Data Researcher – Full Time (hybrid – office/remote)

ThreatFabric

YOUR MISSION About the Job Title: Senior JavaScript Security Researcher Position: Full-time | 40 hours per week  Location: Amsterdam, Netherlands | Work From home (2-3 days per week in the office)  Salary Range: 80.000,- to 100.000,- annually  At ThreatFabric, we help the world's leading banks stay ahead of fraudsters, scammers, and cybercriminals. Our technology protects millions of users every day by detecting fraud, malware, and emerging attack techniques before damage is done. As a Senior JavaScript Security Researcher, you'll explore new browser capabilities, uncover detection methods, and turn cutting-edge research into real-world protection used at global scale. Your discoveries won't remain on a whiteboard, they'll directly help safeguard people and businesses around the world As a senior JavaScript Security Researcher, you’ll be responsible for maintaining our FRS web SDKs. Next to that you’ll be driving the new (detection) capabilities of our SDK. This includes detecting and investigating fraud patterns & trends. You’ll be working closely with Threat Analysts and Product teams to enhance fraud detection. Part of your job is exploring and experimenting with (new and upcoming) browser APIs, and research how these APIs can be used to create new and novel detections mechanism. This requires a creative and out-of-the-box mindset. Proven experience with browser and JavaScript security research is a plus.  The position  You should have the ability to research, develop, manage, test, and deploy browser-based JavaScript code in the following areas:  * Latest browser fingerprinting tactics * Ability to research the underlying working of browser APIs * Ability tocome up withnovel to use these APIs for detection; this includes looking for anomalies, side channels, and other side effects of these APIs * Creating a production ready web SDK Your daily work is to collaborate with the behaviour and device risk analytics tech team including backend engineers, data scientists and product managers.  You are expected to be able to work with minimal guidance as lead research and JavaScript engineer.   Since you will be working in a startup environment, passion and motivation are key to success and pleasure at work.  Responsibilities  Your key responsibilities will include:  * Maintaining our FRS web SDKs * Driving the new (detection) capabilities of our SDK * Detecting and investigating fraud patterns & trends * Working closely with Threat Analysts and Product teams to enhance fraud detection * Exploring and experimenting with (new and upcoming) browser APIs * Researching how these APIs can be used to create new and novel detections mechanism What We Offer * A 12-month employment contract with the intention to extend. Subject to mutual satisfaction, this may lead to a permanent position. * A competitive salary that reflects your skills and experience with a salary range between:80.000,- to 100.000,- annually. * 25 Holidays per year * 8% holiday allowance (included in annual salary). * A Pension Scheme. * A stimulating and supportive work environment that encourages growth and development. * The opportunity to make a meaningful impactina rapidly growing tech company. * Flexible Remote / Hybrid work from home options to promote work-life balance. * Flexible working hours. * ActiveThreatFabric events and FitFabric bootcamps.  * Active knowledge sharing huddles. YOUR PROFILE Skills and qualifications  * 8+ years relevant experience in JavaScript and or framework development.  * Familiar with Browser APIs including APIs needed for browser, mouse, keystroke, scroll dynamics.  * Able to work with Open Source development workflow using git.  * Excellent debugging and problem-solving skills.  * Knowledge of Docker is a nice to-have. * Proficient English writing skills to document work and communicate project status. * Be a team player and feel comfortable communicating and collaborating with other team members. Creativity and Innovation: * Generates and implements creative, innovative solutions to complex problems. Problem-Solving: * Communicates solutions clearly and concisely. * Possesses a scale-up mentality where flexibility and adaptability are key. Communication and Interpersonal Skills: * Communicates technical concepts effectively to diverse audiences. * Thrives in collaborative environments, fostering teamwork and cooperation. * Demonstrates empathy and understanding in interpersonal interactions. Continuous Improvement: * Actively seeks opportunities to enhance workplace practices and product quality. * Embraces a mindset of ongoing learning and development to stay ahead of industry trends. Information Security, Business Continuity & Privacy: * Proactively engages in maintaining information security and privacy standards. WHY US? About ThreatFabric At ThreatFabric, we're not just shaping the future of cybersecurity - we're defining it. With our headquartered in the vibrant city of Amsterdam, ThreatFabric stands at the forefront of combating online fraud, mobile malware, and threat intelligence.   Costly online scams, fraud and malware attacks are rampant. Victims’ life savings are stolen, but so are their confidence and trust. On top of this, financials' brand and reputation are damaged. Many lack online visibility to trigger prompt reaction, and the industry faces regulatory reimbursement pressure.   This is why ThreatFabric provides web and mobile security: scam, fraud and malware detection and prevention, and threat intelligence to be proactive. We help the biggest financial brands protect their customers and their reputation in a world where attacks escalate, and trust erodes.   Join Our Dynamic Team Ready to dive into the heart of innovation? Our team is a melting pot of talent, passion, and expertise from all corners of the globe. Behind ThreatFabric's success lies a diverse ensemble of technical experts, data scientists, and thought leaders united by a passion for innovation. With a global perspective and a collaborative spirit, our team leverages innovative technology and thousands of data points to deliver security solutions.   As a scale-up, we embrace a scale-up mentality where flexibility, adaptability, and a dynamic approach are essential.   Our Core Values At ThreatFabric, our culture is defined by three guiding principles: * One Team: Collaboration fuels our success as we work together to tackle complex challenges. * Continuous Excellence: We're committed to pushing boundaries and exceeding expectations in everything we do. * Customers at the Heart: Our customers are not just clients — they're partners. Their success is our priority. Interested? Are you as excited about this opportunity as we are? We can't wait to hear from you! Apply through the Personio link, and let's make innovation happen together! We aim to fill this vacancy in 2025.   What's next? So, you've hit send - what happens now? First, we'll do a screening to ensure we're a good match. If all goes well, you'll be invited for an initial chat with us. Then, there's a second interview, and we may include an assessment to better understand your skills. Ready to take the plunge?   Please note: Pre-employment screening is part of our selection proces, together with an technical assessment. We do not accept unsolicited resumes from recruiters or employment agencies.

