NVIDIA is hiring a Senior Software Developer for an AI networking acceleration team to build a performance-oriented open-source inference framework using hardware offloads (GPU kernels, RDMA). Requires B.Sc. or equivalent and 6+ years of modern C++/C/Rust development, plus Linux experience and deep knowledge of TCP/IP, computer architecture and OS concepts. Locations listed include Czechia, Romania, Hungary and Poland (remote options). Poland base salary ranges are provided in the posting.

CloudLinux seeks an SDET/QA Automation Lead to transform a global remote QA team into an AI- and automation-first quality engineering function. Responsibilities include defining product quality metrics and multi-quarter QA roadmap, expanding and owning test infrastructure, improving test reliability, and mentoring SDETs. Tech stack includes Python, pytest, Playwright, Jenkins, GitLab CI, OpenNebula, S3/Ceph, Allure, Redash/ClickHouse, Slack, and Jira.

Tide is hiring a CRM Manager – Subscriptions (Romania) to plan and execute CRM strategies for subscription products. Responsibilities include segmentation, personalised communications, predictive modelling to reduce churn, cross-functional collaboration, and managing/mentoring a Senior CRM Executive. Requirements: 3+ years CRM experience (ideally in subscription businesses), experience with subscription billing systems, strong analytics and marketing automation skills, and excellent English. Salary range: EUR 30,500–34,200 annual gross.

Cast AI is hiring a Senior Software Engineer focused on database optimization to build greenfield systems for automated query analysis, index recommendations, and performance tuning. The role requires production experience with PostgreSQL and/or MySQL, strong Go and/or C++ skills, and English communication; candidates must reside in one of the listed European countries. Salary is advertised at €6,500–€9,000 gross.

Responsible for gathering CRM requirements, designing, coding, testing and troubleshooting Salesforce applications, maintaining documentation and application security. Requires advanced knowledge of Salesforce CRM platforms and a bachelor’s degree in computer science/software engineering or equivalent experience.

Kraken seeks a Staff Product Designer to set and elevate design vision across complex, high-priority areas of its flagship app. The role involves leading design for ambiguous problem spaces, evolving the design system, influencing product strategy, mentoring other designers, and using data and research to inform decisions. Requires 7+ years of product design experience with strong mobile UX, visual design, advanced prototyping, and systems thinking; experience in trading/financial products is a plus. Positions are listed for multiple countries.

Lead design and implementation of core backend services for a global payments platform, focusing on scalability, performance and developer experience. Python experience is advantageous; responsibilities include applying BDD/TDD, creating well-tested code, conducting code reviews, and producing internal documentation. Role is fully remote with required base in Poland, Portugal, Hungary, Romania or South Africa.

Hubstaff is hiring a Senior Product Engineer for its Growth team. The role is a remote, ~40 hrs/week independent contractor position focused on building and owning customer-facing features end-to-end using Ruby on Rails, PostgreSQL, and frontend technologies (Vue.js, Hotwire, Tailwind). Responsibilities include designing and running experiments (A/B tests), collaborating with Product, Design and Data, and shipping rapid iterations to improve acquisition, activation, engagement and retention. Hiring is listed for Argentina, Brazil, Canada, Poland, Romania, Spain and Portugal.

Kraken's Pro team seeks a Senior Software Engineer (Frontend) with 6+ years building web applications using JavaScript/TypeScript and React. Responsibilities include designing, developing, and maintaining React applications (Next.js, WebSockets), influencing technical decisions, mentoring engineers, and working on API design, security, and performance. Experience in payments, crypto, or fintech is preferred; strong English communication skills required.

Senior, hands-on Staff Product Engineer (Ruby on Rails). Remote role owning hard PRs and end-to-end product areas (billing, enterprise auth, API, dashboard, infra), responsible for performance, security, mentoring via code review, and shipping production Rails code. Fluent English and prior Stripe/billing experience required.

