Experienced Account Manager – Third-Party Marketplace Seller Development & E-Commerce Growth (Remote, Brazil)

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About arenaflex

At arenaflex, we're on a bold mission to become the most customer-centric company on the planet. Every day, we work to build the definitive destination where people can discover, explore, and purchase virtually anything online. We're not just operating an e-commerce platform—we're shaping the future of global commerce, creating opportunities for millions of sellers to reach customers around the world, and redefining what's possible in the digital marketplace.

If you're someone who thrives in a fast-paced, entrepreneurial environment and wants to be part of a team that's transforming how the world shops, arenaflex is the place for you. We're looking for driven, passionate individuals who bring energy, creativity, and a customer-first mindset to everything they do. Here, your contributions matter, your ideas shape outcomes, and your career trajectory is limited only by your ambition.

We're currently seeking a dynamic and results-driven Account Manager to join our growing Third-Party (3P) Marketplace team in Brazil. This is a fantastic opportunity for professionals who are excited about e-commerce, passionate about helping sellers succeed, and ready to make a meaningful impact in one of the world's most vibrant digital marketplaces.

Position Overview

As an Account Manager on our 3P Marketplace team, you'll be instrumental in expanding our seller ecosystem and enhancing the product selection available to customers across Brazil and beyond. This role is chartered with acquiring, developing, and managing high-value seller relationships that bring new product categories, competitive pricing, and unparalleled convenience to our customers.

You'll be responsible for identifying market gaps, executing go-to-market (GTM) strategies, and recruiting key marketplace players to join our platform. Your efforts will directly contribute to expanding our product selection, growing our customer base, and solidifying arenaflex as the premier e-commerce destination in Latin America.

Key Responsibilities

Your primary responsibilities as an Account Manager will span the full spectrum of seller lifecycle management. You'll serve as both a strategic advisor and a hands-on collaborator for our seller partners, ensuring they have the tools, insights, and support needed to succeed on our platform.

Seller Acquisition & Business Development

• Identify, prospect, and recruit high-potential sellers to join the arenaflex marketplace through direct sales outreach, industry events, webinars, and targeted presentations


• Develop a thorough understanding of the Brazilian e-commerce landscape, including market segments, seasonal trends, competitive dynamics, and emerging opportunities


• Create and deliver compelling value propositions that demonstrate the benefits of selling on our platform


• Build and maintain a robust pipeline of prospective sellers across multiple product categories

Seller Enablement & Growth

• Onboard new sellers and guide them through the integration process, ensuring a smooth and efficient launch on our platform


• Share best practices for online selling, including data-driven insights that help sellers achieve excellence in delivery performance, customer experience, and business growth


• Collaborate with sellers to develop effective pricing strategies, promotional plans, and inventory management approaches


• Conduct regular business reviews with sellers to analyze performance metrics, identify growth opportunities, and address challenges

Strategic Planning & Market Analysis

• Analyze market trends, consumer behavior, and competitive activities to identify untapped opportunities and emerging product categories


• Monitor competitor efforts and industry developments to inform strategic decision-making


• Develop and execute GTM strategies that attract key marketplace players and expand our product selection


• Work closely with internal cross-functional teams to align seller acquisition efforts with broader business objectives

Stakeholder Management

• Engage and influence both internal and external stakeholders to drive seller success and resolve any issues that arise


• Serve as the primary point of contact for assigned seller accounts, building strong relationships and ensuring high levels of satisfaction


• Coordinate with teams across merchandising, marketing, logistics, and customer service to deliver seamless seller experiences

Essential Qualifications

We're looking for candidates who bring a combination of commercial acumen, relationship-building skills, and a passion for e-commerce. The ideal candidate will be a self-starter who thrives in ambiguity and enjoys the challenge of building something new.

• Educational Background: A bachelor's degree is required. Degrees in Business, Economics, Marketing, or related fields are strongly preferred.


• Professional Experience: 1 to 3 years of successful business-to-business (B2B) sales experience is required. Prior experience in e-commerce, technology, retail, FMCG (Fast-Moving Consumer Goods), or digital platforms is highly valued.


