Principal Software Engineer

Smith Arnold Partners; Danbury (CT); On-site; USD 170,000 - 190,000; Full time

Job summary

A global tech organization is seeking a Senior Principal Software Engineer in Danbury, Connecticut. This role involves designing real-time control software in C++ for high-performance systems, leading cross-functional teams, and driving architectural decisions. Candidates should have over 10 years of experience in software design, a strong background in mechatronics, and excellent communication skills. This position offers long-term career growth opportunities within a stable yet innovative company.

Qualifications

• 10+ years of experience in object-oriented software design and full-lifecycle development.
• Deep hands-on experience in C++ and real-time operating systems.
• Strong background in mechatronics or similar system-level environments.

Responsibilities

• Design and develop real-time control software in C++ for high-performance electromechanical systems.
• Lead cross-functional efforts across software, hardware, systems, and manufacturing.
• Guide architecture and technical strategy for multiple products.

Skills

C++

Object-oriented software design

Real-time operating systems

Mechatronics

Excellent communication

Education

BS or MS in Computer Science or a related field

Tools

.NET

Java

SQL Server

Oracle

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.

This is a role for engineers who want to build the core — not just bolt things on.

If you want to own complex systems, influence product direction, and work in an environment where your expertise is valued and your career can thrive — let’s talk.

Apply now or message us directly for a confidential conversation.

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.

Principle Principal Software Engineer

Location: Norwalk, CT

Salary - $170.000 – $190,000 +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 perform.

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