Senior Backend & Data Engineer - JavaScript/TypeScript

Senior Backend & Data Engineer

Location: Hybrid - Warsaw (2 days remote / 3 days office)

About Consid Consid is an award-winning IT company founded in Sweden, with a strong presence across Norway, Denmark, Germany, Finland, and Poland. We combine Scandinavian work culture with technical excellence, delivering modern, scalable digital solutions for international clients. At Consid, we believe in collaboration, ownership, and continuous growth. We build strong teams that create meaningful products - and we make sure our people grow along the way.

About the Role We are looking for an experienced Senior Backend & Data Engineer to join Technology Innovation Hub in Warsaw. This is a hybrid position combining backend software engineering with data engineering, with a particular focus on complex database solutions, data architecture, and Master Data Management (MDM). You will work hands-on with JavaScript and TypeScript, complex relational databases, and data-driven backend solutions, while taking technical ownership of a dedicated data domain.

Responsibilities

• Design, develop, and maintain scalable backend services and data-driven applications using JavaScript and TypeScript.
• Design and implement complex relational database structures, primarily using PostgreSQL or similar technologies.
• Take end-to-end technical ownership of a dedicated data domain, ensuring the reliability, consistency, and maintainability of its solutions.
• Develop and optimize data models, database schemas, queries, and backend data processing.
• Design and maintain backend solutions supporting complex data handling, transformation, and integration across systems.
• Apply Master Data Management (MDM) principles to ensure data consistency, integrity, quality, and reliability.
• Build and maintain integrations between backend services, databases, and other enterprise systems.
• Identify opportunities to improve data architecture, performance, scalability, and maintainability.
• Independently analyse technical challenges, propose solutions, and take responsibility for their implementation.
• Collaborate with international engineering teams, business stakeholders, and other technical specialists.

Requirements

• 8+ years of professional software engineering experience, with a strong background in backend development and data-intensive applications.
• Strong hands-on experience with JavaScript and TypeScript in backend environments.
• Advanced knowledge of relational databases, particularly PostgreSQL or comparable database technologies.
• Proven experience designing, implementing, and maintaining complex database schemas and data models.
• Solid understanding of database architecture, performance optimisation, data integrity, and data consistency.
• Experience building backend systems involving complex data processing, transformation, or integration.
• Understanding of Master Data Management (MDM) principles, including data quality, consistency, and management across systems.
• Experience designing and developing APIs and backend integrations.
• Ability to independently own technical solutions and make architectural and implementation decisions.
• Strong analytical thinking, problem-solving skills, and attention to data quality.
• Excellent communication skills and fluency in English.

Nice to Have

• Experience working in international or distributed engineering teams.
• Previous experience taking ownership of a specific business-critical data domain.
• Hands-on experience implementing MDM solutions or working with enterprise master data.
• Experience with Node.js frameworks such as NestJS or Express.
• Knowledge of data engineering practices, including data pipelines, ETL/ELT processes, or data transformation workflows.
• Experience integrating data across multiple enterprise systems.
• Understanding of data governance, data lineage, and data quality frameworks.
• Experience working with cloud-based infrastructure or data platforms (AWS, Azure, or GCP).
• Experience working in complex enterprise technology environments.

Recruitment Process

• Screening Call (30 min, on-line): A short introductory conversation with our recruitment team to discuss your background, motivation, and role expectations.
• Cultural Fit Interview (30 min, on-line): A conversation focused on your collaboration style, communication approach, and experience working with different stakeholders in an international environment.
• Onsite Interview: A technical test with the Tech Lead and Data Lead, followed by a behavioral and culture-fit interview with the Hiring Manager. We aim to complete both stages during one onsite visit.