Senior Search Backend Engineer

commercetools

. Design and implement search functionalities in a PaaS ecommerce Scala backend .

Posted 9/15/2026full-timeMunich • GermanySeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and implementing search functionalities within a PaaS ecommerce environment, utilizing Scala and ElasticSearch. Proficient in developing scalable architectures and maintaining search infrastructure as code, with a strong focus on performance and relevance metrics.

Highest-signal resume keywords

Scala DevelopmentElasticSearchKubernetesREST API DevelopmentMulti-Tenant SaaS Experience

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Hard Skills

Search Functionality DesignParallel ProgrammingAsynchronous ProgrammingNon-Blocking I/OEvent-Driven ArchitectureVector RetrievalDocument RankingPerformance TestingInfrastructure as CodeFunctional Programming

Soft Skills

CollaborationCuriosityCommunication

Tools & Technologies

TerraformMongoDBHelmRustAI Tools

Industry Keywords

PaaSEcommerceSearch RelevanceScalable ArchitectureLoad Balancing

Tech Stack

Tools & technologies

ElasticSearchKubernetesMongoDBRustScalaTerraform

About the role

Key responsibilities & impact

Design and implement search functionalities in a PaaS ecommerce Scala backend
Develop search capabilities combining lexical, semantic, and hybrid retrieval
Develop search-related libraries based on ElasticSearch and MongoDB
Contribute to search relevance and quality and define how it is measured
Run and maintain scalable search infrastructure as code on Kubernetes using Terraform and multi-tenant architecture
Test software components for usability, functionality, and performance
Work closely with Product Management and DevOps
Learn Scala and functional programming as primary development tools
Participate in an on-call rotation with a worldwide distributed team for production systems

Requirements

What you’ll need

At least 5 years of experience as a Software Engineer, with production experience on the JVM
Solid understanding of parallel and asynchronous programming, as well as non-blocking I/O
Experience developing REST APIs and knowledge of scalable architectures, including sharding, replication, load balancing, and failover
Interest in working with Scala using pragmatic functional programming patterns
Fluent English for work in international teams
Experience operating multi-tenant SaaS where one tenant’s load must never affect another’s
Knowledge of scalable event-driven architectures, including queues and notification topics
Genuine curiosity for using AI tools to work smarter and more effectively, with a drive to learn and apply them
Hands-on search experience, preferably ElasticSearch or OpenSearch, including understanding of inverted-index scoring and document ranking
Practical exposure to vector retrieval, including embeddings, approximate nearest-neighbor indexes, and hybrid ranking
Comfort reasoning about relevance with data, including precision/recall tradeoffs, ranking metrics, and behavioral signals
Experience with infrastructure technologies such as Helm, Kubernetes, and Rust

Benefits

Comp & perks

Comprehensive health benefits for you and your dependents, including access to OpenUp for personalized mental health support
Learning and development opportunities including an annual learning budget, access to self-paced learning platforms and language training, personalized coaching, mentorship, and leadership programs
Family Leave Plus with additional fully paid weeks of parental leave on top of government-provided leave
Equity participation program
Hybrid work arrangement