Senior Elixir Engineer - Remote & Real-Time Platform Expert

Hack The Box

Polska

Remote

PLN 392,000 - 654,000

Full time

8 days ago
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Benefits offered by this job

25 annual leave days
Parental leave
Home Office Allowance
Training and conference budget
State-of-the-art equipment
Access to Hack The Box lab offerings
Flexible working hours

Job summary

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

You’ll collaborate with product, design, and security researchers, mentoring engineers and shaping our technical roadmap in a remote-first environment across Europe, with relocation support to Athens if desired.

Qualifications

  • 5+ years of backend or full-stack development, with 3+ years shipping production Elixir/Phoenix.
  • Strong grasp of OTP and BEAM — processes, supervision, GenServer/GenStage.
  • Hands-on experience with Phoenix LiveView (components, streams, JS hooks).
  • Deep Ecto and PostgreSQL knowledge: schema design, query optimization, migrations.
  • Experience with background jobs (Oban) 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.
  • Security-minded engineering: OWASP fundamentals, auth patterns, secure data handling.
  • Excellent written & verbal communication in remote/async environments.

Responsibilities

  • Design and build production Phoenix applications — REST APIs, LiveView UIs, and real-time features on PubSub/Channels.
  • Model and evolve data with Ecto and PostgreSQL, writing performant queries and migrations.
  • Build fault-tolerant systems with OTP: supervision trees and distributed BEAM patterns.
  • Own background processing with Oban and observability via Telemetry.
  • Ship secure-by-default code with proper auth patterns and least-privilege access.
  • Deploy and operate services on Kubernetes/GCP with CI/CD pipelines.
  • Mentor engineers and contribute to technical leadership through code reviews and standards.
  • Document decisions and communicate clearly in a remote-first environment.

Skills

Backend development
Elixir / Phoenix
OTP BEAM
Phoenix LiveView
Ecto & PostgreSQL
Oban
Testing with ExUnit
Docker & Kubernetes
CI/CD
Security awareness
Remote collaboration

Tools

Elixir
Erlang
Phoenix
PostgreSQL
Oban
Tailwind CSS
Telemetry
Prometheus
Grafana
Sentry
Docker
Kubernetes
GCP

Job description

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

You’ll collaborate with product, design, and security researchers, mentoring engineers and shaping our technical roadmap in a remote-first environment across Europe, with relocation support to Athens if desired.

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