Principal Software Engineer

Smith Arnold Partners; Norwalk (CT); On-site; USD 150,000 - 180,000; Full time

Job summary

Smith Arnold Partners in Norwalk, CT seeks a Senior Principal Software Engineer to architect and deliver real-time control software for high-performance electromechanical systems. You will lead cross-functional teams and influence product roadmaps with hands-on ownership and strategic impact.

The role demands 10+ years in object-oriented design, deep C++ experience, and a background in mechatronics or similar environments. On-site collaboration and strong communication are essential.

Qualifications

• 10+ years of object-oriented software design and full-lifecycle development.
• Deep hands-on experience in C++ and real-time operating systems (RTX).
• Strong background in mechatronics or similar system-level environments.
• Ability to lead multidisciplinary teams and drive projects through ambiguity to delivery.
• Excellent communication skills with engineers and stakeholders.
• BS or MS in Computer Science or a related field.

Responsibilities

• Design and develop real-time control software in C++ for large-scale, high-performance electromechanical systems.
• Lead cross-functional efforts across software, hardware, systems, and manufacturing.
• Guide architecture and technical strategy for multiple products and platforms.
• Debug and optimize at the system level—from code to motion control to hardware integration.
• Play a key role in roadmap planning and technical decision-making.

Skills

Leadership

Communication

Cross-functional collaboration

Team leadership

Education

BS or MS in Computer Science or related field

Tools

C++

RTX RTOS

Mechatronics

SQL Server

.NET/Java/ASP.NET

Job description

If you’re an experienced software engineer who wants to build things that actually move — fast, accurately, and at scale — this is a role worth considering.

We’re a well-established global tech organization that builds the software and systems behind some of the most advanced, high-speed electromechanical equipment in the industry. Our technology helps run the operations behind critical communications and logistics around the world.

Employee testimonials:

• Great environment in the office and backed by a larger company providing a stable and exciting work environment. The entire Staff is always willing to help and create a great culture.
• Productive and Fun Place to Work!
• Best company I have EVER worked for... They have accommodated to me beyond expectations.

Title: Principle Software Engineer

Location: Norwalk, CT

Salary - $150,000 – $180,000 +Bonus

Right now, we’re looking for a Senior Principal Software Engineer to take a leading role in architecting and delivering the software that powers our next generation of machine control systems. This is a hands-on, senior-level position where you’ll have real ownership, technical influence, and direct impact on the business.

Why This Role Stands Out:

• High Visibility: You won’t be buried in code no one sees — this role is front and center across engineering, product, and executive teams.
• Complex, Real-World Problems: This isn’t app development. You’ll be building control software for high-speed, precision-driven systems that integrate mechanical, electrical, and software components.
• Stability + Innovation: Join a company that’s been around for decades — but continues to evolve. The tech is serious, the teams are strong, and the roadmaps are ambitious.
• Long-Term Career Growth: This isn’t a stepping-stone job. It’s a long-term opportunity to lead, grow, and shape the future of how our machines performance

What You’ll Do:

• Design and develop real-time control software in C++ for large-scale, high-performance electromechanical systems
• Lead cross-functional efforts across software, hardware, systems, and manufacturing
• Guide architecture and technical strategy for multiple products and platforms
• Debug and optimize at the system level — from code to motion control to hardware integration
• Play a key role in roadmap planning and technical decision-making

What You Bring:

• 10+ years of experience in object-oriented software design and full-lifecycle development
• Deep hands-on experience in C++ and real-time operating systems (such as RTX)
• Strong background in mechatronics, machine control, or similar system-level environments
• Ability to lead multidisciplinary teams and drive projects through ambiguity to delivery
• Excellent communication skills — both with engineers and stakeholders
• BS or MS in Computer Science or a related field

Bonus Points:

• Experience with motion or servo motor control
• Exposure to .NET, Java, or ASP.NET
• Background in SQL Server, Oracle, or web-based service architecture
• Knowledge of industrial automation or paper-handling/mailing systems