Senior Data Engineer

Ciklum is looking for a Senior Data Engineer to join our team full-time in Bulgaria.

We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.

About the role:

As a Senior Data Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. Together, we will work on the project to build and operate a serverless data platform powering analytics on AWS. Our cutting-edge environment focuses on scalable pipelines, Iceberg-based lakehouse architecture, and modern serverless processing models.

Responsibilities:

• Design and build high-performance data pipelines, including Python AWS Lambda functions, Step Functions workflows, and Spark jobs to process events and batch workloads
• Own the data lake by modeling, evolving, and optimizing Apache Iceberg tables backed by S3 and Glue
• Query and serve data with Trino and Athena, manage SQL templates using Jinja2, and ensure reliable execution
• Ensure performance and reliability using PyArrow for fast in-memory operations
• Provision AWS resources using Terraform and maintain strong Infrastructure as Code practices
• Ship well tested code with pytest and moto, ensuring high quality and reliability
• Collaborate with analytics, product, and infrastructure teams to prioritize work, design schemas, and uphold data contracts

Requirements:

• Deep Python expertise in building production data services and libraries
• Hands-on experience with PySpark, PyIceberg, PyArrow, GraphFrames, Lambda, Step Functions, S3, Glue, IAM, and serverless or event-driven patterns
• Knowledge of data lakehouse architecture, Iceberg table design, partitioning, schema evolution, compaction, and cost or performance tuning
• Experience with distributed processing using PySpark on EMR or similar frameworks, with understanding of shuffles, joins, and optimization
• Strong SQL proficiency across Trino or Athena, with ability to template queries and maintain standards
• Practical skills in Terraform workflows, container build pipelines, and EMR image customization
• Testing mindset including unit and integration testing, AWS mocking, and CI automation
• Comfort using AI-powered developer tools such as Cursor

What`s in it for you?

• Regular salary reviews based on performance
• Corporate events including webinars, offline parties, and meetups
• Internal Mobility Program
• Tailored education path including full access to Udemy and company-paid certifications
• 25 paid days off including 20 business days of vacation per calendar year plus 5 undocumented sick leave days
• Additional health insurance
• 100% company-covered Multisport card with family discounts available

About us:

At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress. Since expanding to Bulgaria in 2022, we’ve been building a fast-growing team that thrives on learning, collaboration, and innovation. Join us on this exciting journey and help shape the future of our delivery center.

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Explore, empower, engineer with Ciklum!

Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum.