Senior Python Engineer

Hack The Box (HTB) is the leading cyber readiness platform for the agentic era, battle-testing and upskilling both humans and AI agents to enhance organizational cyber resilience. Trusted by the Fortune 500, government agencies, and MSSPs, the platform delivers threat-informed learning paths consisting of real-world scenarios in gamified labs and live-fire simulations that build and validate offensive and defensive cyber capabilities. With a loyal community of more than 4 million members and 800+ enterprise customers, Hack The Box empowers teams and intelligent systems alike to strengthen cyber defenses and reduce breach risk effectively.

Delivering continuous learning alongside industry-recognized certifications and certificate programs aligned with major workforce frameworks such as ENISA ECSF and NIST NICE, Hack The Box demonstrates external validation through recognized accreditation and role-based qualification recognition, including its ANAB-accredited HTB Defense Operations Analyst (DOA) certificate program and HTB CPTS, accepted for FedRAMP 3PAO penetration tester personnel.

Rapidly growing its international footprint and reach, Hack The Box is headquartered in the UK, with additional offices in the US, Australia, and Greece.

• 5+ years of professional software engineering experience, with a strong focus on backend systems and production ownership
• Strong proficiency in Python with hands-on experience building services using FastAPI
• Proven experience designing and operating backend systems, including REST APIs, PostgreSQL, Elasticsearch, and event-driven architectures (Kafka or similar)
• Deep understanding of backend architecture, scalability, and distributed systems, with the ability to design systems end-to-end
• Production experience with CI/CD and cloud-native infrastructure, including Kubernetes and Terraform

Bonus points:

• Experience with Django and FastAPI
• Experience with ClickHouse
• Familiarity with MCP and Fastmcp
• Exposure to AI and related technologies
• Experience in high-growth or startup environments

• Design, develop, maintain, and evolve backend services, including ownership of existing systems and delivery of new features
• Lead greenfield projects, designing and building backend systems from scratch with scalability and reliability in mind
• Own backend architecture and technical design, making informed decisions to support long-term growth and stability
• Develop and maintain REST APIs using modern frameworks like Django, FastAPI, or similar, and manage data storage and retrieval across multiple systems
• Collaborate closely with Product Managers to translate product requirements into well-designed technical solutions, and act as the go-to person for platform integrations
• Implement and maintain CI/CD pipelines, participate in system monitoring, performance tuning, production support, and contribute to internal documentation and knowledge sharing

At Hack The Box, we are committed to fostering a diverse, inclusive, and equitable workplace. We ensure that all job applications are considered solely based on merit, skills, and qualifications. We do not discriminate on grounds of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.