Ultralytics

About Ultralytics: At Ultralytics, we commit to relentless innovation in the AI space and seek team members who resonate with our ambition to produce the world's best YOLO AI models. If you're obsessed with AI, eager to make an impact on the world, and thrive in dynamic, high-intensity environments, we invite you to apply for a position on our team. 🌎 Where and how you can work This full-time LLM Engineer position is based at our brand-new Ultralytics office in London, UK, with a hybrid model of three days in-office and two days remote. Applicants must have legal authorization to work in the UK, as Ultralytics does not provide visa sponsorship. 🚀 What you'll do As an LLM Engineer at Ultralytics, you will spearhead the development and integration of advanced language model capabilities across our ecosystem. You will work on cutting-edge projects that merge the power of large language models (LLMs) with our state-of-the-art computer vision technologies. Key responsibilities include: * Developing and scaling robust LLM-powered applications using a variety of APIs, including OpenAI, Anthropic, and Gemini. * Implementing and managing multi-API workflows using tools like LiteLLM to ensure flexibility and resilience. * Building sophisticated Retrieval-Augmented Generation (RAG) systems, leveraging advanced techniques like embeddings with Voyage AI, rerankers, and query enrichment. * Designing and maintaining efficient data pipelines and vector storage solutions using MongoDB Atlas Vector Search. * Fine-tuning LLMs on custom datasets to enhance performance for specialized tasks related to our documentation and user support. * Collaborating with our YOLO development team to explore and build innovative multimodal solutions. * Automating deployment and testing processes using CI/CD pipelines with GitHub Actions. Your work will directly enhance the Ultralytics Platform and empower our global community of developers and researchers. 🧠 Skills and experience * 5+ years of experience in software engineering, with a strong focus on AI and machine learning (ML). * Expert-level proficiency in Python and deep learning frameworks, particularly PyTorch. * Proven experience building and deploying applications with LLM APIs such as OpenAI, Anthropic, Gemini, and DeepSeek. * Hands-on experience with the full RAG pipeline, including vector embeddings, rerankers, and data indexing in databases like MongoDB. * Practical knowledge of LLM fine-tuning, prompt engineering, and performance optimization. * Familiarity with MLOps principles and tools, including CI/CD with GitHub Actions. * A strong interest in computer vision and an understanding of object detection models like Ultralytics YOLO26 is a significant plus. * Excellent problem-solving skills and the ability to perform in a fast-paced, high-intensity environment. 🌟 Cultural fit Ultralytics is a high-performance environment for world-class talent obsessed with achieving extraordinary results. We operate at a relentless pace, demanding exceptional dedication and an unwavering commitment to excellence, guided by our mission, vision, and values. Our team thrives on audacious goals and absolute ownership. This is not a conventional workplace. If your priority is predictable comfort or a standard work-life balance over the relentless pursuit of progress, Ultralytics is not for you. We seek driven individuals prepared for the profound personal investment required to make a defining contribution to the future of AI. 💰 Compensation and benefits * Competitive salary: Highly competitive based on experience. * Equity packages: Participate directly in our company's growth and success. * Hybrid flexibility: 3 days per week in our brand-new office — 2 days remote. * Generous time off: 24 days vacation, your birthday off, plus local holidays. * Flexible working hours: Tailor your working hours to suit your productivity. * Tech & tools: Engage with cutting-edge AI projects and contribute to leading open-source software. * Gear: Brand-new Apple MacBook Air/Pro, Apple Studio Display, and AirPods Pro 3. * Team: Become part of a supportive and passionate team environment. What we offer: Cutting-Edge, Next-Generation AI Computer Vision Technology: Contribute to building cutting-edge computer vision AI models based on the YOLO framework. Impactful Work: Shape the future of AI-powered solutions that transform industries. Collaborative Culture: Join a talented and passionate team that values open communication and innovation. Ultralytics Handbook Comprehensive guide to our company's mission, vision, values, and operational practices. This handbook is designed to provide key insights and resources for our (future) team members, collaborators, and community to align with Ultralytics' core principles. Link: https://handbook.ultralytics.com/ Ultralytics is an equal opportunity employer committed to building an inclusive workplace. We believe that everyone should be able to bring their whole selves to work, and we do not discriminate on the basis of race, religion, national origin, gender, sexual orientation, age, veteran status, disability, or any other legally protected status.

