Freelance Data Engineer

Altamira is a software development outsourcing company. We provide solutions that make a tangible impact on our client’s growth and productivity. With domain knowledge across product and technology development, we aim to provide cost-efficient solutions without compromising quality. We are driven to deliver the best, every single time. 

Altamira service delivery teams currently span Slovakia, Ukraine, and the Middle East, and we have ambitions to expand our footprint to meet the growing demand across Europe and into our primary growth markets in the UK and the US. In terms of industry verticals, we are focused on EdTech, Fintech, eCommerce, and Pharma.

We’re looking for a freelance Data Engineer to join our project — a BI solution for organizing and selling industry‑specific data through interactive dashboards built with Apache Superset. The project focuses on extracting, modeling, and visualizing multi‑gigabyte datasets (1–4GB+) for end‑user analytics and decision‑making.

Responsibilities

• Design, build, and maintain interactive dashboards and charts in Apache Superset.

• Configure data connectors, caching, and performance tuning for large data volumes.

• Create and optimize complex SQL queries (PostgreSQL, MySQL, or similar) for multi‑GB data sources.

• Implement parameterized queries and templated filters to support self‑service analytics.

• Collaborate closely with data engineers to ensure seamless data ingestion and best practices for incremental loads, partitioning, and indexing.

• Partner with stakeholders and sales representatives to translate business questions into actionable data requirements and elegant visualizations.

• Monitor dashboard usage and query performance, proactively identify bottlenecks, and troubleshoot data quality or visualization issues.

Requirements

• 2+ years of hands‑on experience building dashboards in Apache Superset (or comparable BI tools like Tableau or Looker).

• Strong expertise in writing and optimizing complex SQL queries.

• Ability to work with large‑volume raw data (1–4GB+) and design efficient data models.

• Analytical mindset, adept at interpreting ambiguous requirements and proposing effective visual or technical solutions.

• Exposure to or a strong interest in the Pharmaceutical industry is a significant plus.

 Our transparent recruitment journey usually takes up to 2 weeks and includes a few stages:

1. Recruiting Interview -> 30-45 min
2. Technical Interview -> 1-1,5h
3. Client Interview (optional) -> up to 1h
4. Pre-Offer Call -> 15min
5. Reference Check
6. Offer

We offer:

• Competitive salary, room for development and growth;
• Possibility to work in the Bratislava and Kyiv office or fully remotely;
• Loyal management, interesting tasks, constant support;
• Medical insurance (optional);
• English courses;
• Technical equipment providing;
• Paid vacations 20 workdays, paid sick leave, regular salary reviews;
• Flexible schedule and ability to manage your working hours;
• Support your personal growth and skills upgrading;
• The great environment inside the team, support of initiatives, and ability to contribute to the common goal.

We do believe that the success of altamira.ai is impossible without the success of our Talents and the success of our Clients!