The Wikimedia Foundation seeks a remote Software Engineer to design, build, and operate backend systems and APIs for the Wikidata Query Service and related platform services. The role emphasizes production-grade service development, reliability, observability, CI/CD and incident response; requires 2+ years of relevant backend or platform engineering experience and timezone overlap with UTC+1 to UTC-5.

The Wikimedia Foundation seeks a Senior Software Engineer to design, build, and maintain backend systems and APIs for the Wikidata Platform, improve reliability and observability of WDQS and data pipelines, and participate in operational incident response and migrations. Requires 5+ years working on backend or platform engineering for distributed systems or data platforms and proficiency with systems languages (e.g., Java, C++). The role is fully remote with required working-hour overlap across UTC+1 to UTC-5.

WhiteTech is hiring a Software Architect with 8+ years of backend development experience and strong commercial PHP/Symfony skills. The role involves defining architecture and standards, designing high-availability distributed systems, guiding integrations with banking and compliance systems, reducing technical debt, and mentoring senior engineering staff. Remote-first within Europe (CET timezone) and several named European countries are explicitly welcomed.

Work on REDAPL to build a query engine supporting efficient relationship traversals and improve data ingestion, processing, and query pipelines. Lead and drive high-priority platform projects, contribute to architecture and reliability, and collaborate with product teams. Requires BS/MS/PhD or equivalent experience, several years in platform/infrastructure or backend engineering, and experience building/operating distributed systems. Bonus experience: graph databases (e.g., Neo4j, JanusGraph, ArangoDB, Amazon Neptune), Apache Iceberg, and production query-engine or query-planning work.

Remote-first senior PHP developer role contributing to backend and API development for a fintech white-label/SAAS platform. Responsibilities include designing, developing, testing, documenting and supporting software, integrating third-party payment systems, implementing DDD/CQRS/Event Sourcing patterns, optimizing SQL and system performance, and setting up integration/test environments. Role accepts applicants across Europe (including EEA, UK, Switzerland and listed non-EEA countries) and others who can work within the CET time zone.

WhiteTech is hiring a remote PHP developer to design, develop, test, document and support backend systems and APIs for fintech products. The role emphasizes Domain-Driven Design, Symfony, Doctrine, PostgreSQL, CQRS and Event Sourcing, containerization (Docker, Kubernetes), integration testing (PHPUnit, Codeception, Behat) and architectural design for large-scale microservices-based systems. Candidates across Europe (including specified non-EEA countries) or those able to work within CET are welcome.

WhiteTech seeks a remote PHP Developer with 4+ years of commercial PHP experience and hands-on SEON integration. The role focuses on building fraud detection/prevention flows, risk scoring and decision logic, orchestration within complex systems, and integrating SEON beyond simple API calls. Required skills include REST APIs/webhooks, asynchronous processing, queues, transactional consistency, idempotency, observability, SQL, and experience with Symfony or another modern PHP framework. Candidates across Europe (including listed non-EEA countries) and those able to work within CET are welcome to apply.

Lead backend developer role focused on PHP/Symfony development, RESTful API design, database design and optimization (PostgreSQL), integration of third-party payment systems, automated and integration testing, and architecture for scalable microservices and event-sourced systems. Remote-first position with flexible hours within the Central European Time zone; applications welcomed from Europe (including UK, Switzerland, and listed non-EEA European countries).

DuckDuckGo is hiring a Senior Backend Engineer to work remotely across multiple countries. The role requires 7+ years of backend experience (Perl, Go, Node.js), familiarity with AI agent tooling (RAG, prompt engineering, evaluation frameworks), and building/maintaining data processing pipelines and search-relevancy features. Responsibilities include owning complex projects, mentoring engineers, and collaborating across teams. Compensation listed at $178,500 USD/year plus stock options. Candidates should expect ~40 hours/week, occasional travel (~2x/year for all-hands and retreats), and a background check; company-sponsored health benefits are limited to US-based team members.