with other developers, product owners and SCRUM masters • Break down features into stories, and deliver on time • Lead and agile team or operate as a software Subject Matter Expert (SME) • Mentorship • Coach junior engineers on coding standards, Git workflows, container security, and test‑driven development Desired Skills Include: • Familiar with Scaled Agile Framework • Multi-core and multi-threaded programming • Experience programming network connections (protocol buffers, message brokers, UDP and TCP/IP interfaces) • Jira - issue tracking and agile project management, or similar tool • Cloud and Container Orchestration with Helm and Terraform