Build and evolve the agent harness used to run LLM-based agents on CAST AI's inference infrastructure. Responsibilities include designing and shipping harness features (hooks, permission gates, context compaction), owning long-horizon multi-session execution, architecting planner/executor/evaluator pipelines, managing agent memory and state persistence, and owning the harness surface (CLI/TUI/MCP/telemetry). Tech stack includes TypeScript, Go, Kubernetes, cloud providers (AWS/GCP/Azure), Prometheus/Grafana/Loki, GitLab CI, and ArgoCD. Role is remote-first and open to candidates residing in specific European countries listed in the posting.

Sardine seeks a Senior Data Scientist (7+ years) to measure, understand, and improve risk strategies for fraud and AML. Responsibilities include prototyping and deploying ML models and graph analytics, conducting EDA and cohort analyses, defining and tracking performance metrics, creating self-serve dashboards (Tableau/Sigma/Metabase), and collaborating with engineering and product teams to scale models into production. Role is remote-first with candidates in UK, Germany, Ireland, Spain, Poland, Bulgaria, and Lithuania eligible.

Director, User Insights at DuckDuckGo (remote) to set strategic direction and lead researchers across product areas. Requires 15+ years experience (including 4+ years in senior leadership), deep practitioner-level command of quantitative and qualitative methods, experience with consumer-facing tech and frequent A/B experiments, and willingness to use AI workflows. Compensation listed at $243,800 USD/year; periodic travel (~2x/year) required.

Cast AI seeks a Senior Product Designer to design and scale a data-heavy SaaS platform. The role requires end-to-end design experience (user research, wireframes, prototypes, visual design, usability testing), technical awareness (APIs, collaboration with developers), and experience with AI-assisted design workflows. Candidates must reside in one of the listed European countries. Salary range provided: €4000–€6500 gross.

The Payroll Specialist Lead - Poland owns end-to-end payroll execution and compliance for Poland, coordinates with internal and external stakeholders, resolves payroll discrepancies and risks, and contributes to process scalability, automation and AI adoption across Remote’s global payroll operations. Role is remote and prioritizes applicants in Poland.

Responsible for executing compliant payroll across EMEA, launching new countries and products, scaling a high-performance payroll team, developing repeatable SOPs, resolving issues with authorities and partners, and partnering with Product and Engineering. Role requires minimum 7 years in global payroll and at least 3 years managing payroll operations (experience managing teams of 8+). Remote-first, based in supported European countries with regional travel as needed.

The role leads roadmap, requirements, and delivery for the prop trading terminal and trading UX, partnering with engineers, risk, and Kraken Pro. Requires 3+ years in senior product management with deep derivatives trading knowledge (perps, futures, margin), experience building for professional traders, technical fluency with APIs and real-time systems, and strong written product specification skills.

CloudLinux seeks a Senior Product Engineer (remote) to own a product domain or platform component. Requires 8+ years software engineering experience, strong Linux and CI/CD skills, extensive use of LLM/AI tools in development, and responsibilities including coding, CI/CD maintenance, incident support, observability, prototyping, and product/operational leadership.

Manager role responsible for the architecture and roadmap of Kraken's real-time streaming and data platform (Spark, Kafka, Iceberg, RisingWave, Flink), building scalable data systems for trading, risk, compliance and analytics. Requires 8+ years in data/platform/distributed systems (with 3+ years managing teams), experience with AWS data services, production streaming/CDC pipelines, programming in Python/Scala/Java, and adoption of AI automation in data workflows.

Remote senior platform role responsible for building and operating a multi-tenant Kubernetes-native cloud (Cluster API, vCluster, KubeVirt), operating Ceph/Rook-Ceph storage, managing networking (BGP, EVPN/VXLAN, IPSec/WireGuard, JunOS), applying SRE practices, and automating infrastructure with Terraform/OpenTofu and Ansible. Requires 5+ years infrastructure/platform experience and at least 3 years operating production Kubernetes platforms.

