System Performance Engineer

2 weeks ago

Tel Aviv, Tel Aviv, Israel Flarion Full time ₪120,000 - ₪180,000 per year

At Flarion, we're building a new kind of big data accelerator targeting technologies like Apache Spark, Ray, and Hadoop. We combine low-level native implementations in Rust and C++ (leveraging Arrow, Polars, DataFusion) with intelligent query optimization that makes workloads run dramatically faster and cheaper.

We're looking for a
Principal Engineer to focus on performance optimizations for our in house distributed data systems
. It's a hands-on position where you'll profile, debug, and tune complex systems for speed and efficiency.

What You'll Do

  • Profile and optimize distributed systems at scale (Spark, Ray, Hadoop, or similar).
  • Dig into complex, multi-layer codebases and improve their runtime performance.
  • Work with Arrow/Polars/DataFusion internals to shape efficient execution paths.
  • Translate insights from profiling and benchmarks into production-ready improvements.
  • Own projects end-to-end: identify bottlenecks, design solutions, test, and ship them.

Must-haves

  • Proven track record of performance optimization in distributed systems or large-scale data platforms.
  • Hands-on coding experience with performance-critical systems in Languages such as Scala, Python, Rust, or C++.
  • Experience profiling, debugging, and tuning complex distributed codebases.
  • Ownership mindset: ability to take projects from problem definition to production.
  • Strong problem-solving skills and attention to detail.

Preferred

  • MSc or PhD in Computer Science, Electrical Engineering, or related fields.
  • Experience with Spark internals, Ray, Hadoop, or similar distributed compute frameworks.
  • OSS contributions to distributed systems, query engines, or performance-critical libraries (e.g., Spark, Presto/Trino, Arrow, DataFusion, Polars).
  • Familiarity with database internals, compilers, or query optimization is a plus, but
    not a core requirement
    .
  • Experience building or tuning high-performance systems in production.

Experience

  • 7+ years working in distributed systems, databases, or high-performance infrastructure.
  • Hands-on experience reducing latency, improving throughput, or lowering resource consumption in real-world systems.
  • Demonstrated ability to improve performance in multi-tenant, production-grade environments.

Values We Screen For

Excellence. Ownership. Collaboration. Self-Starter. Integrated Thinking. Ambition. Innovation.

Why Join

This role puts you at the heart of what makes Flarion different:
making large-scale distributed systems run faster, leaner, and more reliable.
You'll work with low-level engines, contribute to open-source, and deliver optimizations that have immediate impact on some of the largest data workloads in the world.

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