Prolific

SENIOR SOFTWARE ENGINEER  Engineering  Prolific Prolific is not just another player in the AI space – we are the architects of the human data infrastructure that's reshaping the landscape of AI development. In a world where foundational AI technologies are increasingly commoditized, it's the quality and diversity of human-generated data that truly differentiates products and models.   The role We’re looking for impact-focused Software Generalists to join our specialized team focused on serving frontier model creators and enterprise AI application developers. As a full-stack engineer, you will work across Prolific’s domains to solve customer and product problems. This is an exciting opportunity to work directly with frontier AI companies, making critical technical decisions that balance scrappy startup execution with scalable, reliable engineering, as Prolific revolutionizes research for the AI community. You'll will have regular in person collaboration with customers and our US team, as well as collaborate closely with our UK-based tech teams. This role is hybrid based out of our San Francisco office, approx 1-2 days a week.   What you’ll bring to the role * Over 4 years of experience in a product engineering role * Can translate business concepts into software models * Ability to quickly learn and adapt across the breadth of Prolific’s domains * Familiar working in both monoliths and distributed systems * Strong communication and collaboration skills for direct customer interaction * Good understanding of modern web applications and architecture design patterns * Experience supporting applications in production environments * Judgment to balance scrappy startup execution with scalable, reliable engineering * Comfort with rapid iteration and responding to customer queries with urgency * Experience with some of our technology stack: * Python (we use Django & Fast API) * TypeScript and JavaScript (we use Vue.js) * SQL and NoSQL databases (we use MongoDB and PostgresSQL) * Building and deploying to the cloud (we use GCP, Kubernetees, Github Actions & CircleCI) * Instrumenting, monitoring & observability (we use Datadog)     What you’ll be doing in the role  This is a unique engineering role at Prolific. In this role, you will operate with high ownership and a product mindset, at start-up pace, to solve customer problems and capture business opportunities irrespective of the technology required to do so. You will be part of a cross-functional Product Engineering team, optimised for the success of a single customer group. You will collaborate directly with account managers, customer success specialists and customers to deeply understand their problem spaces. You will ideate and build with autonomy, supported by a high-performing team. This role will see you work across Prolific domains to solve customer problems, needing you to get up to speed quickly and deliver across shared codebases to a high engineering standard. You will also help support our systems in production & respond to incidents when required.     Key Technologies  * Cloud Platforms: Google Cloud Platform and AWS * Programming Languages: Python, JavaScript, and TypeScript * Frameworks: Vue.js, Django Rest Framework, Container-based and Serverless architectures * Databases: MongoDB and DynamoDB * DevOps and Monitoring: CircleCI, GitHub Actions, Kubernetes, Celery, EventBridge and DataDog   Why Prolific is a great place to work We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioral data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems. We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviors into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breath and the best of humanity. Join us to enjoy a competitive salary, benefits, and remote working within our impactful, mission-driven culture. At Prolific, our compensation packages for eligible roles include base salary, equity, and benefits. Many roles also include the opportunity to earn a cash variable element, such as a bonus or commission. Each job posting shows a salary range that reflects the minimum and maximum target for new hires, based on the role’s location as well as your skills, experience, and relevant education or training. You can check the job posting’s subtitle to see where the position is based. Your recruiter will also be happy to share the specific salary range for your preferred location during the hiring process. For pay transparency, the base salary range for this full-time role in San Francisco is $250,000 - $300,000 per annum.   Links to more information on Prolific Benefits  External Handbook  Website  Youtube    Privacy Statement By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific use of your personal information.