Last weekend, Lintong Lyu served as a judge at Hackers 2025, Rutgers Women in Computer Science's annual 24-hour hackathon. The event brought together over 200 talented individuals to tackle some of the most pressing issues in tech, including AI, social good, arts and media, and financial solutions. As he witnessed the creativity and ingenuity on display, it was clear that empowering women in tech is crucial for driving innovation.

This experience reinforced Lintong's passion for developing innovative solutions that can drive growth and empower underrepresented groups in tech. In his work as a growth product manager, he has focused on account access innovations that can help bridge the gap between technology and accessibility. By developing cutting-edge solutions that balance user needs, security, and operational costs, Lintong aims to create a more inclusive and secure digital landscape.

One area where innovation is particularly crucial is account recovery. Traditional methods often fall short, leaving users vulnerable to security risks and frustrating experiences. Lintong's work has shown that by blending economics, technology, and creativity, it's possible to develop strategies that drive multi-million monthly active user (MAU) growth while saving billions of dollars.

Driving Smarter Account Recovery Solutions

Account recovery is a universal challenge in tech, impacting millions of users and posing significant cost and security challenges for companies across the industry. Forgetting a password—a seemingly mundane problem—costs companies billions annually. Traditional methods like sending SMS codes come with significant drawbacks: they’re expensive, require companies to pay per message, and aren’t always reliable due to delivery failures or outdated contact information. The stakes are high, as unresolved issues around account access can lead to user churn, diminished trust, and even reputational damage.

Lintong’s approach challenged this status quo. By analyzing user data, he identified opportunities to broaden recovery methods, reducing dependency on costly SMS messages while simultaneously addressing accessibility gaps for users. One groundbreaking innovation was the introduction of selfie verification to the account recovery flow. This novel approach allows users to upload a selfie, which is then validated against historical data using advanced machine learning algorithms. This not only ensured secure access for millions of users but also minimized costs—a remarkable achievement for an industry still reliant on outdated verification systems.

To further optimize recovery, Lintong partnered with WhatsApp, launching a product that enabled users to receive recovery codes via the messaging platform. Compared to SMS, WhatsApp offered a more cost-effective and reliable alternative, providing significant savings while expanding accessibility to users who might not have functioning phone numbers. By seamlessly integrating these methods, Lintong demonstrated that innovation could dismantle traditional constraints, offering a scalable solution that benefits both users and the bottom line. These approaches not only transformed his company’s account recovery processes but also set a precedent for the tech industry. They illustrate how innovative recovery methods can inspire other companies to rethink their own strategies, achieving scalable growth while maintaining cost-efficiency and security.

Building on these successes, Lintong further innovated with the introduction of Flashcall, a cutting-edge authentication method that leveraged missed calls for account verification. This solution bypasses the traditional SMS framework entirely, utilizing the phone network's caller identification system to confirm user identity in real time. Flashcall not only enhanced reliability by eliminating SMS delivery issues but also significantly reduced costs associated with text message-based verifications. By pioneering this approach, Lintong demonstrated his ability to think beyond conventional methods, delivering a solution that optimally balances efficiency, security, and accessibility. Flashcall has since become a benchmark for authentication innovation, inspiring the industry to explore novel, cost-effective account recovery techniques.

Balancing Growth and Security

Driving growth is one thing; ensuring that it’s sustainable and high-quality is another. For Lintong, growth isn’t about simply increasing numbers—it’s about ensuring that every new user adds genuine value to the ecosystem without compromising security. This dual focus is particularly critical in account recovery, where ease of access for legitimate users must be balanced against safeguarding accounts from bad actors.

To achieve this, Lintong implemented a robust security framework that prioritized high-quality growth:

1. Quantitative Guardrails: He established metrics such as hacked user rates and benign user growth to measure the trade-offs between accessibility and security. These benchmarks ensured the team stayed vigilant against unintended risks while optimizing recovery flows.
   
   
2. Lower-Funnel Monitoring Tools: By developing tools to track suspicious activity, such as abnormal login attempts or excessive recovery requests, Lintong’s team gained real-time insights into potential vulnerabilities, enabling them to adapt tactics proactively.
   
   
3. User Segmentation by Security Levels: Lintong’s data analysis identified key security signals, such as device vettedness and cross-app vettedness, allowing users to be categorized into tiers based on their trust profiles. This segmentation enabled tailored recovery strategies—providing a frictionless experience for trusted users while applying stricter protocols for high-risk cases.

This approach not only safeguarded user accounts but also set a new industry standard for balancing growth and security. By embedding security measures directly into growth strategies, Lintong’s work underscored that innovation is as much about protection as it is about expansion.

Redefining Growth for the Tech Industry

The impact of Lintong’s achievements extends far beyond his company. Account recovery challenges are universal across tech, and his solutions have demonstrated how innovation can redefine the growth landscape. Traditionally, companies faced a trade-off: grow quickly but incur higher costs or prioritize security at the expense of usability. Lintong’s work has shown that this trade-off is no longer inevitable. By creating diverse recovery methods, he’s expanded the growth "Pareto frontier," proving that companies can achieve scalability, security, and cost-efficiency simultaneously.

This multi-dimensional approach has profound implications for the broader tech industry. It’s a reminder that the future of growth lies in creativity—rethinking constraints and pushing boundaries to deliver solutions that are smarter, safer, and more sustainable. For Lintong, it’s not just about numbers; it’s about creating systems that work for everyone: users, companies, and the industry at large.

As tech continues to navigate an era of financial discipline, the question isn’t whether growth is possible, but how it can be achieved without sacrifice. Lintong’s story provides a compelling answer—one rooted in innovation, strategy, and a vision for what’s possible when we redefine the cost of growth.

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