New

Principal Software Engineer

Remote, USA

At Two Six Technologies, we build, deploy, and implement innovative products that solve the world’s most complex challenges today. Through unrivaled collaboration and unwavering trust, we push the boundaries of what’s possible to empower our team and support our customers in building a safer global future.

Principal Software Engineer

Two Six Technologies is looking for an experienced Principal Software Engineer to join the Sigma product engineering team. You will be a key contributor to the evolution of this product, adding AI-powered features while using AI-assisted development techniques to maximize the speed at which we release features that are complete, resilient, and secure. It is an exciting opportunity to leverage the latest technologies to make a real-world impact.

You should be comfortable taking on complex technical problems, dealing with ambiguity, forging technical strategies, crafting novel approaches to difficult challenges, and investigating and leveraging the latest AI tools to meet those objectives. Our small, remote team will give you the opportunity for outsized impact. As a Principal-level AI Software Engineer, you will actively participate in the design, build, test, implementation, and sustainment phases of product development, focused on advancing end-user operational outcomes while maintaining security and privacy. Your primary responsibility will be to leverage AI coding tools to build, test, and maintain the applications, services, APIs, and user interfaces that comprise this highly complex, multi-tier, AI-enabled software platform.

To be considered for this role, you must have experience using AI coding tools to design, develop, test, and deploy features for a production application. The ideal candidate is both a strong, independent contributor, and a teammate; honesty, reliability, and trustworthiness are expected of everyone on the team.

About Sigma
Sigma is a sensor-agnostic, mission-critical CBRNE SaaS platform built by Two Six Technologies, serving government and commercial users in radiological/nuclear detection. Our small, high-autonomy team ships production software using an agentic development model: engineers work alongside specialized AI agents for everything from architecture design to test generation to domain research. We are migrating from Java to Go on the backend, run multiple agentic AI stacks, and operate a structured knowledge system that keeps both humans and agents aligned.
This is not a team where AI is a side project, it is how we build. Real product, real customers, real mission.

This is a fully remote position with flexibility to manage your day around collaboration with your team.

What you will Do:
• Actively participate in all phases of the software development lifecycle, regularly contributing code and reviewing code contributed by agents and the rest of the team
• Design, build, test, implement, and maintain features, capabilities, and fixes, end-to-end (frontend, backend, and DevOps) within our agent-paired workflow
• Develop full software stack features, applying UX principles to the UI, along with backend development, DB design, and AI integration
• Stay current with the latest AI-powered software engineering technologies, evaluating them for the product and leveraging them wherever appropriate
• Review and elevate AI agent output, critically evaluate code, specs, and analysis; catch what automation misses; enforce quality gates
• Be a key contributor to the Java to Go migration, including shadow-mode validation, and contract testing between legacy and new services
• Collaborate with Product Management and Customer Success to identify and address customer requirements, issues, and requests
• Advise on the feasibility of technical requirements, schedule considerations, and potential risk for proposed new development work
• Participate in building out, updating, and refining the product vision, plan, and roadmap
• Leverage industry standards and best practices to regularly assess and address technical debt, particularly in consideration of cost-savings efforts and strategies
• Collaborate with the DevOps team to implement, refine, and maintain infrastructure stability and availability, as well as continuous integration and deployment pipelines
• Feed the structured knowledge base: distill decisions, designs, and trade-offs into agent-readable markdown so agents and teammates can reason about them
• Follow TDD practices, writing tests before code as a default, not an afterthought
• Mentor and learn from an experienced product development team

What you will need (basic qualifications):
• Bachelor’s degree in Computer Science, Engineering, or a related field, plus multiple years of professional software engineering experience. In lieu of degree, comparable experience will be considered.
• Extensive experience writing production-level Go using AI-enabled tools and workflows
• Practical experience using AI coding tools (e.g., Claude Code, Copilot, Cursor, or equivalent) to design, build, and test a mission-critical application that has run in production with an active user base.
• Experience with large-scale (terabytes) database development, data modeling, mapping and testing. Must have Postgres and non-relational databases experience
• Experience developing containerized applications using Docker and Kubernetes
• Experience working with event-driven architecture
• Practical experience designing, deploying, and tuning production systems running in AWS or a similar cloud computing environment
• Experience with extracting, transforming, and loading (ETL) complex datasets
• Experience finding and using open-source libraries where appropriate
• Proficiency with automated unit, integration, and functional testing
• Strong code review and troubleshooting instincts, catching subtle bugs, security issues, and design drift in both human- and agent-written code
• Knowledge of which tools and technologies are currently best practice for a given problem, with the ability to consider solutions beyond those
• Ability to work in a fully remote team with a diverse set of skills and life experiences
• Ability to communicate ideas successfully, both verbally and in writing, with people at all levels of technical expertise, including non-technical colleagues
• Ability to creatively solve problems and to learn quickly and independently

Nice if you Have:

• Experience with migrations from legacy systems to modern architectures (particularly Java to Go)
• Experience with Java, Kafka, or Cassandra
• Experience with CBRNE, defense/IC, or sensor-integration domains
• Familiarity with protobuf/gRPC, Docker Compose, GitHub Actions CI/CD
• Experience building or managing structured knowledge bases for AI agent consumption

Clearance Requirement:
• U.S. security clearance (or eligibility) is a plus but not required

#LI-JB1

 

Two Six Technologies is committed to providing competitive and comprehensive compensation packages that reflect the value we place on our employees and their contributions. We believe in rewarding skills, experience, and performance. Our offerings include but are not limited to, medical, dental, and vision insurance, life and disability insurance, retirement benefits, paid leave, tuition assistance and professional development.

The projected salary range listed for this position is annualized. This is a general guideline and not a guarantee of salary. Salary is one component of our total compensation package and the specific salary offered is determined by various factors, including, but not limited to education, experience, knowledge, skills, geographic location, as well as contract specific affordability and organizational requirements.

Salary Range

$173,808 - $225,000 USD

Looking for other great opportunities? Check out Two Six Technologies Opportunities for all our Company’s current openings! 

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