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Staff Software Engineer - UI

Harness

Harness

Software Engineering, Design
Belfast, UK
Posted on Nov 21, 2025
Harness is a high-growth company that is disrupting the software delivery market. Our mission is to enable the 30 million software developers in the world to deliver code to their users reliably, efficiently, securely and quickly, increasing customers’ pace of innovation while improving the developer experience. We offer solutions for every step of the software delivery lifecycle to build, test, secure, deploy and manage reliability, feature flags and cloud costs. The Harness Software Delivery Platform includes modules for CI, CD, Cloud Cost Management, Feature Flags, Service Reliability Management, Security Testing Orchestration, Chaos Engineering, Software Engineering Insights and continues to expand at an incredibly fast pace.
Harness is led by technologist and entrepreneur Jyoti Bansal, who founded AppDynamics and sold it to Cisco for $3.7B. We’re backed with $425M in venture financing from top-tier VC and strategic firms, including J.P. Morgan, Capital One Ventures, Citi Ventures, ServiceNow, Splunk Ventures, Norwest Venture Partners, Adage Capital Partners, Balyasny Asset Management, Gaingels, Harmonic Growth Partners, Menlo Ventures, IVP, Unusual Ventures, GV (formerly Google Ventures), Alkeon Capital, Battery Ventures, Sorenson Capital, Thomvest Ventures and Silicon Valley Bank.

Position Summary

Harness is an engineering and innovation first company. Our teams take pride in solving complex, computer science problems to empower Software and DevOps professionals.

This is an amazing opportunity to be a Staff Front-end Engineer in a high-growth, high-potential startup. In this role, you will play a pivotal role in architecting, designing, developing and delivering high quality front-end applications using ReactJS, HTML and CSS, that have a direct impact on the company’s product’s user experience.

Key Responsibilities

  • Lead the design and development of user-friendly and responsive user interfaces for the product using ReactJS, CSS and HTML.
  • Collaborate with cross functional teams that comprises of UX designers, Product Managers, Backend Engineers, Devops and Customer Success to create and ship elegant, high quality web applications.
  • Contribute to the integration of micro frontends to ensure modularity and scalability in the front end architecture.
  • Participate and contribute in key discussions related to user experience and end to end functional design of features.
  • Quickly understand and be able to diagnose/troubleshoot complex systems/code and own key pieces of the system.
  • Participate in peer reviews of specifications, design and code.
  • Mentor junior engineers and drive best practices in front-end development.
  • Own E2E from design, development to deployment of code using Docker and CI CD processes.
  • Drive improvements in overall development processes, quality, identify key technical gaps and work closely with engineering leadership to prioritize and address.
  • Stay updated with latest industry trends and emerging technologies to continuously improve our front end solutions.

Qualifications

  • Proven experience as a Front end Engineer, with Strong portfolio of work using ReactJS, Typescript, HTML, CSS.
  • Experience with performance debugging, front end caching and benchmarking.
  • Good problem solving and debugging skills.
  • Experience with building intuitive UI for analytics products will be a perfect fit.
  • Experience with building Micro-frontends and relevant patterns is a huge plus.
  • Familiarity with Docker and CI/CD processes is a huge plus.
  • Entrepreneurial spirit, priding yourself on getting things done with a high level of quality
  • Strong desire to work in an unstructured, fast moving startup environment

Bonus Qualifications

  • Experience with Infrastructure as code (Terraform etc)
  • Experience of contribution to Open Source Projects

Work Location

  • Belfast, Northern Ireland

Harness in the news:

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex or national origin.

Note on Fraudulent Recruiting/Offers

We have become aware that there may be fraudulent recruiting attempts being made by people posing as representatives of Harness. These scams may involve fake job postings, unsolicited emails, or messages claiming to be from our recruiters or hiring managers.

Please note, we do not ask for sensitive or financial information via chat, text, or social media, and any email communications will come from the domain @harness.io. Additionally, Harness will never ask for any payment, fee to be paid, or purchases to be made by a job applicant. All applicants are encouraged to apply directly to our open jobs via our website. Interviews are generally conducted via Zoom video conference unless the candidate requests other accommodations.

If you believe that you have been the target of an interview/offer scam by someone posing as a representative of Harness, please do not provide any personal or financial information and contact us immediately at security@harness.io. You can also find additional information about this type of scam and report any fraudulent employment offers via the Federal Trade Commission’s website (https://consumer.ftc.gov/articles/job-scams), or you can contact your local law enforcement agency.