How to Hire an Elixir Developer in Singapore in 2026 — Salaries, Skills, and Finding Rare Talent

Mid-level Elixir developer

Can build a Phoenix app with Ecto, write ExUnit tests, implement a GenServer with proper state management. Understands pattern matching deeply and can write clear, idiomatic Elixir. Comfortable with Mix and understands umbrella projects conceptually.

Senior Elixir developer

Designs OTP supervision trees for production fault tolerance. Has shipped Phoenix LiveView features. Can explain process isolation and why it matters. Has diagnosed performance issues on the BEAM VM. Knows when NOT to use Elixir (CPU-bound numerical work, simple CRUD with no concurrency requirements).

Principal / Architect

Designs distributed Elixir systems with libcluster, handles network partition scenarios, has built Broadway pipelines for high-throughput data processing. Can make the architectural case for Elixir vs. alternatives and knows where Elixir's model breaks down. Has mentored teams transitioning from Ruby/Python/Node.js.

"Walk me through how you'd design a job queue system in Elixir without an external queue service."

What to listen for: Strong answer involves GenServer + ETS for state, a Supervisor for restarts, and persistence to PostgreSQL via Ecto for crash recovery. They should mention Oban as the production-ready solution and why they'd choose it over rolling their own.

"What happens to a GenServer process when it receives a message it doesn't have a handler for?"

What to listen for: The message stays in the mailbox and is ignored at that point — it doesn't crash the process. But if the mailbox grows unbounded, you get memory pressure. A strong candidate mentions :flush_mailbox, using handle_info for unexpected messages, and monitoring mailbox size in production.

"You have a Phoenix LiveView that connects 50,000 concurrent users. How do you handle state?"

What to listen for: Excellent answers mention PubSub for broadcasting updates, stateless LiveViews for scalability across nodes, the cost of holding too much state in a LiveView process, and ETS or Mnesia for shared read-heavy state. They'll mention horizontal scaling with libcluster.

"When would you NOT use Elixir for a project?"

What to listen for: This is a trust signal. Strong candidates say: CPU-bound numerical computation (use Python/C), simple CRUD with no concurrency story (Rails/Django is faster to build), ML model training (Nx is maturing but not production-ready for heavy workloads), or small teams with no Elixir experience who need to ship in 2 weeks.