Senior Data Science Analyst – Advanced Recommendation Modeling & A/B Experimentation – Boston, MA – $24/hr – arenaflex

About arenaflex – Pioneering the Future of E‑Commerce Insight

arenaflex is a global leader in online retail, delivering millions of products to customers worldwide through a data‑driven, customer‑centric approach. Our mission is to turn massive, complex data sets into actionable intelligence that powers smarter product recommendations, improves shopper experiences, and drives sustainable growth. As part of our rapidly expanding Search & Recommendation Science team in Boston, you will work at the intersection of data engineering, machine learning, and product strategy, helping shape the next generation of personalized commerce.

Why This Role Matters

In today’s hyper‑competitive e‑commerce landscape, the ability to surface the right product at the right moment is a decisive advantage. As a Senior Data Science Analyst at arenaflex, you will be the analytical engine behind our recommendation algorithms, ensuring they are rigorously tested, continuously refined, and aligned with business goals. Your work will directly influence the shopping journey of millions of users, translating raw data into experiences that feel intuitive, relevant, and delightful.

Key Responsibilities

Data‑Driven Experimentation & Model Evaluation

• Design, implement, and monitor A/B experiments for new recommendation algorithms, ensuring statistical rigor and clear business impact.
• Develop and maintain robust KPI dashboards, including anomaly detection tools and high‑level estimation visualizations.
• Conduct exploratory data analysis (clustering, segmentation, trend discovery) to uncover hidden patterns that inform product strategy.
• Build and iterate on internal QA tools that simulate algorithm performance before live deployment, reducing risk and accelerating rollout.

Collaboration & Communication

• Partner closely with product managers, AI engineers, and data scientists to translate business problems into analytical solutions.
• Present findings and strategic recommendations to senior leaders across engineering, product, and marketing, using clear visualizations and storytelling techniques.
• Mentor junior analysts, fostering a culture of curiosity, rigor, and continuous learning within the team.

Innovation & Tool Development

• Prototype new analytical tools and frameworks that increase the efficiency of model testing and validation.
• Stay abreast of emerging machine‑learning techniques (e.g., gradient‑boosted trees, deep learning, reinforcement learning) and evaluate their applicability to recommendation problems.
• Drive the adoption of best practices in data hygiene, feature engineering, and model interpretability.

Essential Qualifications

• Education: Bachelor’s degree in Computer Science, Statistics, Mathematics, Engineering, or a related quantitative discipline. Advanced degrees are a plus.
• Technical Expertise: Deep, hands‑on experience with SQL (including complex joins, window functions, and performance tuning) and modern data warehouses such as Vertica, Hive, or Snowflake.
• Programming Proficiency: Advanced Python skills, including mastery of Jupyter notebooks, pandas, scikit‑learn, matplotlib, and related data‑science libraries.
• Experimentation Know‑How: Proven track record designing, executing, and interpreting A/B tests that drive product decisions.
• Machine‑Learning Foundations: Practical experience applying algorithms such as decision trees, random forests, and deep neural networks in a production environment.
• Communication Skills: Exceptional written and verbal abilities, with a collaborative mindset and the capacity to influence cross‑functional stakeholders.
• Problem‑Solving Drive: Demonstrated ownership of projects, ability to thrive in fast‑paced settings, and a passion for turning ambiguous data challenges into clear, actionable insights.

Preferred Qualifications & Additional Strengths

• Master’s or Ph.D. in a quantitative field, especially with a focus on recommender systems or large‑scale analytics.
• Experience with big‑data processing frameworks such as Spark or Hadoop.
• Familiarity with cloud platforms (AWS, GCP, Azure) and containerization technologies (Docker, Kubernetes).
• Knowledge of statistical programming languages like R or Julia.
• Prior work in e‑commerce, digital advertising, or consumer‑facing product recommendation domains.
• Demonstrated ability to translate complex technical concepts into business‑friendly narratives for executive audiences.

Core Skills & Competencies

• Analytical Rigor: Strong statistical foundation, hypothesis testing, and confidence interval interpretation.
• Data Engineering Acumen: Ability to extract, transform, and load (ETL) massive datasets efficiently.
• Product Insight: Understanding of how recommendation engines affect conversion, average order value, and customer retention.
• Collaboration: Proven teamwork with engineers, product owners, and designers to deliver end‑to‑end solutions.
• Adaptability: Comfort with evolving priorities, ambiguous requirements, and rapid iteration cycles.
• Ethical Awareness: Commitment to responsible AI practices, data privacy, and inclusive product experiences.

Career Growth & Learning Opportunities

arenaflex invests heavily in the professional development of its employees. In this role, you will have access to:

• Mentorship from senior data scientists and industry thought leaders.
• Sponsored attendance at conferences such as KDD, RecSys, and Strata Data.
• Internal workshops on advanced machine‑learning techniques, cloud architecture, and product analytics.
• Opportunities to lead cross‑functional projects that influence company‑wide strategy.
• A clear promotion pathway from Senior Analyst to Lead Data Scientist, Principal Engineer, or Product Analytics Manager.

Work Environment & Culture at arenaflex

Our Boston office blends the energy of a tech startup with the stability of an established global brand. Highlights include:

• Flexible Work Arrangements: Hybrid model with the option to work remotely up to three days per week.
• Inclusive Culture: A diverse workforce where every voice is valued; we actively support employees with disabilities through accessible workspaces and adaptive technologies.
• Collaborative Spaces: Open‑plan floors, quiet zones, and dedicated brainstorming rooms equipped with whiteboards and digital collaboration tools.
• Well‑Being Programs: On‑site fitness classes, mental‑health resources, and a generous PTO policy that encourages work‑life balance.
• Community Impact: Volunteer days, sustainability initiatives, and partnerships with local universities to foster talent pipelines.

Compensation, Perks & Benefits

arenaflex offers a competitive compensation package that reflects the expertise you bring to the team. While the base hourly rate is $24/hr, total rewards include:

• Performance‑based bonuses tied to project milestones and business outcomes.
• Comprehensive health, dental, and vision coverage for you and your dependents.
• Retirement savings plan with company matching contributions.
• Paid parental leave, adoption assistance, and flexible family‑friendly policies.
• Professional development stipend for courses, certifications, and conference travel.
• Employee stock purchase plan (ESPP) and equity grants for long‑term wealth building.
• Transportation benefits, including commuter subsidies and secure bike storage.

Commitment to Diversity, Equity & Inclusion

arenaflex is fully committed to providing equal employment opportunities to all individuals, including those with disabilities. We proactively share information about reasonable accommodations with qualified candidates, unless doing so would cause an undue hardship on the business. Our inclusive hiring practices ensure that talent from every background can thrive and contribute to our shared success.

How to Apply

If you are ready to leverage your analytical expertise to shape the future of recommendation technology at a world‑class e‑commerce leader, we want to hear from you. Click the link below to submit your application, resume, and a brief cover letter outlining your most relevant experience.

Apply Now

Join arenaflex – Where Data Meets Delight

At arenaflex, your insights become the engine that powers unforgettable shopping experiences. Join a team that values curiosity, rigor, and impact. Together, we’ll turn data into delight for millions of customers worldwide.