Senior Data Scientist – Ranking Science & Machine Learning (Remote) – Lead AI‑Powered Job Matching Solutions at arenaflex

About arenaflex

arenaflex is the world’s leading online employment platform, connecting millions of job seekers with employers across the globe. Founded in the early 2000s, arenaflex has grown into a data‑driven powerhouse, leveraging a unique, massive dataset of job listings, resumes, applications, and hiring outcomes. Our mission is simple yet ambitious: to help people get jobs. We achieve this by creating an inclusive, supportive environment where every employee can bring their authentic self to work, innovate fearlessly, and deliver transformative, long‑term value to our users.

Why Join arenaflex?

At arenaflex, you’ll be part of a purpose‑filled organization that values curiosity, collaboration, and impact. Our Core AI team operates as a research and development hub, tackling “big picture” problems that shape the future of work. As a senior data scientist, you’ll have the autonomy to design, build, and scale cutting‑edge machine learning models that directly influence how millions of people discover opportunities every day. We invest heavily in your growth, offering mentorship, continuous learning resources, and a clear pathway to senior leadership roles.

Key Responsibilities

• Design, develop, and productionize machine learning models that power ranking and relevance for job search results, moving concepts from prototype to large‑scale deployment.
• Establish and enforce best practices for model evaluation, monitoring, and MLOps, ensuring reliability, fairness, and performance at scale.
• Collaborate cross‑functionally with product managers, engineers, data engineers, and analysts to translate business needs into robust AI solutions.
• Lead code reviews and champion engineering standards, fostering a culture of high‑quality, maintainable code across the team.
• Stay abreast of the latest research in open‑source AI, deep learning, and recommendation systems, and creatively adapt findings to solve real‑world challenges at arenaflex.
• Balance technical depth with product thinking, taking ownership of both model performance metrics and the overall user experience.
• Mentor junior data scientists and engineers, sharing expertise in model development, experimentation, and deployment pipelines.

Essential Qualifications

• Education: Bachelor’s degree in a quantitative discipline such as Computer Science, Mathematics, Statistics, Physics, Economics, or a related field.
• Experience: Minimum 2 years of professional experience as a Software Engineer, Data Scientist, or Machine Learning Engineer in a production environment.
• Modeling Expertise: Proven track record of training, fine‑tuning, and evaluating large‑scale machine learning models, particularly deep learning architectures.
• Technical Skills: Hands‑on experience with deep learning frameworks such as PyTorch, TensorFlow, or Hugging Face Transformers.
• Algorithmic Knowledge: Strong understanding of recommendation systems and ranking algorithms, with a focus on relevance and personalization.

Preferred Qualifications

• Advanced degree (M.S. or Ph.D.) in a related quantitative field.
• Experience building and scaling machine learning pipelines for billions of daily predictions.
• Familiarity with large‑scale data processing tools (e.g., Spark, Flink) and cloud platforms (AWS, GCP, Azure).
• Knowledge of Java or Scala for integrating models into production services.
• Demonstrated ability to publish research findings or contribute to open‑source projects.
• Experience with fairness, bias mitigation, and interpretability techniques in recommendation systems.

Core Skills & Competencies

• Analytical Thinking: Ability to break down complex problems, formulate hypotheses, and design experiments that yield actionable insights.
• Collaboration: Strong communication skills to work effectively with multidisciplinary teams and convey technical concepts to non‑technical stakeholders.
• Product Mindset: Understanding of how AI models translate into user‑facing features, with a focus on impact, usability, and business outcomes.
• Software Engineering Discipline: Proficiency in version control (Git), testing frameworks, and CI/CD pipelines.
• Continuous Learning: Passion for staying current with AI research, attending conferences, and sharing knowledge internally.

Career Growth & Learning Opportunities

arenaflex is committed to your professional development. As a senior data scientist, you will have access to:

• Dedicated budget for conferences, workshops, and certifications.
• Internal AI symposiums where you can present your work and learn from peers.
• Mentorship programs pairing you with senior leaders in product, engineering, and research.
• Opportunities to lead cross‑functional initiatives, influencing product strategy and roadmap.
• Potential pathways to roles such as Principal Scientist, AI Engineering Manager, or Director of Machine Learning.

Compensation & Benefits

We offer a competitive hourly rate of $30‑$40 per hour, reflective of experience, location, and performance. In addition to base pay, arenaflex provides a comprehensive Total Rewards package that may include:

• Quarterly performance bonuses.
• Equity participation through Restricted Stock Units (RSUs).
• Generous paid time off (PTO) and flexible holiday policies.
• Health, dental, and vision insurance for you and your dependents.
• Well‑being programs covering mental health, fitness, and nutrition.
• Family‑friendly benefits such as parental leave, childcare support, and pet‑care resources.
• Remote‑first work model with a flexible schedule that respects work‑life balance.

Our Inclusive Culture

arenaflex believes that diversity fuels innovation. Our inclusive culture is built on:

• Employee Resource Groups (ERGs): Communities for underrepresented groups to share experiences, network, and drive change.
• Belonging Initiatives: Programs that ensure every arenaflexian feels safe, respected, and empowered to contribute.
• Transparent Communication: Regular town halls, Q&A sessions with leadership, and open forums for feedback.
• Learning & Development: Access to internal learning platforms, mentorship circles, and skill‑building workshops.
• Social Impact: Volunteer days, community outreach, and partnerships with organizations that promote equitable access to employment.

How to Apply

If you are passionate about leveraging AI to transform the job search experience and thrive in a collaborative, fast‑moving environment, we want to hear from you. Join arenaflex and help shape the future of work for millions worldwide.

Apply Job!