This remote, full-time Mobility Specialist role focuses on immigration compliance and global mobility: providing legal and strategic guidance, preparing and submitting visa and work permit applications, managing cases, and improving processes through automation. The role prioritizes candidates in EMEA and requires fluent English and experience in immigration or global mobility.

Join the MediaWiki Platform team to design, improve, and maintain core MediaWiki components and shared platform capabilities (authentication, caching, rate limiting). The role emphasizes backend engineering, system design, observability, CI/CD, incident response, performance, scalability, and mentoring in a fully remote, distributed team.

EXANTE seeks a Scala Developer with 5+ years of Scala experience to support and evolve a large microservices codebase, develop external connection points (HTTP and FIX APIs), and optimize infrastructure for maintainability and performance. Required skills include Scala (2.x/3.x), Akka, Cats Effect or ZIO, JVM multithreading, SQL and NoSQL databases (PostgreSQL, MySQL, Redis, MongoDB, Cassandra), and experience working in distributed product teams. English fluency is required.

NVIDIA is hiring a Senior Software Engineer to design and implement JAX core components and drive performance on NVIDIA hardware. Responsibilities include collaborating with applied researchers, building developer tools, and bridging numerical computing and deep learning research to products. Requirements include a BS or equivalent, 6+ years relevant experience, strong C/C++ and Python programming, knowledge of ML frameworks (e.g., PyTorch, TensorFlow), familiarity with CPU/GPU architectures and numeric libraries, and strong system/software design and communication skills. Poland-specific base salary ranges are provided in the posting.

Join the pre-sales Solutions Engineering team to run technical discovery with prospects, design tailored solutions across Payward's product suite, build proof-of-concepts to win deals, and execute structured handoffs to implementation. Requires 4+ years in technical pre-sales at a B2B API or infrastructure company and strong experience with APIs (REST/WebSocket), auth patterns (OAuth, JWT), webhooks, integrations, and fintech/crypto integrations.

Ashby is hiring a Product Support Engineer (EMEA) to diagnose and resolve technical issues related to integrations, APIs, and product functionality. The role includes troubleshooting, log and code analysis, creating documentation and enablement materials, and working closely with Engineering to escalate and resolve complex issues. Locations listed include multiple European countries.

Join Cast AI's infrastructure teams to design, build, and operate backend services, Kubernetes operators/controllers, and cloud provisioning across AWS, GCP, and Azure. Work areas include cluster/node lifecycle, cross-cloud provisioning, live container migration (CRIU), kernel-level Linux engineering, and storage/CSI drivers. Role requires strong backend fundamentals (preferably Go), hands-on Kubernetes or cloud infrastructure experience, and clear English communication. Salary range listed in the posting: €6,500–€9,000 gross.

Cast AI is hiring Senior Software Engineers to build distributed systems that operate Kubernetes infrastructure autonomously at scale. Teams include Workload Optimization, Karpenter, Reporting, Pricing, Autoscaler, Identity, and Billy. Role expects production Go experience (preferred), strong cloud (AWS/GCP/Azure) and Kubernetes internals knowledge, observability and CI/CD experience. Salary range listed: €6,500–€9,000 gross. No visa sponsorship provided.

Responsible for the motion and interaction layer of the Kraken mobile app (React Native). Work includes building and evolving animated components and motion tokens, profiling and optimising rendering performance (especially on lower-end Android), bridging to native when needed, and partnering with product designers to ship refined motion and interaction experiences.

Planner 5D seeks an Android Team Lead with 7+ years of Android experience to own Android development, make technical decisions, mentor developers, and implement complex features (graphics, multiplayer, AI, CRDT). Required skills include Kotlin, Java, Jetpack, Dagger, Coroutines/RxJava, Room/SQLite, REST/Protobuf, testing, and in-app payments. Locations listed include several European cities and Poland.