Jan Kallay

Led a 7-person data engineering team, directing architecture decisions and delivery of data products. Defined system design and implementation standards for data pipelines and ML workflows. Managed end-to-end delivery of key data initiatives, including task breakdown and execution coordination. Utilized Jira for project workflows, overseeing sprint planning and backlog management. Built and maintained reliable production data pipelines for large-scale electronics sales datasets. Developed ML forecasting models for price estimation and market trend analysis using Python. Implemented LLM-based workflows for taxonomy unification across diverse data sources. Designed unified data models, enabling consistent analytics across fragmented datasets.

Built data pipelines and feature engineering workflows using Snowflake and Snowpark for processing automotive datasets. Developed machine learning models for predicting used-car prices in European marketplaces. Designed ETL pipelines in Keboola to consolidate heterogeneous vehicle listing data. Automated extraction and normalization of unstructured listing data, significantly reducing manual verification efforts. Implemented LLM-assisted workflows for standardizing inconsistent vehicle feature taxonomies. Aligned disparate marketplace schemas into a unified taxonomy, enhancing dataset consistency for pricing models. Collaborated with product and data teams to incorporate predictive pricing outputs into a web-based platform. Explored LLM-based techniques to enrich structured attributes from free-text vehicle descriptions.

Supported infrastructure engineering team in managing large-scale internal datacenter environments focused on networking and service infrastructure. Assisted with deployment, configuration, and maintenance of Linux-based systems across infrastructure. Utilized Docker and Kubernetes for containerized service deployment and workflow testing. Contributed to infrastructure automation using Ansible for efficient configuration management. Gained exposure to infrastructure-as-code practices through Terraform training and exercises. Developed Bash and Python scripts to automate operational tasks, improving system administration efficiency. Participated in troubleshooting production infrastructure, resolving DNS and connectivity issues. Supported internal tooling and API-based full search AI LLM systems to enhance developer productivity.

Established structured QA automation practices after transitioning from manual testing environments. Developed Python-based automation tools for test data generation and validation scripts. Collaborated with C# development teams to enhance software stability and reduce production defects. Created small internal tooling applications to aid developers in complex debugging tasks. Implemented automated testing methodologies, improving regression test coverage and reliability. Tested CAD-related engineering software, concentrating on BOM generation and workflow automation tools. Introduced effective communication strategies with developers to validate outputs efficiently. Led efforts in developing testing strategies that improved overall software quality.

Automated EU regulatory business travel reporting processes through development of Python-based scripts. Eliminated manual processing errors by automating workflows from HR Excel inputs to government labor office web forms. Implemented sophisticated browser automation to extract, validate, and submit structured data to regulatory portals. Developed tools for generating and archiving compliance receipts, facilitating audits and reports. Collaborated closely with consulting teams and clients to align automated solutions with regulatory requirements.

Advanced from financial analysis into a business and data analytics position supporting cross-functional teams. Refined large-scale Excel workflows using Python scripts, boosting processing efficiency and reliability. Developed reconciliation scripts addressing complex financial datasets with dynamic pricing elements. Shortened manual report generation time from six hours to thirty minutes by implementing automation strategies. Constructed unified data structures for analysts, streamlining Power BI dashboard creation and reporting processes. Produced Power BI dashboards tracking critical business and financial KPIs to expedite decision-making. Worked closely with stakeholders to align business requirements with structured data outputs. Standardized reconciliation logic across diverse datasets, enhancing data integrity and minimizing errors.

Utilized Python libraries such as Pandas and NumPy for data manipulation and analysis. Leveraged advanced Excel skills for complex data modeling and analysis. Implemented Power Query for efficient data transformation processes. Developed interactive dashboards using Power BI to visualize key metrics. Executed SQL queries for data retrieval and management across various databases.

Oversaw comprehensive accounting function, ensuring precise financial records and regulatory compliance. Supervised essential financial operations including bookkeeping, payments, invoicing, and month-end closing activities. Developed detailed financial reports to enhance management's strategic decision-making capabilities. Acted as primary finance liaison for external auditors, banks, and stakeholders. Maintained operational efficiency and transparency of financial data in nonprofit context.

Elevated from junior accountant to senior accountant based on proven reliability and performance in finance. Directed all aspects of accounts payable and receivable, ensuring efficient invoice processing and payment tracking. Guaranteed accuracy of financial documentation through consistent reconciliations and effective discrepancy handling. Worked alongside internal teams and external vendors to manage billing disputes and optimize cash flow. Facilitated monthly closing procedures, aiding in improved accuracy and timeliness of financial reports.

Managed multi-area hospitality services, encompassing bar operations, guest assistance, and cleaning coordination for international cruise lines. Served as informal language bridge between English-speaking management and Spanish-speaking crew, ensuring precise execution of instructions. Responded swiftly to communication needs within a multilingual workforce, maintaining workflow during peak times. Recognized for reliability and communication skills, leading to promotion as shift coordinator. Coordinated shift-level operations by distributing tasks among service and cleaning teams to sustain high service standards.