Cyber Security Researcher

CoreTech Security; City Of London; On-site; GBP 55,000 - 90,000; Full time

Benefits offered by this job

Private medical

Pension scheme

Death in service 4x salary

Relocation support

Training & conferences

O'Reilly books subscription

Company bonus

Job summary

CoreTech Security is recruiting a Cyber Security Researcher in London. You will join a highly technical team tackling diverse security challenges and delivering rapid prototypes and world-class research with real-world impact.

Ideal candidates combine deep curiosity with practical skills in reverse engineering, OS internals, and programming (C/C++/Python). Expect a fast-paced, collaborative environment that blends research with software engineering.

Qualifications

• Reverse engineering in IDA Pro or Ghidra; kernel and user-mode analysis.
• Wireshark and other network packet analysis tooling awareness.
• Ethical hacking and network/protocol analysis fundamentals.
• Experience with OS internals including Linux, Windows, and embedded systems.
• Familiarity with C, C++, Python and related tooling.

Responsibilities

• Tackle a wide range of challenging cyber security problems using diverse technologies.
• Conduct cutting-edge, world-leading research with practical real-world impact.
• Design niche solutions and propose new approaches to complex tasks.
• Collaborate with researchers and engineers to advance security research.

Skills

Reverse engineering

Wireshark

Ethical hacking

Network analysis

Hardware debugging

OS internals

Android/iOS internals

C/C++/Python

RF/SDR

Inquisitive mindset

Problem solver

Job description

Cyber Security Researcher

Location: London, Greater London, GB, EC2V 8

Start Date: September 17, 2026

Application Deadline: December 16, 2026

hackajob is partnering directly with CoreTech Security to hire for this role. CoreTech is looking for candidates with a STEM background, which may also include experience of research, cyber security or ethical hacking, to join our team. Our team is highly experienced, deeply technical and passionate about delivering quality solutions that blend rapid development, security research and software engineering skills.

Our Research team uses a wide range of tools, programming languages and emerging technologies to develop rapid prototypes, minimal viable products and world-class research that has meaningful real-world impact. The work is conducted in a fast-paced and dynamic environment, which results in solutions to some of the most complex cyber security challenges faced by the UK. This means no two days are the same and project requirements can quickly change based on your experience, understanding and input.

We are looking for skills in a variety of technologies, but experience with C, C++, Python, operating system internals, embedded systems, network packet analysis or machine learning would be advantageous. Equally, the role requires an inquisitive mindset, persistence, and enthusiasm for solving difficult research tasks, which can often appeal to those with a technologist, scientific or mathematical background.

As part of our team, you will:

• Work alongside hugely talented and respected researchers, vulnerability researchers and software engineers.
• Tackle a wide range of challenging problems using various technologies.
• Conduct cutting-edge, novel and world-leading research.
• Design and produce niche solutions with immediate real-world impact.
• Use your skills and experience to propose new ways of doing things.
• Continually learn new skills and technologies.

Ideal Candidate:

• Has a passion for cyber security and/or technology.
• Thrives on solving difficult and complex problems.
• Has a genuine interest in how technology works and how it can be applied in different ways.
• Enjoys sharing their knowledge and working with team members.
• Works with various technologies and programming languages, with uncertain outcomes, to achieve something new.

Experience and Skills:

• Reverse engineering in IDA Pro or Ghidra.
• Familiarity with Wireshark or other network packet analysis tooling.
• Ethical hacking.
• Network and protocol analysis.
• Hardware debugging (UART, JTAG, SWD).
• Knowledge of exploitation techniques and mitigations.
• Experience and knowledge of operating system internals, including Linux, Windows and embedded systems.
• Experience and knowledge of Android or iOS, and its internals.
• Familiarity with C, C++ or Python.
• RF technologies and Software Defined Radio.
• An inquisitive nature.
• Problem solver.

Levels:

We are recruiting at all grades from consultants through to highly experienced principal consultants. This vacancy is aimed at our consultant, through to our Senior level grades.

Benefits

Promotion & Holidays:

• Promotions are based on technical excellence and reviewed regularly.
• 25 days holiday per year (with bank holidays on top).
• Option to buy up to 5 days per year.
• Level up with an extra day of holiday per year, up to an extra 5 days, starting from 2 years' service.

Relocation & Training:

• Financial support to cover HMRC allowable costs of relocating if you're moving to the area.
• Training and development opportunities to support your career aspirations.
• O'Reilly books subscription providing access to a huge range of technical books.
• Regular events including internal technical conferences, company socials and pizza-fuelled lunchtime seminars.

