Senior Python Developer – API & Data Connectivity (Freelance)

Keyrus is an international consulting firm, specializing in the integration of data intelligence and Digital solutions. With over 3,500 employees spread across 27 countries, Keyrus continues to deliver on such projects to a wide range of clients from various industries including but not limited to Banking / Finance, Healthcare / pharmaceuticals, FMCG, Oil & Gas, and more.

As part of Keyrus’ solution delivery, we are also in a position to recruit and place technical consultants to complement on existing client projects with their expertise. As such, we seek innovative and agile people to support ambitious and forthcoming technological challenges.

About the Role

We are looking for a Senior Python Engineer specialised in building API and streaming data connectors for data-intensive environments. You will be responsible for integrating market and alternative data sources, normalising the data, and storing it efficiently for downstream analytics and backtesting.

This role is hands-on and delivery-focused : you will build connectors end-to-end, from discovery to production-ready ingestion.

Key Responsibilities

Develop and maintain Python-based API / WebSocket connectors

Integrate both market data and alternative datasets

Handle historical backfill + real-time / streaming ingestion

Persist data to S3 / Parquet / ArcticDB (or similar columnar stores)

Ensure data quality, availability, schema consistency and metadata tracking

Work with internal quant / data consumers to align on requirements

Required Experience

6+ years experience in Python backend / API development

Strong experience with REST / WebSocket streaming integrations

Exposure to AWS (S3, IAM, Lambda / EC2) or similar cloud

Knowledge of columnar storage (Parquet, ArcticDB, Delta Lake, etc.)

Experience in data-intensive systems (finance / trading is a plus)

Comfortable working autonomously in a remote delivery model

Nice-to-Have

Asyncio / concurrent data ingestion

Prefect / Airflow / orchestration tools

Experience with financial or alt-data vendors (bonus)

Docker + CI / CD familiarity

Soft Skills

Delivery-driven, ownership mindset

Able to work with evolving requirements

Strong communication in English (async collaboration)