Senior Software Engineer - Golang

Litmus; United States; Hybrid; USD 140,000 - 200,000; Full time

Job summary

Litmus is seeking a Senior Software Engineer to build southbound connectors for PLCs and OT systems, enabling real-time data exchange between Litmus Edge and IIoT devices. You’ll design, implement, and maintain robust connectors across protocols such as OPC-UA, Modbus, EtherNet/IP, PROFINET, and DNP3.

You’ll also enable IIoT protocols like MQTT, CoAP, and SOAP, plus streaming through WebSockets and HTTP/2, while ensuring security, reliability, and scalability in industrial environments.

Qualifications

• Bachelor’s or Master’s degree in Computer Science, Software Engineering, Electrical Engineering, or a related field.
• 5+ years of relevant software engineering experience.
• Strong proficiency in C++ with Golang experience desirable.
• Experience developing southbound connectors for PLCs and OT systems with OPC-UA/Modbus/EtherNet/IP/PROFINET knowledge.

Responsibilities

• Develop C++ and Golang-based southbound connectors communicating with PLCs and industrial control systems using OPC-UA, Modbus, EtherNet/IP, PROFINET, DNP3.
• Implement support for IIoT protocols like MQTT, CoAP, SOAP for industrial devices.
• Build connectors for streaming protocols (WebSockets, HTTP/2) for real-time data exchange.
• Ensure robustness with error handling, fault tolerance, and security in OT environments.
• Collaborate with product, OT engineers, and other developers to deliver integration solutions.
• Conduct unit, integration, and hardware-in-the-loop testing to validate connectors.
• Document APIs and connectors for internal and customer use.
• Monitor performance, logs, and metrics to troubleshoot issues.

Skills

C++

Golang

Industrial protocols

Real-time networking

Education

Bachelor’s or Master’s in CS/EE

Tools

Git

CI/CD

Job description

Who is Litmus

Litmus is building the data foundation that powers industrial AI.

AI doesn’t work without real-world, contextualized data - Litmus makes that data usable. As AI adoption accelerates, most industrial environments still can’t access or use their operational data. We solve that gap.

We’re a growth-stage software company helping manufacturers access, structure, and use real-time data from machines, systems, and sensors at the edge. Our platform sits at the intersection of edge computing, AI, and industrial operations, enabling some of the world’s largest companies to run operations in real time, reduce downtime, and optimize production.

Backed by leading investors and trusted by global manufacturers and partners like Google, Microsoft, Dell, Oracle, and Mitsubishi, Litmus is powering the shift toward software-defined manufacturing.

Why join Litmus

Build the infrastructure that makes industrial AI possible

AI is moving beyond the cloud and into the physical world. At Litmus, you’ll build the infrastructure that enables real-time data to power AI and machine learning systems in production environments.

Work on problems where software meets the real world

Most AI systems fail without access to real-world data. You’ll build the layer that makes them viable in production. We solve challenges at the intersection of distributed systems, real-time data, and industrial constraints — where reliability, scale, and performance are non-negotiable.

Have real impact, fast

You’ll work on systems used by real customers in production, with direct impact on product and company trajectory. As a scaling company, we move quickly. You’ll have ownership, visibility, and the ability to shape both product and company as we scale.

Join a high-performance team

We’re building a team that holds a high bar and pushes each other to improve. You’ll work alongside experienced operators, engineers, and leaders who have done this before and are building again at scale. We hire people who take ownership, move quickly, and care about outcomes. No passengers.

Our culture

At Litmus, the team is collaborative, curious, and low ego. People are scrappy, take ownership, and look for ways to make an impact. We value empathy just as much as execution, whether that’s in how we build, how we communicate, or how we support each other.

We’re a growing company, so things move quickly and not everything is perfectly defined. If you enjoy figuring things out, working closely with others, and making steady progress, you’ll do well here.

Description

• As a Senior Software Engineer specializing in C++ and Golang, you will play a pivotal role in developing southbound connectors for communication with PLCs and industrial control systems, enabling seamless data exchange between our Litmus Edge Products and a diverse range of IIoT devices, industrial protocols, and operational technology systems.

• Your primary responsibility will be to design, implement, and maintain robust connectors that ensure the reliability, security, and efficiency of communication between our software and the operational technology (OT) layer. Your work will be essential in enabling our products to scale and adapt to ever-evolving industrial environments.

What you will do:

1. Develop C++ and Golang-based southbound connectors that communicate directly with PLCs and industrial control systems using protocols such as OPC-UA, Modbus, EtherNet/IP, PROFINET, and DNP3.

2. Implement support for IIoT protocols such as MQTT, CoAP, and SOAP, enabling effective communication with industrial devices and sensors.

3. Build connectors for streaming protocols such as WebSockets and HTTP/2, enabling real-time data streaming and communication with external systems.

4. Implement robust error handling and fault-tolerance mechanisms to ensure connectors are resilient to failures in OT environments, delivering a seamless user experience.

5. Collaborate with cross-functional teams — including product managers, OT/controls engineers, and other developers — to understand requirements and deliver high-quality integration solutions.

6. Conduct thorough testing, including unit tests, integration tests, and hardware-in-the-loop tests, to validate the functionality and performance of southbound connectors.

7. Optimize code and apply best practices to enhance connector performance, latency, and scalability.

8. Provide clear and comprehensive technical documentation for all connectors and APIs, enabling seamless adoption by other team members and customers.

9. Monitor connector performance, track metrics, and implement logging practices to troubleshoot and resolve issues efficiently.

10. Stay current with advancements in the C++, Golang, and industrial automation ecosystems, continuously developing your skills and knowledge.

11. Contribute to the development of our open-source projects, sharing expertise with the wider developer community.

What you will bring:

1. Bachelor’s or Master’s degree in Computer Science, Software Engineering, Electrical Engineering, or a related field.

2. Proven experience as a Software Engineer with a minimum of 5+ years of relevant work experience.

3. Strong proficiency in C++ with Golang experience highly desirable.

4. Demonstrated experience developing southbound connectors for PLCs and industrial control systems, with hands‑on knowledge of industrial protocols such as OPC-UA, Modbus, EtherNet/IP, or PROFINET.

5. Deep understanding of networking concepts, real-time communication, and industrial automation environments.

6. Experience implementing support for IIoT protocols is highly desirable.

7. Solid working knowledge of data serialization, error handling, and security principles in integration projects — 5+ years of experience preferred.

8. 5+ years of experience with version control systems (e.g., Git) and collaborative development practices.

9. Excellent problem-solving skills and the ability to analyze complex integration challenges in OT environments.

10. Strong communication skills and the ability to work collaboratively with cross-functional teams including engineers from both software and industrial automation backgrounds.

If you are a motivated, innovative, and results-oriented engineer with a passion for bridging the gap between industrial control systems and modern edge computing infrastructure, we encourage you to apply. Join our dynamic team and play a crucial role in shaping the future of Litmus Automation as a leading player in the Industrial Internet of Things space..

This position is hybrid in Toronto and Santa Clara. Full remote is possible for the right candidate.

Litmus Automation is an equal opportunity employer, committed to fostering an inclusive and diverse workplace environment. We celebrate individuality and believe that diverse perspectives lead to innovation.