Senior Elixir Engineer

Employers from Greece; United States; Hybrid; USD 120,000 - 180,000; Full time

Benefits offered by this job

Relocation bonus

Tax relief on relocation

Accommodation during first weeks

Job summary

Hack The Box is seeking a Senior Elixir Engineer to own backend and full‑stack delivery on Phoenix and LiveView. You’ll design resilient OTP systems, robust APIs, and real‑time experiences that scale to millions of users.

You’ll mentor engineers, collaborate with product, design, and security researchers to translate complex detection workflows into intuitive interfaces, while shaping the technical roadmap in a remote‑first, Europe‑focused environment.

Qualifications

• 5+ years of backend or full-stack development.
• 3+ years shipping production Elixir/Phoenix.
• Strong grasp of OTP/BEAM concepts.

Responsibilities

• Design and build production Phoenix applications, REST APIs, LiveView UIs, and real-time features.
• Model data with Ecto and PostgreSQL, optimize queries and migrations.
• Build fault-tolerant systems using supervision trees and GenServer patterns.
• Own background jobs with Oban and ensure Observability with Telemetry.
• Deliver secure-by-default code and operate on Kubernetes/GCP environments.
• Mentor engineers, review code, and contribute to technical standards.

Skills

Elixir/Phoenix

LiveView

OTP/BEAM

Ecto/PostgreSQL

Distributed systems

Testing (ExUnit)

Mentoring

Tools

Oban

Docker

Kubernetes

GCP

Telemetry

Prometheus

Grafana

Sentry

Tailwind CSS

LiveView JS hooks

Job description

at Hack The Box

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.