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Location: London At Boom, we don’t hire mercenaries. We hire missionaries. Engineers who want to architect systems that power a global platform. We’re building something that redefines how people interact with money, outside of the banking system. That takes backend engineers who can scale, secure, and future-proof critical infrastructure. Responsibilities : • Design, build, and scale backend services with low latency, high throughput, and strong reliability., • Implement secure APIs, integrations, and data flows that connect mobile apps with blockchain components., • Collaborate closely with product owner, frontend, mobile, and blockchain engineers for seamless product delivery., • Champion performance optimization, monitoring, documentation 1and observability., • Lead code reviews, mentor teammates, and set engineering best practices., • Stay ahead of emerging backend architectures and distributed systems approaches. Requirements : • 5+ years of backend development experience (Node.js, Go, Java, or similar)., • Strong understanding of scalable system design, microservices, and cloud infra (AWS/GCP/Azure)., • Expertise in databases (SQL + NoSQL), caching, and data pipelines., • Familiarity with security, authentication, and encryption best practices., • Problem-solving mindset and ability to thrive in high-intensity, fast-moving environments. Nice to Have : • Experience with event-driven architectures and real-time data., • Exposure to blockchain integrations or Web3 APIs., • Background in fintech, marketplaces, or high-traffic consumer platforms. Extra Perks at Boom • Crescending Salary (First 90 Days): you prove impact, we ramp your pay up, faster than most companies promote., • Stock Options (Post 90 Days): real ownership. Not play money, but a meaningful equity stake in Boom’s future., • Missionary Bonus: milestone-based cash or digital asset rewards for those who go above-and-beyond expectations in the first year., • Founder Access: direct collaboration with founders/leadership, not layers of management., • Rapid Growth Path: prove yourself in 90 days and you won’t just work on tickets, you’ll lead initiatives., • Onsite Culture: daily face-to-face collaboration in London., • Wellbeing Support: private healthcare & wellness allowance (because missionaries need fuel, too)., • Time for Mastery: dedicated “Build Fridays” to experiment, refactor, or research new tech (mobile + blockchain)., • Immersive Offsites: team offsites (local & abroad) to reset, align, and celebrate wins together. Compensation & Rewards • Base Salary (London, senior-level):, • First 90 days: £5,500 → £7,500 → £9,500/month crescending structure., • Post-90 days: £95,000 – £130,000+ full base salary depending on performance and seniority., • Equity / Stock Options: meaningful ownership in Boom., • Missionary Bonus: milestone-based cash or digital asset rewards., • Healthcare & Wellness: private cover + allowance.

Cyber Armed Security are seeking a skilled Penetration Tester to join their Cyber Security team. In this role, you will be responsible for simulating real-world attacks against our clients’ systems, applications, and infrastructure to identify vulnerabilities and provide actionable remediation advice. You will play a critical role in strengthening security postures, protecting sensitive data, and helping organisations meet compliance and regulatory requirements, the candidate must be highly self-motivated and confident to work efficiently alone. Key Responsibilities · Conduct penetration testing across networks, web applications, APIs, mobile applications, and cloud environments. · Perform vulnerability assessments and exploit weaknesses in a controlled, ethical manner. · Develop and deliver detailed technical reports and clear executive summaries for clients. · Provide expert advice on remediation strategies and security best practices. · Stay up to date with the latest exploits, attack vectors, tools, and methodologies. · Support Red Team and Purple Team engagements where required. · Collaborate with internal security teams, developers, and client stakeholders to improve overall security posture. Essential Skills & Experience · Minimum of 2 years of proven experience as a Penetration Tester, Ethical Hacker, or in a similar cyber security role. · Manual testing ability · Strong knowledge of penetration testing methodologies (e.g. OWASP, NIST). · Proficiency with common testing tools (e.g. Burp Suite, Metasploit, Nmap, Nessus, Kali Linux). · Solid understanding of networks, operating systems, web technologies, and cloud platforms (AWS, Azure, GCP). · Ability to write and deliver clear, professional reports. · Relevant industry certifications (e.g. OSCP, CREST CRT, CEH, GIAC GPEN) highly desirable. Desirable Skills · Experience with scripting/programming languages (Python, PowerShell, Bash, etc.). · Exposure to Red Team operations and threat emulation. · Familiarity with security compliance standards (ISO 27001, PCI-DSS, Cyber Essentials Plus). · Strong client-facing skills and ability to explain technical findings in non-technical terms.