Senior Fullstack Engineer – Customer Experience Platform & Support Automation Leader at arenaflex

Join the Future of Commerce with arenaflex!

arenaflex is the largest livestream shopping platform across North America and Europe, empowering millions of users to buy, sell, and discover the products they love. By blending community, entertainment, and commerce into a single, vibrant ecosystem, we are redefining the way people shop online. Our remote‑first, co‑located teams are united by a shared purpose, guided by our core values, and spread across hubs in the United States, United Kingdom, Ireland, Poland, and Germany. Together, we are building the next generation of online marketplaces.

From fashion and beauty to cutting‑edge electronics, rare collectibles such as trading cards, comic books, and even live plants, our live auctions attract a diverse audience. As one of the fastest‑growing marketplaces in the industry, arenaflex is on a relentless trajectory of expansion, and we need bold, forward‑thinking problem solvers to help us scale every facet of the business.

The Role

arenaflex is seeking a Senior Fullstack Engineer to join our Customer Experience team. In this role, you will design, develop, and own a world‑class Customer Support platform that handles a high volume of complex, multi‑modal support requests—from technical glitches to purchasing and logistics challenges—for both buyers and sellers. You will be responsible for creating intuitive user‑facing experiences, scaling internal tooling, and building intelligent automation that resolves thousands of customer issues per hour.

Key aspects of the role include:

• Architecting end‑to‑end solutions that translate ambiguous business problems into clear, maintainable technical designs.
• Driving rapid delivery cycles while maintaining a focus on product impact, reliability, and technical excellence.
• Collaborating closely with product managers, designers, data scientists, and support specialists to iterate on features that directly improve customer satisfaction.
• Mentoring junior engineers, fostering an inclusive culture, and championing best practices across the team.
• Ensuring the platform is highly available, secure, and performant at scale, supporting a global user base.

Team members are expected to be within commuting distance of our San Francisco, Seattle, Los Angeles, or New York hubs, though flexible remote arrangements are supported for the right candidate.

Who You Are

arenaflex thrives on low‑ego collaboration, a growth mindset, and a relentless focus on impact. As our next Fullstack Engineer, you should bring at least five years of full‑time software engineering experience in high‑growth environments, along with the following attributes:

• Educational Foundation: Bachelor’s degree in Computer Science, a related discipline, or equivalent hands‑on experience.
• Backend Expertise: Demonstrated ability to build end‑to‑end, high‑scale product experiences. Proficiency with Python and relational databases such as PostgreSQL is highly desirable.
• Frontend & Mobile Acumen: Experience with modern web frameworks (e.g., Next.js) and/or native mobile development, enabling you to ship seamless, responsive interfaces.
• Ownership Mindset: A track record of taking projects from concept through production and beyond, delivering high‑quality features at lightning speed.
• Product Instinct: Strong intuition for translating user needs into elegant technical solutions that drive measurable business outcomes.
• Problem‑Solving Prowess: Comfort navigating ambiguity, breaking down complex problems, and delivering creative, autonomous solutions.
• Team Leadership: A proactive approach to improving team dynamics, fostering an inclusive environment, and mentoring peers.

Essential Qualifications

• 5+ years of professional software development experience, preferably in fast‑moving startup or scale‑up environments.
• Strong command of Python, RESTful API design, and relational database modeling (PostgreSQL or equivalent).
• Hands‑on experience with modern front‑end technologies such as React, Next.js, or similar frameworks.
• Proficiency in building, deploying, and monitoring cloud‑native services (AWS, GCP, or Azure).
• Demonstrated ability to write clean, testable, and well‑documented code.
• Excellent communication skills, with the ability to articulate technical concepts to non‑technical stakeholders.

Preferred Qualifications

• Experience with GraphQL, WebSockets, or real‑time data streaming technologies.
• Familiarity with containerization (Docker) and orchestration (Kubernetes) for scalable deployments.
• Background in building AI‑driven automation or chatbot solutions for customer support.
• Knowledge of CI/CD pipelines, automated testing frameworks, and DevOps best practices.
• Previous work on high‑traffic, latency‑sensitive platforms serving millions of concurrent users.

Core Skills & Competencies

• Technical Breadth: Ability to move fluidly between backend services, front‑end UI, and infrastructure layers.
• Analytical Thinking: Data‑driven decision making, leveraging metrics to iterate on product performance.
• Collaboration: Strong partnership skills with cross‑functional teams, including product, design, and support.
• Adaptability: Thrive in a fast‑changing environment, quickly learning new technologies and domains.
• Customer Empathy: Deep understanding of the end‑user experience, translating empathy into actionable engineering solutions.

Career Growth & Learning Opportunities

At arenaflex, your career trajectory is limited only by your ambition. As a senior engineer, you will have access to:

• Leadership pathways that can evolve into Engineering Manager, Principal Engineer, or Product Lead roles.
• Continuous learning budgets for conferences, certifications, and advanced coursework.
• Mentorship programs pairing you with industry veterans and thought leaders.
• Opportunities to contribute to open‑source projects and internal tech talks, raising your professional profile.
• Cross‑team rotations that broaden your expertise across the full stack of arenaflex’s product ecosystem.

Work Environment & Culture at arenaflex

arenaflex cultivates a culture of curiosity, inclusion, and impact. Our teams operate in a hybrid model that balances remote flexibility with vibrant office hubs where collaboration thrives. Key cultural pillars include:

• Innovation First: We encourage experimentation, rapid prototyping, and data‑backed iteration.
• Inclusive Community: Diverse perspectives are celebrated; we actively build a workplace where every voice is heard.
• Ownership & Autonomy: Engineers are empowered to own their projects end‑to‑end, making decisions that shape the product roadmap.
• Well‑Being Focus: Comprehensive health, wellness, and mental‑health resources support a balanced life.
• Playful Spirit: Regular hackathons, game nights, and community events keep the atmosphere lively and creative.

Compensation, Perks & Benefits

arenaflex offers a competitive total rewards package designed to attract and retain top talent:

• Base Salary & Equity: Market‑aligned salary combined with an attractive stock‑option plan.
• Flexible Time Off: Generous PTO policy, company‑wide holidays, and seasonal breaks (spring and winter).
• Health & Wellness: Comprehensive medical, dental, and vision coverage; wellness stipend and mental‑health resources.
• Remote Work Support: Home‑office setup allowance, monthly internet and phone subsidies.
• Family Benefits: Childcare stipend, parental leave (up to 16 weeks paid), and family‑planning assistance.
• Retirement Plans: 401(k) with employer match up to 4% (U.S.) and pension options for international employees.
• Learning & Development: Annual education budget, conference attendance, and internal training programs.
• Dog‑Fooding Budget: Dedicated allowance for employees to actively use arenaflex’s platform as buyers and sellers, fostering deep product empathy.

Why Join arenaflex?

If you are passionate about building technology that directly touches millions of lives, thrive in a high‑velocity environment, and want to shape the future of live commerce, arenaflex is the place to make that impact. You will work alongside visionary product thinkers, world‑class engineers, and a community that celebrates curiosity and boldness.

Ready to bring your expertise to a platform that is redefining e‑commerce? Apply today and become a pivotal part of arenaflex’s mission to turn passion into business and connect people through commerce.

Equal Opportunity Employer

arenaflex is proud to be an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees, regardless of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, parental status, disability, or any other characteristic protected by law.