Join the Elasticsearch Security team to design and implement core security features (authentication, authorization, tenant isolation), optimize security performance in distributed systems, apply cryptographic solutions, and work on vulnerability management while collaborating across engineering and product teams. Role emphasizes Java/JVM expertise, concurrency, and experience with identity protocols (OAuth 2.0, SAML).

Role to design, build, and operate core components of Serverless Elasticsearch, addressing distributed systems challenges such as cluster coordination, concurrent indexing, shard/node scale, and performance. Requires deep expertise in Java, distributed systems, consensus algorithms, and debugging large-scale multi-node features.

Join the Elasticsearch Core/Infra team to design and implement scalable core infrastructure and APIs, improve developer productivity and observability, investigate and resolve performance and stability issues, and contribute to CI/CD, serverless, cloud and on-prem delivery. The role requires strong Java skills, low-level JVM knowledge, concurrency expertise, and experience with observability and CI/CD practices.

Lead engineering work on Zyte's Edge platform: develop and maintain a cross-platform Rust peer runtime (Windows, Android, Linux, macOS) integrating with native network stacks via FFI (NDK/JNI, C++/Cronet, Win32/POSIX). Responsibilities include porting to mobile, implementing robust networking (TCP/TLS/HTTP, gRPC/mTLS), fleet metrics and observability, operational on-call duties, and collaborating with Browser and Antiban teams. Requires 5+ years production Rust experience and cross-platform/mobile Rust shipping experience.

Invicti is hiring a Senior Full-Stack Software Engineer to own features end-to-end across Vue 3 (TypeScript) front end, GraphQL APIs, and C#/.NET back-end services. The role emphasizes collaboration with Product and UX, accessibility and performance, AI-assisted development and review, testing and CI/CD, and working from the company's offices in Wrocław or Kraków, Poland.

Work on the Cast Pilot team building AI assistants for Kubernetes and a public, permission-aware MCP server. Responsibilities include designing agent flows, context retrieval, cloud connectivity across AWS/GCP/Azure, and writing production Go services interacting with cloud APIs, the Kubernetes control plane, and LLM APIs. Candidates must reside in the listed European countries; Cast AI does not provide visa sponsorship.

Work on the Cast Pilot team to design and build AI assistants and a permission-aware MCP server, develop cloud connectivity across AWS/GCP/Azure, and write production Go services interacting with Kubernetes and LLM APIs. The role requires strong software engineering fundamentals, production experience with large-scale SaaS and Kubernetes, hands-on agentic/AI agent workflows, and observability/CI-CD practices. This location-specific role accepts applicants residing in a list of European countries and the company does not provide visa sponsorship.

Join Cast AI's Cast Pilot team to design and build AI agent flows, a public permission-aware MCP server, and cross-cloud connectivity. Work involves production Go services interfacing with cloud provider APIs, Kubernetes control planes, and LLMs; owning features end-to-end and participating in on-call. Salary range advertised: €6,500–€9,000 gross. No visa sponsorship.

NVIDIA is hiring software engineering interns to expand Device eXtension (Dx) APIs for GPU-accelerated math libraries. Interns will prototype and develop numerical algorithms, analyze and optimize GPU implementations, define APIs, and prototype tooling to make math libraries LLM-friendly. Candidates should be pursuing an MS or PhD in CS/AI/Applied Math or related field and have strong C++ skills, experience with CUDA or other parallel/GPU programming models (OpenMP, OpenCL, SYCL), and familiarity with linear algebra, FFTs or data compression algorithms. Compensation ranges were provided for France and Poland in the posting.

Join Cast AI's Product Foundations teams to design, build, and operate backend services in Go that handle authentication/authorization, billing, real-time cloud pricing, audit trails, and reporting. Role is location-specific (several European countries listed), remote-first with required travel to Vilnius for onboarding. Salary range advertised: €6,500–€9,000 gross per month. Cast AI does not provide visa sponsorship.

Cast AI is hiring a Senior Software Engineer to design, build, and operate backend services in Go for trust- and accounting-critical systems (authentication/authorization/SSO, billing, cloud pricing, time-series reporting). The role requires strong systems and API design skills, Kubernetes experience, production-grade performance tuning, participation in on-call rotation, and strong English. Candidates must reside in one of the listed European countries; the company does not provide visa sponsorship.

