Freelance Backend Developer | Cryptocurrency Market Data API

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Contract Type: Freelance / Project-Based

Location: Remote

Project Description
We are looking for an experienced Freelance Backend Developer to design and build a scalable, high-performance API platform for historical cryptocurrency market data.

The developer will be responsible for building a backend system that enables customers to securely access, download, and replay large volumes of historical market data.

Main Responsibilities

• Design and develop REST APIs for historical market data access and downloads.
  Implement WebSocket streaming for historical market data replay.
  Integrate S3-compatible object storage and efficiently process Parquet datasets.
  Implement customer authentication, API key management, and access controls.
  Develop rate limiting, usage tracking, and data transfer quotas.
  Optimize performance for large datasets, high-throughput delivery, and concurrent users.
  Build a modular architecture that supports adding new exchanges, markets, and data products.
  Write automated tests, technical documentation, and deployment instructions.
• Required Skills

Strong backend development experience with Python, Go, or another suitable language.
Experience designing and developing REST APIs and WebSocket services.
Understanding of asynchronous programming, concurrency, and performance optimization.
Experience with S3-compatible object storage and large datasets.
Familiarity with Parquet data formats and efficient data processing.
Knowledge of PostgreSQL, Docker, and backend security.
Ability to independently design, implement, test, and document backend systems.

How to Apply
Interested candidates should send their resume (CV) .

Please include:

Your resume (CV) and GitHub profile or relevant backend projects.
Your availability to start.

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