Looking for a job

Roman Maier

@romanmaier

Message

I build reliable distributed data platforms and planning pipelines with PySpark, Airflow, and Python.

Kazakhstan

Message

What I'm looking for

I'm looking to build reliable, maintainable distributed data platforms, solve complex business and data-processing problems, and collaborate closely with analysts and engineers while sharing engineering practices and domain knowledge.

At AXENIX, I build and evolve PySpark data processing solutions and Apache Airflow workflows for InPlan, an integrated business planning platform used by large manufacturing companies. I own core Product Scheduling pipelines and contribute to Supply Network Planning for an FMCG manufacturer with 11 production facilities.

I turn incomplete, evolving business requirements into maintainable planning logic by working closely with analysts and product owners. I also created a reusable PySpark testing framework that validates complex planning logic against analyst-defined datasets.

Previously at EPAM Systems, I developed large-scale data platforms for Syngenta, CBH Group, Edmunds, Enovos, and VTB Bank. My work has covered weather, soil, geospatial, agricultural, automotive, energy, banking, and cloud ETL workloads across AWS and Azure.

I've spent more than nine years solving distributed processing, data-quality, integration, and performance problems with Spark, Python, Scala, Java, and cloud data services. I value automated testing, code quality, knowledge sharing, and using LLMs to investigate architecture, legacy code, refactoring, and complex issues.

Experience

Work history, roles, and key accomplishments

Current

Senior Data Engineer

Current

AXENIX

Feb 2023 - Present (3 years 7 months)

Worked on InPlan, an Integrated Business Planning (IBP) platform supporting demand planning, supply chain planning, and production scheduling for large manufacturing companies.

Worked primarily on the Product Scheduling and Supply Network Planning modules, implemented and customized for a large FMCG manufacturer operating a distributed network of 11 production facilities.

• Developed and evolved

Python Apache Spark Airflow PostgreSQL PySpark Kubernetes

Data Engineer — Syngenta

EPAM Systems

Sep 2020 - Jun 2022 (1 year 9 months)

Client: Syngenta (Switzerland)

Worked on agricultural data platforms providing weather, soil, and vegetation data for digital farming solutions used by agronomists, agricultural producers, and internal consulting teams.

The platform enabled data-driven decision-making for crop selection, planting schedules, environmental risk assessment, and field management using large-scale weather and geospat

Apache Spark AWS Glue PySpark Amazon Redshift DynamoDB Jenkins

Data Engineer — CBH Group

EPAM Systems

Feb 2020 - Sep 2020 (7 months)

Client: CBH Group (Australia)

Worked on a hybrid Azure-based data platform for one of Australia's largest agricultural companies, developing and maintaining cloud-based ETL pipelines integrating on-premises systems with Azure services.

• Developed, enhanced, and maintained ETL pipelines using Azure Data Factory, Azure Databricks, Azure Blob Storage, Azure SQL, and on-premises data sources.

• De

Apache Spark Azure Databricks Python Scala Azure Data Factory Azure SQL azure monitor Log Analytics

Data Engineer — Edmunds

EPAM Systems

Nov 2018 - Jan 2020 (1 year 2 months)

Client: Edmunds (USA) — Online Automotive Marketplace
Worked on a large-scale distributed data platform supporting dealer analytics, lead attribution, sales matching, KPI calculation, and reporting for one of the leading U.S. automotive marketplaces.

The platform processed data from multiple external systems to help dealerships measure marketing effectiveness, match customer interactions with veh

Apache Spark Scala Oozie HBase Maven

Data Engineer — Enovos

EPAM Systems

Mar 2018 - Oct 2018 (7 months)

Client: Enovos (Luxembourg) — Energy Provider

Worked on a greenfield MVP data platform for Luxembourg's largest electricity and natural gas provider. The platform processed smart meter measurements, prepared and aggregated energy consumption data for forecasting and operational processes, and published results to downstream systems.

• Developed Apache Spark ETL pipelines implementing core busine

Apache Spark Scala Cassandra RabbitMQ Spring Boot Elasticsearch

Data Engineer — VTB Bank

EPAM Systems

Mar 2017 - Feb 2018 (11 months)

Client: VTB Bank

Contributed to the development of backend services for enterprise banking systems, implementing business logic and supporting in-memory data processing.

• Developed Java microservices using Spring Boot.

• Built a service layer over Apache Ignite for in-memory business data processing.

• Implemented unit and integration tests.

• Supported onboarding of new team members.

Java Spring Boot Apache Ignite PostgreSQL

Data Engineer — Apache Flink

EPAM Systems

Nov 2016 - Mar 2017 (4 months)

Apache Flink (Open Source Project)

Contributed to the Apache Flink open source project, investigating and resolving issues related to distributed data processing, deployment, and Kafka integration.

• Contributed bug fixes to the Apache Flink project.

• Investigated and resolved issues related to Kafka integration and Hadoop YARN deployment.

• Improved deployment stability and resource utilizat

Apache Flink Java Kafka