Senior Software Engineer - Existing Accounts

About the Company A rapidly expanding technology organisation operating at the forefront of industrial automation and intelligent systems. The business partners with major global enterprises to transform complex operational environments through scalable, high-performance software solutions. With a strong focus on innovation and real-world impact, significant investment is being made into next-generation platforms that optimise efficiency across large-scale operations. The Opportunity An experienced Senior Software Engineer is required to join a high-performing engineering team. This is a full-stack role, playing a key part in designing and building robust, scalable applications that power mission-critical systems. The position offers the chance to collaborate with cross-functional teams, contribute to architectural decisions, and shape the future of sophisticated automation software. Location: Illinois Travel: Approximately 25-30% Key Responsibilities Design, develop, and maintain backend services using Go and Java. Build modern, user-facing applications using JavaScript, TypeScript, and leading web frameworks. Develop and optimise relational database structures, queries, and performance. Collaborate with engineers, project stakeholders, and delivery teams to define and implement technical solutions. Engage with client teams to support implementation, training, and evolving requirements. Produce clean, maintainable, and well-documented code aligned with best practices. Troubleshoot and enhance system performance, reliability, and scalability. Support deployment and testing of software both remotely and on-site. Contribute to code reviews, mentor junior engineers, and promote engineering excellence. Stay current with emerging technologies and recommend system improvements. Support ongoing operations, including occasional out-of-hours technical assistance. Required Experience & Skills Bachelor's degree in Computer Science, Engineering, or equivalent practical experience. 5+ years of professional software development experience. Strong proficiency in Go, Java, JavaScript, and TypeScript. Experience building production-grade applications across the full stack. Familiarity with modern frameworks such as React or Angular. Solid experience with relational databases (e.g., PostgreSQL, MySQL, Oracle), including optimisation and tuning. Working knowledge of Linux environments and networking fundamentals. Strong understanding of software design, data structures, and system architecture. Experience with Git and agile development practices. Excellent problem-solving and communication skills. Ability to work both independently and collaboratively in a fast-paced environment. Desirable Skills Experience with cloud platforms (AWS, Azure, or Google Cloud). Exposure to automation systems, robotics, or industrial technologies. Knowledge of containerisation tools such as Docker and Kubernetes. Familiarity with CI/CD pipelines and DevOps practices. Experience with NoSQL databases is advantageous. What's on Offer Competitive salary and performance-related bonus Comprehensive health, dental, and vision coverage Retirement savings plan with employer contribution Generous paid time off Life insurance and disability coverage Additional Information Applicants must be authorised to work in the United States. Visa sponsorship is not available for this position. Proactive Global is committed to equality in the workplace and is an equal opportunity employer. Proactive Global is acting as an Employment Business in relation to this vacancy. #J-18808-Ljbffr Proactive Technical Services