At a Glance
- Tasks: Lead tech evaluations, develop software, and ensure security for critical systems.
- Company: Join deltaflare, the UK's leader in OT cybersecurity for essential services.
- Benefits: Enjoy a competitive salary, 25 days leave, pension contributions, and a MacBook.
- Other info: Dynamic role with opportunities for growth in a mission-driven environment.
- Why this job: Make a real impact on national infrastructure while working with cutting-edge technology.
- Qualifications: Experience in software engineering, security, and strong communication skills required.
The predicted salary is between 83000 - 95000 £ per year.
Requirements
- Several years hands-on engineering experience delivering complex technical and security work independently and to a high standard.
- Proven ability to review, critique and constructively challenge technical work produced by others.
- Strong working knowledge across networking, Linux, architectural security, infrastructure as code, containers and cloud platforms.
- Software development ability in at least one language, with the judgement to assess system-level impact of code produced by others.
- Clear technical communication skills, including the ability to engage credibly with customers, regulators and senior stakeholders.
- A degree in Computer Science, Software Engineering, Network Engineering, Cybersecurity or a related STEM discipline, or equivalent capability demonstrated through substantial industry, project-based or self-directed experience.
- Professional-level certifications such as CISSP, cloud security, professional-level cloud or ISC2 certifications.
- Experience in OT/ICS security, regulated industries or Critical National Infrastructure environments.
- Applied experience of NIS2, NCSC CAF, IEC 62443, OT/ICS protocols or architecture, or mentoring junior engineers.
Responsibilities
- Lead the evaluation and proving of new technology before delivery, including software development for proofs of concept, demonstrators and structured technical assessments.
- Iterate customer technical and security commitments into practical controls, configuration, software changes and mitigations for the systems you own.
- Provide independent technical challenge to Development and Assurance, reviewing source code, infrastructure-as-code and architecture against requirements and good practice.
- Front direct technical engagement with customers, regulators and industry bodies for owned systems and areas, preparing materials and evidence that stand up to scrutiny.
- Design, implement and maintain architectural controls across our AWS based systems, identifying, remediating and evidencing security and resilience issues across the business.
- Oversee and review work produced by Graduate Engineers and Engineers, giving constructive, standards-based feedback that raises the technical bar.
- Deepen your primary technical specialism while building cross-functional awareness across OT cybersecurity, cloud security, assurance and UK Critical National Infrastructure.
Technologies
- AWS
- Cloud
- Linux
- Mac Book
- Network
- Security
More
We are deltaflare, the UKs specialist in Operational Technology (OT) cybersecurity for Critical National Infrastructure operators.
We deliver NIS2 and CAF compliant protection across gas, electricity, water, renewable technology and transport networks, helping secure the systems that keep the country running.
We work where IT meets industrial reality, inside control rooms, substations and treatment works, supporting operators without disrupting essential services.
Our mission is to enable the safe and cyber secure operation of hyper-connected industrial systems, and our vision is a world where essential services can deliver digital transformation with confidence.
We value integrity, innovation, openness and being mission driven.
This Senior Software Engineer role sits within our Technology team, works mostly independently under the Head of Technology, and includes a salary of £83,000 to £95,000 per year, 25 days annual leave plus bank holidays, employer contributed pension, regular team and industry events, and a personal EC2-based Linux development environment with an Apple Mac Book for daily work.
The role is in person in London, Greater London.
- last updated 36 week of 2026
- #J-18808-Ljbffr
Senior Software and Security Engineer employer: deltaflare
At deltaflare, we pride ourselves on being a leading provider of innovative cyber security solutions, offering a dynamic work environment that fosters collaboration and creativity. Our commitment to employee growth is evident through continuous learning opportunities and a culture that values open communication and teamwork. Located in the vibrant tech hub of London, we provide our team with the unique advantage of working at the forefront of industrial cyber security while enjoying the rich cultural and professional benefits the city has to offer.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Software and Security Engineer
✨Join Local Tech Meetups
Get out there and mingle with fellow developers by joining local tech meetups. It’s a fantastic way to meet people who might be working at deltaflare or know someone who does. Plus, you can pick up some trendy tech skills and trends while you're at it!
✨Contribute to Open Source Projects
Show off your coding chops by jumping into open-source projects. Not only does this give you practical experience, but it also gets you noticed in the dev community. You'll create a killer portfolio that speaks volumes about your skills to deltaflare.
✨Tap into Online Developer Communities
Don’t underestimate the power of online developer communities like GitHub, Stack Overflow, and even Reddit. Participate in discussions, share your projects, and build your visibility. We can often find opportunities through these channels that can lead to a full-time gig at companies like deltaflare.
✨Explore Job Boards Specifically for Tech Roles
Keep your eyes peeled on job boards that focus on tech roles. Sites like TechCareers or Stack Overflow Jobs can often have listings for companies like deltaflare that might not show up on broader job sites. Make it a habit to check these regularly, and don’t hesitate to apply directly through our website!
We think you need these skills to ace Senior Software and Security Engineer
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at deltaflare.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at deltaflare and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at deltaflare
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If deltaflare uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
