Senior Python Developer – API & Data Connectivity (Freelance)

About the Company: Keyrus

As an international player in consulting and technology, Keyrus is committed to making sense of data by revealing its full potential, particularly from a human perspective.

Our value proposition is built on diverse service groups:

• Automation & Artificial Intelligence: We provide our clients with the tools to enhance productivity and accuracy across their processes, allowing them to focus on higher-value work.
• Human-Centered Digital Experience: Customer relationships and employee engagement are two of the biggest contributors to business success. We help companies design and create seamless, multimodal digital experiences to achieve their goals.
• Data & Analytics Implementation: Data is an undeniable key to business success. When leveraged intelligently, it unlocks unique opportunities to tackle present and future challenges.
• Cloud & Security: Cloud computing and digital platforms have the potential to revolutionize how data is transformed into value, taking scalability and flexibility to the next level. We ensure that all your data remains protected and confidential.
• Transformation & Innovation: To thrive in today’s ecosystem, businesses must not only accelerate their digital transformation but also develop the skills necessary to enhance adaptability, resilience, and competitiveness. We help our clients successfully transform to build a better future.

With over 3,000 employees and a presence in 28 countries across 4 continents, Keyrus is a leading international expert in data, consulting, and technology.

Primary Description

Location: Keyrus · Ho Chi Minh City, Vietnam (Remote)

Description: 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 existing client projects with their expertise. As such, we seek innovative and agile people to support ambitious technological challenges.

About the Role

We are looking for a Senior Python Engineer specialized in building API and streaming data connectors for data-intensive environments. You will be responsible for integrating market and alternative data sources, normalizing 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)

Location: Ho Chi Minh City, Vietnam

Skills: