Senior Python Backend Engineer

4 days ago

Greater Sydney Area, Australia Themelia Full time $120,000 - $180,000 per year

Senior Python Backend Engineer (Performance & Parallel Execution)

Company Description

Themelia is a crypto index and analytics platform entering a performance and scaling phase. We're seeking a senior Python engineer with expertise in computational optimisation and concurrent systems to improve index calculation performance and parallelise exchange trade execution paths. You'll optimise bottlenecks in Pandas/Polars pipelines, compile numeric workloads with Numba or Cython, and manage multi-exchange execution flows efficiently using async or multiprocessing patterns.

Responsibilities


• Profile and optimise CPU-intensive analytical functions using Numba, Cython, or Polars


• Parallelise and coordinate trade execution logic across multiple exchanges


• Maintain concurrency-safe integrations with exchange APIs (async I/O, multiprocessing, or queues)


• Refactor and benchmark Pandas-based data pipelines for speed and reliability


• Collaborate with the Postgresql engineer to streamline database-to-API data flow


• Log, monitor, and validate performance improvements in production

Requirements


• Advanced Python (5+ years) with focus on performance and concurrency


• Strong experience with Numba, Cython, or other compiled-code acceleration


• Proficiency in asyncio, concurrent.futures, or multiprocessing


• Solid understanding of Pandas internals and familiarity with Polars or DuckDB


• Comfort with Postgresql, SQLAlchemy, and structured logging


• Strong mathematical and analytical reasoning

Nice to Have


• Experience with crypto or traditional exchange APIs (REST/WebSocket)


• Familiarity with message queues (Redis, RabbitMQ, Kafka)


• Background in quantitative or financial data systems

Compensation

  • Equity-based.

How to Apply

Send a short note, your LinkedIn and GitHub profile to

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