Teams at Zefr

Design, build, and operate REST and GraphQL APIs, MCP servers, Apache Airflow workflows, and data transformation pipelines using Snowflake and dbt. Collaborate with an experienced applications engineering team supporting front-end interfaces and batch processes. Apply systems engineering and product lifecycle principles while contributing to reliable, scalable software solutions.

Manage client relationships for Zefr’s programmatic advertising product. Guide brands and agencies in executing campaigns, optimizing performance, meeting KPIs, and resolving technical or strategic challenges. Analyze client data, provide consultative advice, communicate customer needs to product teams, identify expansion opportunities, and deliver an excellent customer support experience.

Develop and maintain code-based automated tests for APIs, web applications, data pipelines, AI/ML services, and partner integrations. Plan feature testing, validate data and model outputs, integrate reliable test suites into CI/CD, monitor production quality, investigate incidents, and verify releases. Collaborate with engineering, product, data science, and customer-facing teams while improving test coverage, reliability, and performance.