Health & Wellbeing:

• Private medical including access to Private online GP, and a helpline for healthcare professionals.
• Physiotherapists, osteopaths or chiropractors for muscle, bone, and joint pain.
• Mental health support including counselling and consultations with psychologists and therapists.
• Annual health assessment.

Financial Benefits & Lifestyle:

• Company bonus scheme rewarding company success.
• 8% company contribution to pension with no minimum employee contribution.
• Death in Service cover of 4x base salary.
• Enhanced maternity/paternity/adoption leave: 12 weeks maternity leave at full pay, extended to 20 weeks from 2 years' service; 2 weeks paternity leave, extended to 4 weeks.
• Enhanced cycle-to-work scheme including the ability to purchase a bike over £1,000.

#s1-Gen

hackajob is partnering directly with CoreTech Security to hire for this role. CoreTech is looking for candidates with a STEM background, which may also include experience of research, cyber security or ethical hacking, to join our team. Our team is highly experienced, deeply technical and passionate about delivering quality solutions that blend rapid development, security research and software engineering skills. Our Research team uses a wide range of tools, programming languages and emerging technologies to develop rapid prototypes, minimal viable products and world-class research that has meaningful real-world impact. The work is conducted in a fast-paced and dynamic environment, which results in solutions to some of the most complex cyber security challenges faced by the UK. This means no two days are the same and project requirements can quickly change based on your experience, understanding and input. We are looking for skills in a variety of technologies, but experience with C, C++, Python, operating system internals, embedded systems, network packet analysis or machine learning would be advantageous. Equally, the role requires an inquisitive mindset, persistence, and enthusiasm for solving difficult research tasks, which can often appeal to those with a technologist, scientific or mathematical background. As part of our team, you will Work alongside hugely talented and respected researchers, vulnerability researchers and software engineers. Tackle a wide range of challenging problems using various technologies. Conduct cutting-edge, novel and world-leading research. Design and produce niche solutions with immediate real-world impact. Use your skills and experience to propose new ways of doing things. Continually learn new skills and technologies. An ideal candidate will Have a passion for cyber security and/or technology. Thrive?on solving difficult and complex problems. Have?a genuine interest in how technology works and how it can be applied in different ways. Enjoy sharing their knowledge and working with team members. Work with various technologies and programming languages, with uncertain outcomes, to achieve something new. Your Experience Reverse engineering in IDA Pro or Ghidra. Familiarity with Wireshark or other network packet analysis tooling. Ethical hacking. Network and protocol analysis. Hardware debugging (UART, JTAG, SWD). Knowledge of exploitation techniques and mitigations. Experience and knowledge of operating system internals, including Linux, Windows and embedded systems. Experience and knowledge of Android or iOS, and its internals. Familiarity with C, C++ or Python. RF technologies and Software Defined Radio. An inquisitive nature. Problem solver. We are recruiting at all grades from consultants through to highly experienced principal consultants. This vacancy is aimed at our consultant, through to our Senior level grades Work Benefits Promotions are based on technical excellence and reviewed regularly 25 days holiday per year (with bank holidays on top), option to buy up to 5 days per year Level up with an extra day of holiday per year, up to an extra 5 days, starting from 2 years' service We offer financial support to cover HMRC allowable costs of relocating if youre moving to the area Training and development opportunities to support your career aspirations O'Reilly books subscription which provides access to huge range of technical books Regular events including internal technical conferences, company socials and pizza-fuelled lunchtime seminars Free seasonal fruit, tea, coffee, milk, squash and hot chocolate Health Benefits - Private medical including access to Private online GP, and a helpline to speak with various healthcare professionals. Physiotherapists, osteopaths or chiropractors for muscle, bone, and joint pain. Mental health - counselling, and specialist consultations and treatment with psychologists and cognitive behavioural therapists. Annual Health assessment. Financial Benefits A company bonus scheme so that everybody is rewarded for company success. This is an annual award that is based on the company hitting its targeted forecast. We have achieved this every year to date. 8% company contribution to pension with no minimum requirement for employee contribution. Death in Service cover of 4x base salary. Lifestyle Benefits Enhanced maternity/paternity/adoption leave: 12 weeks maternity leave at full pay as soon as you join, further enhanced to 20 weeks full pay from 2 years service. 2 weeks paternity leave at full pay as soon as you join, further enhanced to 4 weeks full pay from 2 years service. Enhanced cycle-to-work scheme including the ability to purchase a bike over £1,000 (e-bikes, specialist cycles and trikes allowed).

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