Nikhil Singh Rathore

Technical Depth

Two layers, not one.

Most retention specialists work at the Klaviyo interface level — flows, campaigns, segments. I work at both layers. The interface layer is where strategy lives. The API and data layer underneath it is where revenue is lost or protected. It determines whether flows fire correctly, whether segments update reliably, whether integrations stay connected, and whether revenue attribution reflects reality. A Computer Science Engineering background gives me the ability to work confidently at both.

41

Documented failure scenarios

Six categories of API diagnostic scenarios documented in full. Not a credentials list — this is what breaks under volume, and why, and how to fix it before BFCM discovers it.

3

Brand-facing calculators

Instagram ROI, mobile channel comparison (SMS vs RCS vs WhatsApp), and quiz funnel 12-month compounding model. Benchmarked against Klaviyo 2026 data from 183,000+ brands.

CS Engineering foundation

B.Tech Computer Science Engineering, Poornima College of Engineering, Jaipur. This background enables me to read API documentation, debug webhook payloads, and build Make.com pipelines without guesswork.

4

Omnichannel stacks

WhatsApp via Meta Business API. Google RCS for Business. Instagram ManyChat automation. Zero-party data quiz funnels. All four built from scratch and documented in full.

This is not just a credentials list. It is 2+ years of going further than the role required because the gap was real and nobody else was filling it.

Capability Areas

Five areas. Each with documentation.

Every capability below is backed by a detailed guide — real scenarios, real debugging steps, real architecture decisions. Click any card to read what the work actually looks like.

API Diagnostics

41 scenarios across 6 categories. The layer underneath Klaviyo that determines whether everything else works.

Most retention problems that cannot be solved at the Klaviyo interface level originate in the data pipeline underneath it. Broken event tracking. Malformed profile properties. Webhook failures that produce no visible error. Segment conditions that evaluate correctly but fire at the wrong time. API rate limit collisions between simultaneous integrations. These are the failure modes that cost revenue during high-volume periods and go unnoticed until Q4 is already over.

41 scenarios documented. 6 categories: event tracking failures, profile property conflicts, webhook architecture errors, segment evaluation logic, integration collision patterns, and attribution drift.

Read the full guide →

WhatsApp Marketing

Meta Business API integration inside a live Klaviyo account. 18 scenarios documented.

WhatsApp marketing via Meta Business API sits inside the same Klaviyo account as the email and SMS stack. The same flows. The same segments. The same profile data. What changes is the delivery layer and the consent model. WABA setup, message template approval, HSM structure, and the connection between Meta Business Suite and Klaviyo flows — all documented with 18 failure scenarios specific to this channel.

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Google RCS for Business

Registered through Klaviyo's Google partnership. Rich cards, SMS fallback, verified sender.

RCS for Business is registered through Klaviyo's Google partnership — which means it lives natively in Klaviyo flows alongside email and SMS, not as a third-party integration. Rich product cards. Verified brand sender identity. Automatic SMS fallback for devices that cannot receive RCS. This channel is in a first-mover window that closes early 2027 to mid-2027 as adoption becomes standard. 20 scenarios documented.

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Instagram ManyChat Automation

Comment-to-DM and story reply flows connected to Klaviyo via Make.com. 22 scenarios.

Instagram DM via ManyChat connects directly to Klaviyo through a Make.com automation pipeline. A follower comments a keyword on a post — ManyChat sends a DM, captures the email, Make.com creates or updates the Klaviyo profile, and the contact enters a welcome flow within seconds. Story replies, follow-to-DM, and multi-keyword routing documented across 22 scenarios including the validation and first-touch-lock logic that prevents acquisition source from being overwritten.

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Zero-Party Data & Quiz Funnels

Octane AI and Tally integrations. 35 scenarios. Conditional flow logic for profiling existing lists.

Unlike third-party cookie data, zero-party data is information a customer voluntarily gives you — quiz answers, preference selections, skin type inputs. When that data lives in Klaviyo as profile properties, it enables segmentation that behavioural data cannot. The conditional flow architecture that quietly profiles an existing subscriber list — checking whether a profile property is present, sending a quiz invite if it is not, and re-checking after 30 days — is built and documented here across 35 scenarios.