• Proven Track Record: Demonstrated success in exceeding sales targets using consultative and solutions-focused selling approaches


• Market Entry Experience: Experience launching new products or services into emerging markets is a strong advantage


• Communication Skills: Exceptional verbal and written communication skills, with the ability to present confidently and negotiate effectively with stakeholders at all levels


• Analytical Capabilities: Strong quantitative and analytical skills, with comfort working with complex data sets and deriving actionable insights


• Technical Proficiency: Advanced working knowledge of Excel and MS Office programs; ability to quickly learn and adapt to new technologies and platforms


• Adaptability: Ability to thrive in ambiguous, fast-paced environments and effectively manage multiple competing priorities simultaneously


• Entrepreneurial Mindset: A proactive, self-motivated approach with a passion for results and a winning attitude


• Language Skills: Fluency in Portuguese (native or professional proficiency) is required; English proficiency is a strong plus

Preferred Qualifications

While not strictly required, the following experiences and background traits will help you stand out:

• 2+ years of experience in e-commerce operations, marketplace management, or digital marketplace development


• 3+ years of experience in the consumer electronics industry or related technology sectors


• 3+ years of direct B2B sales experience, preferably in digital or platform-based business models


• Familiarity with marketplace dynamics, seller ecosystems, and platform economics


• Experience working with international teams or cross-border e-commerce


• Knowledge of Brazilian retail and e-commerce trends, key players, and consumer preferences

Skills & Competencies

To excel in this role, you'll need to demonstrate the following core competencies:

• Customer Obsession: A genuine passion for understanding customer needs and ensuring seller partners can deliver exceptional experiences to end consumers


• Strategic Thinking: Ability to see the big picture, anticipate market shifts, and develop long-term seller strategies


• Relationship Building: Strong interpersonal skills that enable you to establish trust, credibility, and lasting partnerships with sellers

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• Data-Driven Decision Making: Comfortable using data and analytics to inform strategies, measure performance, and identify opportunities


• Execution Excellence: A hands-on approach with the ability to manage multiple projects, meet deadlines, and drive results


• Collaborative Spirit: Ability to work effectively across functional teams and influence stakeholders without direct authority

Career Growth & Learning Opportunities

At arenaflex, we invest heavily in the growth and development of our people. This role offers exceptional exposure to the inner workings of a world-class e-commerce platform, providing you with a comprehensive understanding of marketplace dynamics, seller management, and digital commerce at scale.

You'll have the opportunity to:

• Develop expertise in one of the fastest-growing sectors of the global economy


• Work alongside talented professionals from diverse backgrounds and disciplines


• Gain hands-on experience with cutting-edge e-commerce tools, technologies, and methodologies


• Build a strong foundation for future leadership roles within the organization


• Expand your professional network within the Brazilian and global e-commerce ecosystem

We're committed to helping our employees reach their full potential through continuous learning, mentorship, and career development programs tailored to your individual goals.

Work Environment & Culture

arenaflex is a place where innovation thrives, and diversity is celebrated. We foster a collaborative, inclusive culture where every team member's voice matters. Our work environment is dynamic and fast-paced, reflecting the rapid evolution of the digital commerce landscape.

As a remote position based in Brazil, you'll enjoy the flexibility to work from home while staying connected with your team through modern collaboration tools and regular virtual interactions. We value results over rigid schedules, empowering you to work in ways that maximize your productivity and work-life balance.

At arenaflex, we believe that diverse teams build better products and create more innovative solutions. We welcome applicants from all backgrounds and are committed to providing equal employment opportunities.

Compensation & Benefits

We offer competitive compensation packages that recognize your skills, experience, and contributions. Our comprehensive benefits package includes:

• Competitive base salary with performance-based bonuses


• Health and well-being benefits


• Professional development and training opportunities


• Flexible work arrangements


• Access to cutting-edge tools and resources


• Opportunities for career advancement within a growing global organization

Join Our Team

If you're ready to be part of something big, to challenge yourself, and to help shape the future of e-commerce in Brazil and beyond, we want to hear from you. We're looking for passionate, driven individuals who are eager to make an impact and contribute to our mission of being Earth's most customer-centric company.

This is your chance to write your own success story and be part of a team that's making history in the world of digital commerce. Apply today and take the first step toward an exciting career with arenaflex!

To apply for this position, please submit your resume and cover letter through our careers portal. We review applications on a rolling basis and encourage you to apply as soon as possible.