Senior Software Engineer | Belfast | OpenNMS

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Senior Software Engineer | Belfast | OpenNMS Belfast, UK Job Description Posted Wednesday, March 18, 2026 at 4:00 AM At OpenNMS, a wholly owned subsidiary of NantHealth, we are looking for the best people who share our deep passion for collaboration and innovation, and our commitment to open source. OpenNMS is the world’s first fully open source enterprise-grade network service monitoring platform, and hundreds of enterprises are using it every day. Our people play a critical role in helping us deliver on our commitments through the work, talents and focus they bring to their role. Are you ready to join our community? To ensure we can provide the best in network monitoring solutions, we focus on building the best team. Through holding true to the core NantHealth values – clarity, empathy, collaboration, integrity, a sense of community, and a pioneering approach – we are creating a vibrant culture where ideas can blossom, people can thrive, and success can flourish. The OpenNMS Group is seeking a skilled and passionate Senior Software Engineer to join our growing team focused on building and growing our open-source Network Monitoring Solution in use by numerous Fortune 500 companies. This position offers the flexibility to work remotely in either the United States or Belfast, Northern Ireland, dependent on work authorization. Responsibilities include, but are not limited to:
Help architect, design, and develop scalable features to meet product deliverables. Collaborate with other developers, architects, QA, devops and product management teams. Write well-designed, testable code including unit tests and basic documentation. Integrate software components into a fully functional software system. Be a part of discussions about code design, architecture, and refactoring to balance technical debt against delivering functionality. Review code and mentor other engineers. Work with little or no supervision. Apply software engineering best practices across the development lifecycle, including agile methodologies, coding standards, code reviews, source management, build processes, testing, and operations
Education & Experience Qualifications:
Bachelor’s degree (preferably in Computer Science or a related field), although commensurate experience will be considered in lieu of degree Advanced level experience in Java (6+ years)
Knowledge, Skills, and Abilities:
Must have a “can do” attitude and a hacker mindset to make things work in a complex product environment Experience having designed, implemented, and delivered, highly performant and scalable, software to a large customer base successfully. Solid knowledge of SQL and NoSQL data stores and efficient data schemas Understanding of message systems such as Kafka, ActiveMQ Solid understanding of IP networking principles and network/application security Experience working in Agile environment. General DevOps knowledge: CI/CD, automation, build, deployment Working knowledge with Linux/UNIX and familiarity with shell scripting
"Bonus Points" if you have the following skills:
OSGi and/or Karaf Monitoring Systems Time Series DB
The salary range for applicable Belfast-based (Northern Ireland) applicants is below. Exact rate will be determined based on experiences and skillset, as determined throughout the interview process. We value each of our employee’s total wellness. From robust medical, dental, and vision insurance, to financial planning assistance, to physical and mental wellness discounts, including an optional annual subscription to the Headspace app and unlimited access to our online learning platform, we understand that our company succeeds when our employees succeed as individuals. Additional notable benefits include:
Paid Time Off (hourly) / Flex Time Off (salaried) programs for Full Time employees Growth and Development opportunities 401(k), including a 3% company match Paid Holidays Paid Parental Leave, including a flexible return-to-work program Employee Assistance Program Discounts on popular cell phone plan providers Life & Disability Insurance Travel Assistance Education Assistance Program And much more!
OpenNMS is a wholly-owned subsidiary of NantHealth. NantHealth and OpenNMS provide equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training. #J-18808-Ljbffr
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Location:
Belfast
Job Type:
FullTime

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