SearchApi seeks a senior infrastructure engineer to own and operate its cloud stack and observability for production workloads serving billions of requests. Responsibilities include architecting and operating containerized browser infrastructure, managing AWS services (ECS, EKS, Fargate, RDS, ElastiCache), writing Terraform, tuning autoscaling and networking (websockets, TCP), debugging production issues, and mentoring engineers. Role is remote and expects strong written English, deep AWS and infrastructure-as-code experience, and prior work at scale.

SearchApi seeks a remote Ruby Engineer to build and maintain web-scraping integrations and browser automation (CDP), tackle anti-bot evasion, optimize concurrency, and support production systems at scale. The role involves debugging production issues, reverse engineering protections, contributing across the stack (Ruby on Rails, PostgreSQL, Redis, Sidekiq), customer-facing support, and improving monitoring and infrastructure (Terraform, AWS, Prometheus, Grafana).

Remote role to design and implement greenfield proxy infrastructure: high-performance reverse proxies, IP rotation and session management, IP reputation tracking, geo-targeting and monitoring. Requires deep TCP/UDP and protocol knowledge (HTTP/HTTPS/SOCKS5, HTTP/2/3), Linux networking experience, prior experience building proxy or networking infrastructure, fluent English and a BSc or equivalent technical degree.

SearchApi seeks a remote Anti-Bot Engineer to research and implement anti-bot evasion, reverse engineer detection systems (Cloudflare, Akamai, DataDome, PerimeterX, etc.), optimize Playwright/Puppeteer/CDP configurations, debug TLS/protocol fingerprinting (JA3/JA4, HTTP/2, HTTP/3/QUIC), analyze network traffic, and run headless browsers reliably at scale. Fluent English and deep hands-on experience with browser internals, fingerprinting, network analysis tools, and relevant tooling (Playwright, Puppeteer, Selenium, Wireshark, Burp Suite, mitmproxy) are required.

Remote Senior Technical Support Engineer role supporting enterprise customers of a cybersecurity SaaS. Responsibilities include troubleshooting complex frontend/backend issues, working with engineering/product/security teams, debugging and building small automation tools, and mentoring other support engineers. Requires 5+ years in software engineering or technical support, proficiency in Python, JavaScript, HTML, CSS, and experience with distributed systems and web security.

Design and implement ML models that scale to millions of requests per second, translate business requirements into technical specifications, evaluate and debug models, and provide technical mentorship. Role combines research, engineering, and deployment work in a fully remote, flexible-hours environment. Requires 5+ years professional applied ML experience and experience with real-time, incremental, and online learning.

Intuition Machines seeks a Senior Cyber Security Analyst to monitor and investigate automated and human threats across the hCaptcha platform. Responsibilities include advanced investigations, threat hunting, incident response, auditing security measures, contributing to AI/ML detection improvements, and collaborating with product and customer teams. Required skills include web/API security, WAFs, SQL, Kubernetes, scripting (Python/JavaScript), and deep understanding of web application threat landscape. Role is fully remote with flexible hours and requires pre-employment screening and identity verification in the candidate's country of residence.

Lead and architect large-scale, production ML projects from design through deployment and maintenance. Require 7+ years building and maintaining production ML systems with focus on scalability, performance, reliability, and leadership. Familiarity with Kubernetes, containerization, distributed systems, and experience mentoring other ML engineers. Positions listed for Poland, Romania, Austria, and Croatia; role is fully remote with flexible hours.

The role leads the ML Security team responsible for bot, agent, and human fraud/abuse detection, owning execution of roadmaps, architectural and technical decisions, code reviews, mentoring, and delivery from data exploration through production deployment and monitoring. Required: strong ML/data science or engineering background with production ML experience, engineering management or tech lead experience, expertise in high-availability and distributed systems, Python, ML pipelines, MLOps, and strong cross-functional communication. Position is fully remote with flexible hours; all candidates will undergo pre-employment screening and identity verification in their country of residence.

Senior PostgreSQL Database Engineer (remote/EMEA and listed cities). Provide expert support to customers on complex PostgreSQL issues, perform investigations and live troubleshooting, contribute documentation and community content, and work with Kubernetes, Linux, cloud services (AWS/Azure/GCP), and related Postgres tooling. Role requires deep PostgreSQL expertise and fluent English.