Senior Back-end Developer - Database

Link Group; Warszawa, Wrocław, Kraków; On-site; PLN 180,000 - 240,000; Full time

Job summary

Link Group is seeking a Senior Back-end Developer specializing in database technologies. You will lead design, development, and optimization of data-heavy backend systems, ensuring robust data modelling, efficient queries, and scalable storage strategies.

Collaboration with cross-functional teams will be essential to deliver high-performance data solutions. The role emphasizes independent, senior-level engineering work with strong focus on reliability, performance, and clear communication within

Qualifications

• Minimum 6 years of professional backend/database experience.
• Strong hands-on experience with MongoDB, PostgreSQL, Virtuoso Triple Store and OpenSearch.
• Experience designing, developing, optimizing and maintaining database solutions.
• Solid data modeling, querying, indexing and performance optimization skills.
• Ability to troubleshoot complex database issues and work independently in a senior role.
• Excellent communication and collaboration skills.

Responsibilities

• Design, implement and optimize scalable database solutions.
• Collaborate with engineering teams to integrate data stores.
• Troubleshoot and resolve database performance issues.
• Mentor junior colleagues and contribute to architectural decisions.

Skills

MongoDB

PostgreSQL

Virtuoso

OpenSearch

Data modelling

Querying

Indexing

Performance optimization

Troubleshooting

Independent work

Communication

Job description

Senior Back-end Developer – Database

We are looking for a Senior Back-end Developer with strong experience in database technologies and data-intensive backend environments.

Requirements:

• Minimum 6 years of professional experience working with backend/database technologies
• Strong hands-on experience with:
• MongoDB
• PostgreSQL
• Virtuoso Triple Store
• OpenSearch
• Experience designing, developing, optimizing and maintaining database solutions
• Strong understanding of data modelling, querying, indexing and performance optimization
• Experience troubleshooting complex database-related issues
• Ability to work independently in a senior-level engineering role
• Good communication and collaboration skills

Nice to have:

• Experience working with large-scale or distributed data environments
• Experience with cloud-based infrastructure
• Knowledge of CI/CD and modern software development practices
• Experience working in Agile teams