Rebirth 10: I'm a Promoter at Tencent

As the morning light of a new day crossed the horizon of Shenzhen Bay and spilled over the glass curtain walls of the office building, Lin Shen was already standing in front of the floor-to-ceiling window on the twelfth floor.

Today, he has to be the first one there.

"Ding-dong~"

The elevator notification sounded behind Lin Shen.

Li Yue was the first to walk in. Seeing Lin Shen's back as he stood by the window, she paused. "Boss?" she asked, putting down her backpack, her voice tinged with uncertainty, "Haven't been home all night?"

"Work is work, after all; you still have to go home. It's just..."

Lu Chuan followed closely behind, rushing in with a stack of folders. He stopped abruptly upon seeing the two of them: "Good morning, Brother Shen and Sister Yue! The latest roster from HR—" He stopped mid-sentence, noticing Lin Shen's expression, and his voice unconsciously softened, "What happened?"

"MiTalk added 50,000 new users yesterday," Lin Shen said calmly, as if stating a statistic unrelated to himself.

The office was silent for a few seconds.

"Fifty...fifty thousand?" Lu Chuan almost dropped the folder in his hand. "They've only been online for a few days? This growth rate..."

"That means their total user base will surpass ours within three days," Li Yue continued, walking to the whiteboard where the "shake-to-win" design sketches from last night's discussion still remained. "We have 150,000 users now, they have 140,000. At this growth rate..."

"That's Lei Jun's charm! Even with privacy risks, users don't care. At this growth rate, they might be twice our size in a week." Lin Shen walked to the conference table, put down his coffee cup, the metal bottom clinking against the glass surface. "And they updated the version quickly this morning, added group announcements and message recall features. Lei Jun said on Weibo that MiTalk will maintain 'two updates per week'."

More team members arrived one after another.

As soon as Cheng Xiangdong entered, he sensed something was off and quickly glanced at Lin Shen. Sun Hui put down his backpack and the first thing he did was check the server monitoring screen, but he kept an eye on this side out of the corner of his eye. Wu Feng and Wang Rui walked in talking in hushed tones, and when they saw everyone standing, they stopped talking in tacit agreement.

At 8:03, all nine members of the WeChat "founding team" arrived and stood in a loose semicircle in the morning light of the new office.

Lin Shen wasted no time. He walked to the whiteboard, picked up a marker, and wrote a few numbers next to the "shake" design:

WeChat: 15 users, accumulated during the cold start

MiTalk: 14 users, explosive growth in 2 days

The pen paused, and a small dot of ink smudged on the whiteboard.

"This is where we are now." Lin Shen turned to face the team. "A month and a half ago, the nine of us in the 'garage' gambled on whether 'the ultimate experience could win.' We won. With the concept of three-second registration and free SMS, we achieved 150,000 users without any promotion."

He paused, his gaze sweeping across everyone's faces: "But the battlefield has changed now. MiTalk, with a 2-person launch event, Lei Jun personally endorsing it, and a simple 'free + fast' copy, caught up with us in just two days. They don't care about privacy, restraint, or long-term user experience; all they care about is growth, data, and seizing the market as quickly as possible."

Lu Chuan opened his mouth as if to say something, but no sound came out.

"I know what you're thinking," Lin Shen continued. "We're doing the hardest thing—designing differential privacy algorithms, building a double-confirmation mechanism, and setting up defenses for every possible scenario that could be abused. Meanwhile, they're doing the easiest thing—copying our core functionality, increasing investment in promotion, and sprinting at a more aggressive iteration speed."

The marker drew heavy lines on the whiteboard, writing two words:

A smart way

Simple way

"Logically, the simplest approach wins." Lin Shen's voice was exceptionally clear in the quiet office. "This is how most business battles in history have been: better products lose to faster replication, deeper thinking loses to more aggressive promotion, and more far-reaching planning loses to more urgent monetization."

He put down his pen, placed his hands on the edge of the conference table, and leaned forward slightly: "But I don't believe in this common sense."

"WeChat 1.2 must be launched in 6 days." Lin Shen's tone left no room for doubt. "It's not 'should,' it's 'must.' It's not 'try our best,' it's 'complete.' What we're doing isn't 'just another version update,' but defining what social products of the next era should look like. While everyone is rushing headlong into data plunder, we're raising the banner of privacy protection; while everyone is pursuing feature stacking, we insist on user-friendly restraint; while everyone is focused on short-term growth, we're building long-term trust."

