L3Harris is dedicated to recruiting and developing high-performing talent who are passionate about what they do. Our employees are unified in a shared dedication to our customers’ mission and quest for professional growth. L3Harris provides an inclusive, engaging environment designed to empower employees and promote work-life success. Fundamental to our culture is an unwavering focus on values, dedication to our communities, and commitment to excellence in everything we do.

L3Harris is the Trusted Disruptor in defense tech. With customers’ mission-critical needs always in mind, our employees deliver end-to-end technology solutions connecting the space, air, land, sea and cyber domains in the interest of national security.

Job Title: Full Stack Software Engineer

Job Location: Sydney, Canberra

Job Description:

Working at Trenchant means working alongside the best security researchers and product engineers from across the security research and intelligence communities. You will be engaged on the most challenging problems in the toughest environments and delivering solutions supporting the cutting edge of cyber security research.

We are seeking a highly motivated and experienced Full-Stack Software Engineer with deep expertise across a range of technologies. This role requires a unique blend of technical acumen, leadership abilities, and the discipline to deliver high-quality software under tight deadlines.

We are a small team that achieves world-changing results and is driven to provide unparalleled cyber capability by utilising technical prowess, innovation and our commitment to a noble mission.

The Senior Full Stack Engineer's role is to engineer, design, execute, assess, and troubleshoot software programs and applications. This includes configuring, coding, developing, and documenting software specifications throughout the project life cycle. The individual will be responsible for designing, implementing, and deploying distributed server-side solutions and user interfaces.

Essential Functions

• Participate in all phases of the software development lifecycle (SDLC), from requirements gathering and design to testing, deployment, maintenance, and documentation.
• Collaborate within globally distributed, cross-functional Agile teams, engaging closely with product managers, team members, and stakeholders.
• Diagnose, troubleshoot, and resolve software defects and performance issues across the technology stack.
• Ensure all code is well-tested using unit, integration, and system-level testing methodologies.
• Stay current with the latest software development trends, industry best practices, and cybersecurity protocols.
• Contribute to improving development processes, best practices, and team knowledge through code reviews and process enhancement discussions.
• Document technical solutions and prepare end user manuals as required.

Technical Responsibilities

• Design, develop, and maintain secure, scalable, and maintainable codebases using C# .NET, Python, and Angular.
• Architect, build, and optimize backend services, APIs, and robust interfaces for API interactions, SDKs, and client-facing features.
• Develop and maintain web user interfaces using Angular, focusing on usability, performance, and security.
• Administer and optimize PostgreSQL databases, including schema design, query optimization, and data migration.
• Engage in self-directed research to innovate and implement new product features aligned with industry standards.
• Participate in technical design discussions, code reviews, and continuous integration/delivery processes.

Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, or a related field—or demonstrated equivalent practical experience.
• Proven experience as a Full-Stack Software Engineer with a comprehensive project portfolio.
• Strong grasp of object-oriented programming principles, design patterns, and large distributed system architecture.
• Proficient in C#/.NET (5+), cross-platform development (Linux/Windows/MacOS), and relational databases (PostgreSQL).
• Hands-on experience with unit/integration testing, comprehensive documentation, API design and development.
• Familiarity with Python; TypeScript/JavaScript (especially Angular or similar frameworks); and performance/memory analysis tools.
• Comfortable with Source Control and CI/CD systems.
• Experience working in Agile environments (Scrum/Kanban) and with inter-process communication (e.g., TCP, SSL, RabbitMQ).
• Excellent analytical, problem-solving, and communication skills.
• Ability and eligibility to obtain and maintain a National Security clearance.

Preferred Additional Skills

• Background or strong understanding in UI/UX design and principles.
• Exposure to or hands-on experience with DevOps practices and toolchains.
• Familiarity with cybersecurity principles and secure coding best practices.
• Experience with event-driven frameworks (e.g., gRPC, SignalR) and containerization (Docker, Kubernetes).
• Knowledge of mobile application development for Android/iOS.
• Ability to read, interoperate, and understand lower-level code in C or C++.
• Experience working in distributed, secure, or high-availability system environments.

As an equal opportunities employer, L3Harris is committed to the equal treatment of all current and prospective employees and does not condone discrimination on the basis of age, disability, sex, sexual orientation, pregnancy and maternity, race or ethnicity, religion or belief, gender identity, or marriage and civil partnership.