Job Summary: Act as a technical leader in a multidisciplinary team, developing scalable solutions and driving discoveries for OLX’s search system. Key Highlights: 1. Technical leadership and end-to-end solution development. 2. Collaboration within a multidisciplinary team focused on innovation. 3. Autonomy and freedom to define work standards and routines. We are a fully digital company with technology developed locally and a market leader in online buying and selling. We have become the brand that best represents the circular economy in the country. Today, we operate from two offices in Rio de Janeiro and São Paulo. Our flexible work model offers autonomy and freedom, enabling our people to design their own standards and routines with discipline and proactive engagement with business goals, priorities, and company purpose. Building a diverse, inclusive, and equity-driven environment is part of our DNA. We believe diversity, equity, and inclusion are essential to creating a safe environment that delivers innovative and efficient outcomes for our people and society. **Responsibilities and Duties** If you want to be part of this challenge, this opportunity is for you. In this **Staff Senior Machine Learning Engineer** role, you will join the **Search Team**, whose mission is to evolve and maintain components associated with OLX’s search system. **Day-to-day responsibilities include:** * Serving as a technical leader within the team; * Identifying and executing enhancements and new requirements; * Developing end-to-end solutions for scalable applications with extremely high throughput; * Conducting discovery activities to understand business rules and design scalable solutions; * Collaborating within a multidisciplinary team. **Requirements and Qualifications** **What do you need?** * Proficiency in SQL and Python; * Experience in numerical analysis and modeling; * Knowledge of Machine Learning models, LTR (Learning to Rank), Ranking, and Recommendation systems; * Ability to conduct consistent and clear quantitative analyses—from problem framing through to results presentation; * Ability to document and communicate data-driven insights to colleagues across diverse backgrounds; * Collaborative mindset, with objective communication and openness to diverse perspectives; * Capability to write production-ready code at the prototype level without relying on software engineers. **Desirable / Differentiating Qualifications:** * Experience in Machine Learning research; * Experience in software development; * Experience in product creation and development. **Additional Information** **More about OLX Group:** Operating in Brazil since 2010, OLX Group’s purpose is to empower people to achieve their dreams by reinventing consumption models. Following its acquisition of ZAP Group, completed in October 2020, the company operates OLX—a leading horizontal platform in automotive, used consumer goods, and real estate categories—as well as two leading real estate platforms: ZAP and Viva Real. **Benefits:** Market-competitive compensation Health insurance Dental insurance Private pension plan Flexible benefits tailored to your needs Meal allowance Financial counseling Benefits club Remote work allowance Mobility allowance Childcare allowance Life insurance Extended leave policies Sports, wellness, and quality-of-life incentives Payroll-deductible loans with reduced interest rates **Apply now and join us in this transformation!** We are the **OLX Group**, a **100% digital** classifieds marketplace connecting over **7 million people**. A market **leader** in automotive, real estate, and used consumer goods sales and purchases, our diversified ecosystem provides an innovative platform for business and conscious consumption. Over **500,000 listings** are published daily, and our platforms—**(OLX, VivaReal, and Zap Imóveis)**—receive **70 million visits per month**. With technology built in Brazil, we democratize commercial access for everyone, making a positive contribution to the economy. Working at OLX means joining a **high-performance culture**, surrounded by the **best talent**. We **think big**, always **look ahead**, and strive to **lead our markets**. Thus, we **build trust** and generate **real impact** for businesses and people’s lives.