Li Yue was the first to nod, her eyes shifting from initial shock to determination: "Six days to develop three major modules in parallel: Shake, Privacy Center, and Performance Optimization. We need to clarify priorities and division of labor."

[At this point, I hope readers will remember our domain name 12199.99]

"Shake is the core feature," Cheng Xiangdong continued, walking to the whiteboard and pointing to the complex technical diagrams. "Location blurring algorithm, real-time double confirmation synchronization, session lifecycle management—each one is a deep water area of ​​technology. But if we succeed, it will be WeChat's deepest moat."

Sun Hui pulled up server monitoring data: "According to preliminary estimates, if the 'Shake' feature is fully enabled, peak concurrency may require forty servers. Our current manpower and resources..."

"Resources are not a problem," Lin Shen interrupted him, his tone unusually sharp. "Have you forgotten who we are?"

The office fell silent for a moment.

"We are Tencent," Lin Shen said, each word deliberate and clear, his voice low but each word like a nail hammering into the air. "China's largest internet company, a giant with a market value of hundreds of billions, possessing the most powerful technology platform, operation and maintenance system, and resource scheduling capabilities in the entire Chinese internet."

He walked to the window and pointed to the familiar buildings in the distance: "QQ has over 100 million concurrent users, and QQ Zone generates billions of posts every day. What are we afraid of regarding server pressure? We have the entire Tencent technology platform behind us. QQ can handle over 100 million concurrent users, so our volume is not even a warm-up."

"There's no need to worry about resource caps. I'll coordinate with the Technology Engineering Group (TEG) to have them create an independent resource pool for us. We can scale up servers online in seconds, no matter how many we need."

Lu Chuan's eyes lit up: "So, we're going all out this time?"

"Yes, full power!"

"This time, we're going to show Xiaomi what true domination is!"

"By the way, Lu Chuan, how's the new member going?"

Lu Chuan took the top page of the document in his hand. "HR has sent the final version of the personnel files and handover schedule. There are 22 people. The coordination with their original departments has been completed. Fifteen of them will arrive today, and the remaining seven will arrive by next Monday at the latest."

"Okay." Lin Shen took the list and glanced at it, his gaze lingering on a few key names—Liu Rui, Zhou Qian, Zhao Yiming…

When will Liu Rui and Zhou Qian arrive?

"9 points."

"We have time to do some preparation." He started typing on his computer.

WeChat version 1.2 core objectives

Shake It: Location blurring + double anonymity matching + gradual trust building, novelty retains users.

Privacy Center: Visualized permission management + transparent data lifecycle + user self-control, building a protective barrier for WeChat.

Today's highlights

New member integration and team building (Li Yue in charge, Lu Chuan assisting)

Shake-to-win technology solution review meeting (chaired by Cheng Xiangdong, with Lin Shen, Liu Rui, and Zhou Qian in attendance).

Privacy Center Interactive Design Finalized (Lin Shen + Li Yue + Zhao Yiming)

Server stress testing and expansion solution (led by Sun Hui, new operations and maintenance team of three)

Competitor dynamic monitoring and response plan (Luchuan 24/7)

-----------------

At 9:00 AM sharp, Liu Rui met Lin Shen in his office.

The product manager, in his early thirties, was wearing a simple plaid shirt and carrying a backpack that looked like it had been used for many years. He was surprised by Lin Shen's youth, but quickly recovered from his surprise.

"Mr. Lin, thank you for giving me this opportunity." These were Liu Rui's first words after sitting down. "Regarding QQ... I haven't touched the core business for half a year."

"I've read your three internal reflection reports." Lin Shen got straight to the point, pushing the printed copies in front of the other party. "Regarding the 'People Nearby' feature, your core argument is: stranger social networking based on precise geographical location is essentially unfriendly to female users, a high-risk scenario for privacy leaks, and a breeding ground for offline security risks."

Liu Rui's fingers tightened around the edge of the paper, his knuckles turning white: "Yes. But they think I'm 'worrying unnecessarily,' 'not understanding the essential needs of social products,' and 'using moral fastidiousness to hinder business growth.'"

"We sent you the project materials for WeChat yesterday, but now, what do you think of WeChat's 'Shake' feature?" Lin Shen pulled up the design diagram. "It's also a location-based social networking feature for strangers, but the logic is completely different. We don't pursue precise location; we only do fuzzy area matching within a 500-meter radius. We don't pursue fast connections; we set a 15-second two-way confirmation buffer. We don't pursue session retention; we designed a 15-minute time limit for conversations and support one-click deletion."

Liu Rui stared at the interaction flowchart on the screen, his eyes gradually brightening.

