Twenty-one years. Seven chairs. One thread, the buyer.

Each chair taught one rule that ended up as code in substrate.
Real companies, real dates, real lessons.
The product marketing seat is the last one. The other six made it work.

Sales · Hutch Telecom, then ICICI Bank · 2005 to 2007

First job out of college, two separate stints of about a year each.
Hutch Telecom (which became Vodafone India) in 2005 to 2006, selling postpaid plans.
Then ICICI Bank in 2006 to 2007, selling mutual funds.
Door-to-door and over-the-phone in both seats.
Two years of hearing every objection in person, learning to read a face before reading a script.

A single fabricated detail unravels months of customer trust. Churn is not a post-sales problem.

What's in substrate because of this

• PRINCIPLES.md. Honesty under pressure: the rule that says no when the brief asks for a claim you can't source.
• knowledge/patterns/status-quo-is-the-real-objection-outbound. Why the buyer's first no almost always points at the incumbent process, not the new vendor.
• knowledge/contradictions/save-everyone-vs-let-the-wrong-fit-go. The trust-first costing model written as a tension, not a slogan.

Subject Matter Expert / Customer Service · C3i Inc. (acq. Telerx/Merck, 2014) · 2008 to 2011

Subject Matter Expert on the customer service desk.
C3i was a life-sciences IT support specialist serving Merck through Telerx.
I supported multiple hardware SKUs and software applications for pharma clients across APAC and the Americas.
Phone-and-ticket frontline.
I also wrote the training materials for the incoming support reps, which is the first time I noticed the answer to most product problems was already in a document the customer couldn't find.

Your customer's first words are almost never the problem. That's two questions in.

What's in substrate because of this

• skills/tactical-empathy-discovery. The two-question routine, generalized.
• routines/frontline-contact-routine. Stay close to live tickets, even at strategy altitude.
• knowledge/patterns/frontline-as-pmm-substrate. Always ask which document the customer was trying to find.

Operations Lead / Technical Support · Knoah Solutions (now IntouchCX) · 2011 to 2015

Started 2011 on technical support for HP / webOS, the year HP killed the TouchPad and webOS turned into the cautionary tale every product manager cites.
Phones rang anyway.
From 2012 I moved into Data Operations and people management, co-leading what grew into a 100+ analyst team building what was effectively a ZoomInfo competitor.
Owned hiring, QA, escalation, and the operational scaling of an org that grew hard during my tenure.
First time I shipped a function from zero, not a project.
First time I sat on the other side of a doomed product launch and had to keep the queue moving anyway.
Knoah was acquired by 24-7 Intouch in Feb 2020, now rebranded IntouchCX.

Whoever owns the source system owns the metric. Everyone else is reading.

What's in substrate because of this

• knowledge/patterns/metric-tree-not-metric-stack. Own the source system or don't claim the metric.
• skills/metric-tree-design. The signed object that defines what we move and how we count it.
• skills/analytics-pull. The first move on any engagement: pull the raw numbers from the source system before anyone reframes them.

Manager, Social Media — Online Reputation · LeEco · Dec 2015 to Feb 2017

Built India's social support team from scratch for the LeTV India (later LeEco India) launch.
Ran the LeMe Community forum at forum.letv.com/in as the moderator handle LeMeIndia alongside the brand's social handles (@LeEcoIndia on Twitter, the Facebook page).
Authored the LeTV-to-LeEco rebrand announcement post in February 2016.
At peak we handled thousands of customer queries a day across the forum, Twitter, and Facebook.
First exposure to brand reputation as a metric that costs revenue when it slips.

The fastest way to lose a launch is to
let your angriest customers write PR for you.

Forum proof: the LeMeIndia staff account I operated logged 237 messages and 1,133 likes received in its first four months. The community grew to 10,000 members by end of Jan 2016. 10K SuperFans milestone thread, Feb 2016 · Founding "Welcome" thread.

Third-party press: Mobility India (Dec 2015): "Fans say the forum is very interactive and dynamic with every discussion, query or post immediately responded to in real time by the moderators of the community." Read. Deccan Chronicle (Feb 2016) reported social-comment volume tripled from 2,000 to 6,000 per week post-launch on the channels I owned. Read. PRNewswire (Jun 2016) names LeMe Community as a core conversion channel.

Thought leadership from the seat: "Online Reputation Management for Your Business" on LinkedIn Pulse, Jan 2017.

What's in substrate because of this

• skills/social-listening-themes. The escalation taxonomy for launch-week noise, distilled from real ticket clusters.
• knowledge/patterns/launch-as-coordinated-distribution. The cadence that keeps the loudest customer from becoming the loudest critic.
• PRINCIPLES.md. Honesty under pressure: the same rule, applied to launch-week comms.

Content marketing · Flock (Directi Group) · 2017 to 2021

Senior Content Marketing Specialist.
Wrote every marketing page and every support article for two products: Flock (team messaging, a Slack competitor) and Titan Email.
Three homepage iterations across the positioning evolution: feature-rich (2019), remote work (2020), collaboration workspace (2021).
Also where I first worked with Kushal, who would later bring me in twice more on consulting that converted to full-time.

Quality content and distribution are your moat.

Public byline trail: blog.flock.com/author/kesava-mandiga (30+ posts, live). Cross-posted to Medium flock-chat.

What's in substrate because of this

• skills/help-docs. Treat the help center as a primary marketing surface, not a support cost.
• skills/help-content-gap-detect. Find the question the customer typed before writing the article.
• knowledge/patterns/quality-as-growth-lever. The filter that says fewer better posts, not more posts.

Product marketing · Wingman, Fincent, JustCall · 2021 to 2026

Wingman first. Hired by Kushal as a consulting engagement that converted to full-time.
Founding PMM, sole PMM through most of year one, then hired the second.
Repositioned the homepage in 47 days. +86% conversions.
Stayed through the Clari acquisition in Jun 2022.

Fincent next. First marketer, Dec 2022 to Feb 2024. Built the function from zero.
Rebuilt the homepage on a Value Proposition Canvas.
+23% conversions and 3x time on page, with 78 Wayback snapshots to walk anyone through the change.

JustCall after that. Started as a consulting engagement with Kushal at the end of 2023 (the third time she pulled me in that way).
Converted to full-time PMM in June 2024.
Built the function and grew into the Head of PMM seat.
Six homepage refreshes, 30+ CRO experiments, an 18-competitor intelligence system, deal-level enablement attribution, an AI-native pipeline that caught a math error on a live PPC page.
Resigned 6 May 2026.

The buyer panel is the signal, not internal applause.

What's in substrate because of this

• routines/customer-conversation-rhythm. The interview cadence that keeps positioning grounded in live buyer language.
• skills/positioning-forge. The two-contender test, structured and runnable.
• knowledge/patterns/diagnose-before-execute. If it doesn't hurt to read, it isn't honest.

AI-native · 2025 to now

The shift from writing prompts to authoring the context AI reads.
Built the Claude Code pipeline that runs the PMM function at JustCall — the precursor to substrate, which I open-sourced after the resignation.
Run miniu and abcodex on myself, in public, as the loop a consulting client would buy.

AI is not the multiplier. The context AI reads is.

What's in substrate because of this

• The substrate repository, in its current form.
• case-commons.html. The live operator substrate, five operators, one source.
• case-miniu-abcodex.html. The system I run on myself first, in public, before installing it for a client.

The thread

Seven chairs across twenty-one years. Each one taught a rule that became code.
The substrate is the cumulative authorship of every chair, written in a form an AI can read and a buyer can audit.
That's the arc. One sentence.