R & D Senior Software Engineer

Nucleus Security; Belfast; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

A cybersecurity startup is seeking a Senior Software Engineer to join their team in Belfast. The role involves developing an AI-driven vulnerability intelligence platform, collaborating with R&D and engineering teams, and building scalable systems using Python and TypeScript. Ideal candidates will have over 5 years of software engineering experience and a passion for cybersecurity, with strong skills in Django and React. Flexible remote working options and a focus on work-life balance are offered.

Benefits

Flexible remote work arrangements

Strong emphasis on work-life balance

Collaborative team environment

Qualifications

• 5+ years of professional software engineering experience.
• Strong backend and frontend development skills.
• Experience in a cloud environment, ideally AWS.

Responsibilities

• Collaborate with R&D and engineering teams on new technologies.
• Develop AI-driven vulnerability intelligence platform.
• Build scalable backend systems and dynamic user interfaces.

Skills

Backend development with Python

Frontend development with TypeScript and React

Experience with relational databases

Cloud environment experience

Docker and containerization

Creative problem-solving

Interest in cybersecurity

Tools

Django

MySQL

AWS

Agile methodologies

Job description

R&D Senior Software Engineer

Are you looking for more in life than just building another web app? Does upending cyber security resonate with you? We're a rapidly expanding cybersecurity startup revolutionizing vulnerability management for organizations of all sizes. For our customers, vulnerability management has always been a game of catch-up, with limited asset coverage and manual processes. Nucleus Security's primary mission is to create a fast, scalable platform that not only addresses these challenges but also makes vulnerability management simple, fun, and effortless. Currently, we're looking for a passionate Senior Python Software Engineer to join our growing team of engineers.

About Nucleus Security

Nucleus Security is transforming how security and development teams manage vulnerabilities at scale. Our platform unifies vulnerability data across scanners and environments, enabling organizations to prioritize and remediate vulnerabilities efficiently. We work with some of the most security-forward enterprises, empowering them with tools that accelerate secure software delivery and infrastructure hardening.

Role Overview

As a Senior Software Engineer in our Engineering team, you\'ll operate at the frontier of innovation, taking early ideas and high-level product vision and translating them into real, impactful software. You’ll work closely with product and security experts to design and build new features, services, and tools that push the boundaries of what’s possible in vulnerability management. This role offers a balanced blend of backend and frontend development, with approximately 50% of your time spent architecting scalable backend systems and the other 50% dedicated to crafting dynamic, user-focused frontend experiences.

What You’ll Do

• Collaborate with the Founders, multiple members of the R&D team, and the engineering team to develop new, experimental technologies as part of Nucleus’ innovation mission.
• Develop our new to market, AI-driven vulnerability intelligence platform and data feed. Take ownership of design, implementation, and deployment in conjunction with the R&D team.
• Collaborate with cross-functional teams across the globe, each working in different technology stacks.
• Build scalable backend systems using Python (Django) and MySQL or SingleStore.
• Develop dynamic and responsive user interfaces with TypeScript, React and Tailwind.
• Investigate and incorporate emerging trends in cybersecurity into product ideas.
• Write clean, maintainable, and well-tested code.
• Participate in architectural discussions and code reviews.

What We’re Looking For

Required Experience

• 5+ years of professional software engineering experience.
• Proven ability to thrive with minimal direction, especially in ambiguous or R&D-heavy environments.
• Strong backend development experience with Python, Django 4.2, and the Django REST Framework.
• Solid front-end development experience with TypeScript + React 19.
• Experience with relational databases, especially MySQL.
• Experience with Docker and containerization.
• Experience working in a cloud environment, ideally AWS.
• Familiarity with Agile/Scrum methodologies in a professional setting.
• Mindset: Creative thinker who enjoys solving hard problems and experimenting with novel solutions.
• Cyber Security Passion: Demonstrated interest or background in cybersecurity. Experience in vulnerability management, threat intelligence, or related domains is highly desirable.

Preferred Experience

• Engineering team lead experience
• Experience working on multiple projects at the same time
• Experience with big data analytical systems such as BigQuery, Redshift, Snowflake, Databricks, SingleStore, etc.
• Experience working with vulnerability scanning technologies on any part of the tech stack (e.g., SCA, SAST, DAST, IAST, VM Scanning, Container, etc.)
• Experience maintaining applications on Linux platforms in cloud environments.

Why You Should Be Excited

• Nucleus is a truly unique solution that’s defining a market AND making an actual impact.
• We’re biased, but you will get to work with one of the best teams in security. We have a lot to get done and we work extremely hard, but we have fun in the process.
• Work with a high-performing team that values creativity, autonomy, and innovation.
• Collaborate on meaningful products that improve the security posture of major organizations.
• Enjoy flexible remote work arrangements and a strong emphasis on work-life balance.

Additional Information

At Nucleus we are committed to achieving excellence in our field by combining diversity, collaboration, teamwork, and pride in our work. All qualified applicants will receive consideration for employment without regard to race, sex, color, religion, sexual orientation, gender identity, national origin, protected veteran status, or disability.