Senior Search Backend Engineer

commercetools

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

Posted 9/15/2026full-timeValencia • SpainSeniorWebsite

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 ProgrammingElasticSearch DevelopmentKubernetes Infrastructure ManagementREST API DevelopmentMulti-Tenant SaaS Experience

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Search Functionality DesignParallel ProgrammingAsynchronous ProgrammingNon-Blocking I/OSearch Relevance MeasurementVector RetrievalHybrid RankingDocument RankingInfrastructure as CodePerformance Testing

Soft Skills

CollaborationCuriosityCommunication

Tools & Technologies

TerraformMongoDBHelmRustAI Tools

Industry Keywords

PaaSEcommerceScalable ArchitecturesEvent-Driven ArchitecturesInternational Team Collaboration

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, quality, and measurement
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 and use Scala and functional programming
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 and non-blocking I/O
Experience developing REST APIs
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
Knowledge of scalable event-driven architectures, including queues and notification topics
Genuine curiosity for using AI tools and applying them in the role
Hands-on search experience, preferably ElasticSearch or OpenSearch, including understanding of inverted-index scoring and document ranking
Practical exposure to vector retrieval, embeddings, approximate nearest-neighbor indexes, and hybrid ranking
Comfort reasoning about relevance using precision, recall, ranking metrics, and behavioral signals
Experience with infrastructure work and technologies such as Helm, Kubernetes, and Rust

Benefits

Comp & perks

Comprehensive health benefits for you and your dependents
Access to OpenUp for personalized mental health support
Annual learning budget
Access to self-paced learning platforms
Language training
Personalized coaching
Mentorship
Leadership programs
Additional fully paid weeks of parental leave through Family Leave Plus
Equity participation program