Senior Elixir Engineer — Remote

Ready to embark on the quest of joining Hack The Box?

Welcome Super excited you dropped by 🥳

At the end of this journey, you'll become a proud member of Hack The Box, with the ultimate mission to raise cyber resilience, so that every organization can stay ahead of tomorrow's threats.🚀🔒💻

✨The core mission of the Senior Elixir Engineer:

Join our fast-growing team building the platform that trains the world's cyber workforce. As a Senior Elixir Engineer, you'll own backend and full-stack feature delivery on Phoenix and LiveView — designing resilient OTP systems, clean APIs, and real-time user experiences that scale to millions of users.

Our culture prizes autonomy, technical craft, and the drive to ship secure software that outsmarts attackers.

🍺 The fellowship you'll be joining:

Reporting to the VP of Artificial Intelligence, you will be part of a 7 people team. You'll collaborate with product, design, and security researchers to turn complex detection and response workflows into intuitive, intelligence-driven user experiences—while mentoring engineers and shaping our technical roadmap.

🏢 Location & Work Mode:

• Europe/Greece
• Choose between fully remote work across Europe or relocating to our Athens Tech Hub with relocation support
  
  

Fully Remote / Hybrid (2 days in the office, 3 days remote, plus one month of work from anywhere) - If only in Greece: When hiring in Greece, we're open to candidates from all locations. Those based within 55 km of our Athens office will follow a hybrid work model. For candidates located beyond that radius, a fully remote arrangement is available.

✈️ Relocation

• We offer a 10% relocation bonus on the annual salary to support your move
• In addition, you would benefit from a 50% tax reduction on your income as part of the relocation
• We'll support you with accommodation during the first few weeks
  
  

⚔️ Technology tools & weapons you'll be using:

• Elixir / Erlang / OTP
• Phoenix, Phoenix LiveView, Phoenix PubSub
• Ecto & PostgreSQL
• Oban (background jobs)
• Tailwind CSS, LiveView JS hooks
• Telemetry, Prometheus, Grafana, Sentry
• Docker, Kubernetes, GCP
  
  

🚀 The adventures that await you after becoming Senior Elixir Engineer at Hack The Box:

• Design and build production Phoenix applications — REST APIs, LiveView UIs, and real-time features on PubSub and Channels
• Model and evolve data with Ecto and PostgreSQL, writing performant queries and safe, zero-downtime migrations
• Build fault-tolerant systems with OTP: supervision trees, GenServers, and distributed BEAM patterns where they earn their keep
• Own background processing and scheduled workloads with Oban, with proper observability via Telemetry and metrics
• Ship secure-by-default code: authentication/authorization patterns, least-privilege data access, and input hardening — this is a security company
• Deploy and operate services on Kubernetes/GCP, contributing to CI/CD pipelines and release quality
• Mentor engineers and contribute to technical leadership through code reviews, design sessions, and coding standards
• Document decisions and communicate clearly in a remote-first environment, contributing to a culture of thoughtful async collaboration
  
  

🏆 Skills, knowledge, and experience points required to unlock the role of Senior Elixir Engineer at Hack The Box:

• 5+ years of professional backend or full-stack development, with 3+ years shipping production Elixir/Phoenix
• Strong grasp of OTP and the BEAM — processes, supervision, GenServer/GenStage, and when not to reach for them
• Hands-on experience building interactive UIs with Phoenix LiveView (components, streams, JS hooks)
• Deep Ecto and PostgreSQL knowledge: schema design, query optimization, indexing, migrations
• Experience with background job systems (Oban preferred) and event-driven architectures
• Solid testing discipline with ExUnit; comfortable with property-based and integration testing
• Familiarity with containerized deployment (Docker, Kubernetes) and CI/CD best practices
• Security-minded engineering: OWASP fundamentals, auth patterns, secure handling of user data
• Excellent written & verbal communication, especially in remote/async environments, with a bias toward documenting architecture and decisions
  
  

🕹️ What your Hack The Box adventure will have in store:

• 🎯You'll have the exhilarating opportunity to contribute to a product that is highly appreciated by users and the cybersecurity community at large