Security Engineer (Software Engineering Focus) | Quantitative Analysis and Trading Leader

Techfellow Limited; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

Techfellow Limited is looking for a cybersecurity engineer in Greater London. The role demands 3-7 years of experience in security engineering, with strong scripting and programming skills in Python. You'll design and develop security tooling, collaborate across teams to improve security measures, and engage in vulnerability assessments. Ideal candidates will have technical generalist capabilities and a robust understanding of security best practices. This position offers a competitive compensation package and operates in an office-led environment.

Qualifications

• 3-7 years' experience in security engineering or infrastructure security.
• Strong programming or scripting ability, especially in Python.
• Experience with collaborative development practices is a plus.

Responsibilities

• Design and develop internal security tooling and automation.
• Collaborate with software and platform engineering teams.
• Investigate vulnerabilities and drive remediation efforts.
• Build scalable solutions to enhance security operations.

Skills

Security Engineering

Python programming

Automation

Communication skills

Technical generalist

Job description

[Up to c. £300k Comp Package (or equivalent) | Office-Led Working]

Role Overview

We’re partnering with a leading global trading and technology firm as it continues to expand its broader cybersecurity engineering capability across multiple international locations. This role is intentionally broad in scope, designed for strong software-oriented security engineers who may sit across offensive security, defensive engineering, infrastructure security, detection, tooling, or platform protection rather than one narrowly defined domain. The environment is highly engineering-led, with a strong preference for technically exceptional generalists who enjoy building, automating, and solving security problems through software and systems thinking. Successful candidates will typically come from a computer science or software engineering background before moving deeper into cybersecurity-focused engineering work.

This is a hands‑on role within a collaborative, low‑ego team where security is embedded directly into the engineering culture. The focus is less about rigid process ownership and more about bringing strong technical judgement, curiosity, and the ability to improve security through practical engineering solutions…

Key Responsibilities

• Design and develop internal security tooling, automation, and defensive capabilities across the technology environment
• Partner closely with software, infrastructure, and platform engineering teams to improve security across systems and workflows
• Contribute across a broad range of security initiatives, including detection, hardening, threat analysis, infrastructure protection, and secure engineering practices
• Investigate vulnerabilities, suspicious activity, and emerging threats, helping drive remediation and operational improvements
• Build scalable solutions that improve visibility, detection quality, and security operations efficiency
• Support security architecture and threat modelling discussions, helping teams make pragmatic, risk‑aware decisions
• Evaluate new attack techniques, tooling, and security research, translating relevant findings into actionable engineering improvements
• Help strengthen security awareness and engineering best practices across the wider organisation
• Continuously improve the balance between security, usability, and developer productivity

What You’ll Bring…

• 3-7 years’ experience in security engineering, infrastructure security, or a related technical field
• Strong computer science or software engineering foundations, with the ability to perform well in coding-focused interview processes
• Strong programming or scripting ability (Python or similar), particularly around automation, tooling, or systems development
• Experience building or contributing to security-focused software, tooling, platforms, or infrastructure
• Broad understanding of security concepts across areas such as application security, infrastructure security, detection, threat modelling, or defensive engineering
• Comfortable working as a technical generalist rather than within a highly siloed security function
• Ability to reason clearly about security trade‑offs and apply pragmatic engineering judgement
• Experience working with version control, modern engineering workflows, and collaborative development practices
• Strong communication skills and the ability to work effectively with highly technical stakeholders
• (Preferred) Backgrounds combining software engineering experience with subsequent security-focused engineering work