ETL / Integration Developer REST APIs, SQL, Python, ETL Warsaw

Diverse CG Sp. z o.o. Sp.k.; Warszawa; On-site; PLN 90,000 - 120,000; Full time

Benefits offered by this job

Private medical care

Co‑financing for the sports card

Constant support of dedicated consultant

Job summary

Diverse CG Sp. z o.o. Sp.k. in Warsaw is seeking an ETL / Integration Developer to design and maintain ETL workflows. The candidate will work with IBM DataStage and Apache Airflow, integrating banking applications using APIs.

Minimum 5 years of experience in data engineering is required, along with strong SQL skills and proficiency in Python. The role also offers private medical care and financial support for sports activities.

Qualifications

• Minimum 5 years of experience in data engineering or ETL development.
• Strong understanding of API and integration concepts.
• Fluency in English (written and spoken).

Responsibilities

• Design, develop, and maintain ETL workflows using IBM DataStage and Apache Airflow.
• Integrate banking applications and third-party systems using APIs.
• Ensure data quality and compliance with banking standards.

Skills

Data engineering

ETL development

API integration

Advanced SQL

Python scripting

REST APIs

Analytical skills

Communication skills

Tools

IBM DataStage

Apache Airflow

Pandas

Job description

As a recruitment company, DCG understands that every business is powered by experienced professionals. Our management style and partnership approach enable us to meet your needs and provide continuous support. Due to our ongoing growth and the large number of recruitment projects we undertake for our partners, we are currently looking for:

ETL / Integration Developer

Responsibilities:

• Design, develop, and maintain ETL workflows using IBM DataStage and Apache Airflow
• Integrate banking applications and third‑party systems using APIs
• Work closely with architecture, business, and application teams to understand banking data flows and integration requirements
• Develop and maintain data processing scripts using SQL and Python
• Handle API responses, authentication, error management, and integration‑related issues
• Support testing, deployment, and monitoring of ETL and integration solutions
• Ensure data quality, security, and compliance with banking standards and regulatory requirements
• Troubleshoot data flow issues and support continuous improvement of existing integration processes

Requirements:

• Minimum 5 years of experience in data engineering, ETL development, data integration, or a similar role
• Strong understanding of API and integration concepts
• Hands‑on experience with REST APIs
• Knowledge of API authentication methods, API response handling, and error management
• Advanced SQL skills
• Experience with Python scripting, including data‑related libraries such as Pandas
• Good understanding of ETL processes and data integration principles
• Ability to work closely with technical and business stakeholders
• Strong analytical and problem‑solving skills
• Good communication skills and ability to work in a collaborative environment
• Fluency in English (both written and spoken)

Nice to have:

• Experience with Apache Airflow
• Experience in ETL design, development, testing, and deployment
• Basic to intermediate Unix/Linux shell scripting knowledge
• Good understanding of Data Warehouse concepts
• Knowledge of dimensional modelling
• Experience working in a banking or financial services environment

Offer:

• Private medical care
• Co‑financing for the sports card
• Constant support of dedicated consultant