The role focuses on designing, building, and operating CI/CD pipelines, observability/monitoring tooling, and local development tooling used across Cast AI engineering teams. Strong Go or comparable systems programming experience, Kubernetes, Terraform, CI/CD/GitOps, cloud platform experience (AWS/GCP/Azure), debugging and performance tuning skills are required. Position is remote-first for candidates residing in specified European countries, includes on-call participation, and requires travel to Vilnius for onboarding. No visa sponsorship is provided. Salary range listed: €6,500–€9,000 gross (monthly).

Join Cast AI's Platform team to design, build, and operate CI/CD/GitOps pipelines, observability and monitoring tooling, and local development environments. Role expects strong software engineering fundamentals, production experience with Go (preferred) or comparable systems languages, hands-on experience with Kubernetes, Terraform, cloud platforms (AWS/GCP/Azure), and familiarity with observability stacks. Remote-first role for candidates residing in specified European countries; travel to Vilnius for onboarding is required. Cast AI does not provide visa sponsorship.

Work on distributed systems that automate Kubernetes infrastructure (node placement, autoscaling, live workload moves, storage scaling, GPU optimization) in production. Requires strong software engineering, production Go or comparable systems programming experience, knowledge of Kubernetes internals, observability tooling, CI/CD/DevOps practices, and strong English. Hiring is limited to candidates residing in specified European countries; no visa sponsorship is provided.

Work on distributed systems that autonomously operate Kubernetes infrastructure at scale: node placement, autoscaling, live workload moves, storage autoscaling, and GPU optimization across clouds. Responsibilities include designing and shipping production Go services, integrating with AWS/GCP/Azure, debugging multi-cloud production issues, and owning features end-to-end. Requirements include strong software engineering fundamentals, Kubernetes internals knowledge, production Go experience (preferred) or comparable systems programming skills, experience with observability and CI/CD, and strong English. Cast AI does not provide visa sponsorship.

Elastic is hiring a Senior Software Engineer for its Control Plane (Hosted Foundations/Applications) team in Poland. The role involves technical design and leadership, implementing and debugging features, collaborating across distributed teams, and contributing to a reliable, scalable SaaS control plane. Requires 5+ years' software engineering experience and knowledge of backend languages (Scala, Java, or Go) and technologies relevant to SaaS (orchestration, networking, containers). Annual base salary range is 359,400–419,400 PLN.

Lead and execute competitive benchmarking initiatives for search, vector and hybrid retrieval, analytics, and observability workloads. Build automated benchmark harnesses, datasets, query sets and load profiles; design fair comparisons; measure latency, throughput, resource use and cost; investigate differences with profiling and controlled experiments; and publish reproducible artifacts and technical reports. Collaborate with engineering and product teams to translate findings into improvements.

Join GitLab’s Change Record team to build backend services and APIs in Ruby on Rails and GraphQL that record what changed in source code, why, and who/what made the change. Responsibilities include developing secure, well-tested, performant features, maintaining reliability (performance tuning, caching, rate limiting, observability), participating in Tier 2 on-call, troubleshooting incidents, and collaborating across product, design, security, and other engineering teams. Remote role for UK or Poland; Poland base salary range provided (248,000 PLN – 372,000 PLN per year).

Hybrid engineering and security position on the xStocks team at Payward/Kraken. Responsibilities include coordinating and reviewing smart-contract audits, pentesting web apps/APIs/on‑chain components, threat-modeling, reviewing code changes for auth/crypto/custody, hardening secrets/IAM/dependency hygiene, securing custody and signing workflows (MPC/HSM), and contributing TypeScript engineering work. Requires applied cryptography and blockchain security knowledge (EVM, Solana, ideally TON/Tron), strong offensive security experience, and the ability to drive security items to closure.

Own the end-to-end routing model: features, objective, training, calibration, evaluation, and rollout (shadow, A/B, full). Work with production fleet data, benchmark harnesses, and platform engineers to instrument per-request signals (including decode speed) and ensure production-parity with rigorous evals and error bars. Tech stack highlights: Python, PyTorch, SQL at scale (ClickHouse), OpenAI/Anthropic-compatible LLM APIs, and GitLab CI.