He stared at it for a full three minutes, then pulled out a pen and notebook from his bag and quickly drew a few supplementary lines: "Here... what if we could add a lightweight 'reason for matching' hint at the stage where a match is successful but not yet confirmed? For example, 'You are both in this area, and you have both recently searched for the same coffee shop'—not specific information, but just an implication that you have something in common, which would greatly increase the confirmation rate."

Lin Shen raised an eyebrow: "Is it technically possible?"

"We need lightweight local data analysis, but without uploading any specific content; we only need to generate feature codes." Liu Rui's speech quickened, entering his familiar mode. "Actually, this is similar to the 'hidden connection' logic of WeChat 1.1 group creation. It identifies commonalities based on local analysis and uses anonymized methods to indicate potential connections. If the 'Shake' feature can reuse this architecture..."

"Then it's connected." Lin Shen continued, "WeChat's stranger social networking isn't an isolated feature, but a complete connection system that respects privacy. Shake is the entry point, hidden connections are the deepening, and there can be even more in the future."

He leaned forward, looking at Liu Rui: "What I need you to do is not just develop this feature, but make it a benchmark, to show the entire industry that stranger social networking doesn't have to sacrifice privacy, doesn't have to harass women, and can be safe and fun. Can you do that?"

Liu Rui's Adam's apple bobbed. His gaze shifted from the screen to Lin Shen's face, then back to the scribbled sketches on his notebook.

Then he raised his head, his voice a little hoarse, but very firm:

"Mr. Lin, do you know what I've been thinking about every day for the past six months? I've been wondering if I've really made a mistake, if this industry can only be like this, trading data for growth, privacy for convenience, and women's sense of security for men's social satisfaction. I even started writing a transfer application, wanting to leave the product role and go into technical architecture, because I feel... hopeless."

He took a deep breath: "But now you're telling me there's another possibility, that someone is willing to invest top resources to do something 'right but difficult.' If I can't seize such an opportunity, I'll never forgive myself for the rest of my life."

"That proves you're right." Lin Shen stood up, glanced at the time, and said, "The technical review meeting is at ten o'clock. You and I will attend together. Also, Zhou Qian, the algorithm expert from that research institute will be there. The two of you need to work closely together. I'll give you three days to come up with a solution that I can approve."

"Three days..." Liu Rui also stood up and nodded vigorously, "That's enough."

At 10:00 AM sharp, nearly twenty people were seated in the large conference room.

There was a mixed feeling in the air: the composure of the veteran players, the tension of the new players, and the focus that everyone had when facing a tough battle.

Cheng Xiangdong stood in front of the whiteboard, the red dot of the laser pointer moving between the architecture diagrams on the screen: "The core technical challenges of the shake-to-play feature can be summarized into three levels of problems."

He switched slides:

The first layer: the balance between privacy protection and matching accuracy, the noise injection intensity of differential privacy algorithms, the granular design of region coding, and the possibility of dynamic adjustment of the matching radius.

The second layer balances real-time interaction with system stability, precise synchronization with 15-second two-way confirmation, management of high-concurrency long connections, and network latency and timeout circuit breaker mechanisms.

The third layer: unifying user experience and security control, local storage solutions for time-limited dialogues, rapid response to reports and risk control, and balancing data auditability and user anonymity.

"On the first floor," Cheng Xiangdong said, looking towards the back of the conference room, "Zhou Qian provided the research institute's latest differential privacy optimization solution. Zhou Qian?"

Zhou Qian stood up.

She looked younger than her actual age, with a ponytail, black-rimmed glasses, and a white shirt buttoned all the way up. But when she spoke, her voice was clear and calm, with the precision characteristic of an academic researcher.

"Traditional differential privacy applications for location protection typically employ Laplace or exponential mechanisms to add noise to the real coordinates. However, our research has found that for social matching scenarios, simply injecting coordinate noise leads to two problems: first, the matching success rate drops sharply as the noise intensifies; second, the regional boundary effect is significant, meaning that two people who are actually very close but are assigned to different noise regions may never be able to match."

She drew a diagram on the whiteboard: "Therefore, we propose the 'Dynamic Grid Differential Privacy' scheme. Instead of drawing circles with a fixed radius centered on the user, we dynamically divide the entire city into privacy grids of varying sizes. The grid division is based on multiple factors such as population density, building distribution, and historical matching data, ensuring that there are at least k users in each grid. This k value is our privacy protection parameter."

The new Android engineer raised his hand: "What about during the matching process...?"