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Live ROI Calculators

Three tools built on 2026 benchmarks.

Enter your numbers. See what the channel is actually worth. Each calculator runs on real industry data — not generic estimates.

Brand's Instagram ROI Calculator

An Instagram audience engages with your brand's content every single day. Commenting, watching, reacting and then disappearing without a trace into the feed. This calculator takes your actual follower count, posting frequency, niche, and AOV and turns that engagement into a month by month projection of new Klaviyo profiles added, conversions generated, gross profit attributed, and total channel cost across worst case, typical, and best case scenarios. The brands that run this are rarely surprised by the best case. But moreover they are even more surprised by how much even the worst case outperforms doing nothing.

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Mobile Marketing Channel ROI Calculator

Five numbers. One answer. This calculator takes your current subscriber list size, send frequency, AOV, monthly support query volume, cost per support ticket and outputs a complete omni-channel intelligence report covering which omnichannel your brand should be on, what each channel will cost per message, what each channel will return per send, which flows benefit most from which channel, which segments respond best to which channel, and how each one integrates into your existing Klaviyo stack. The channel recommendation at the end is the part most brands screenshot and take into their next budget meeting.

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Quiz Funnel ROI Calculator

Most brands know that quiz completers convert better as they become warm leads from cold. Very few know by how much, across their specific list size, at their specific margins as the profiled audience compounds month on month. This calculator takes 7 parameters and runs a three-scenario audience progression report benchmarked against the data of 183,000+ brands in the Klaviyo 2026 Benchmark Report. Revenue estimations build month by month as more subscribers complete the quiz and enter personalised flows. The month 1 projection is a strong start. The month 6 and month 12 projections are the ones that change how a brand thinks about their entire retention strategy.

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Why Nikhil

Six reasons this hire is different.

Klaviyo Retention Specialist. 5× Certified. Available for full-time remote roles in DTC ecommerce retention marketing.

1

Two layers, not one

The interface level is where most retention specialists stop. The API and data layer underneath it is where revenue is actually protected. I work at both.

2

Computer Science Engineering

B.Tech CS Engineering. This is the foundation that makes the technical depth real. I can read API documentation, debug webhook payloads, and build Make.com pipelines without guesswork.

3

All five Klaviyo certifications. Every one verified.

Developer at 100%. Deliverability at 100%. Strategist, Practitioner, and Sales all passed. Every certificate links directly to Klaviyo's own verification page in the credentials section below.

4

Copywriting before Klaviyo

Two years writing DTC email copy at a boutique agency before two years inside Klaviyo. This background enables me to understand what the email needs to say, what Klaviyo needs to do and what the background data layer underneath it needs to reflect.

5

Omnichannel depth built from scratch

WhatsApp, RCS, Instagram, zero-party data quiz funnels. All four built from scratch and documented in full. A brand that wants to move beyond email and SMS already has that capability in this one hire.

6

Built for BFCM

A retention specialist who has documented beforehand what breaks under volume, why it breaks, and how to fix it is the hire who prevents revenue loss. Not the one who discovers it after Q4 is over.

The Work

Everything claimed here has a proof point.

Welcome Series

Petal Barrier — 5-Email Welcome Sequence

A 5-email welcome sequence built inside a live Klaviyo account. Includes a 50/50 conditional A/B split at Email 5 testing discount code versus free shipping. Email 3 is a pure founder story with no CTA and no product link. Full flow diagram included.

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Abandoned Cart

Petal Barrier — 3-Email Abandoned Cart Recovery

A 3-email abandoned cart flow with purchase-exit conditional splits after Email 1 and Email 2. Dynamic product block in Email 3. No discount until the final email. Full flow diagram included.

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GitHub

Technical Build Portfolio

Live Postman API diagnostic screenshots, Make.com automation builds, webhook architecture documentation, and Klaviyo flow exports.

View on GitHub →

1,000+ Connections. 50+ Posts.

1,000+ connections in the Klaviyo and DTC retention space. 50+ published posts covering API diagnostics, RCS for Business, WhatsApp marketing, Instagram automation, and zero-party data. I am the creator and the only person currently posting under the #KlaviyoRCS globally.

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Credentials

Verifiable. Not just claimed.

Every certification below links directly to Klaviyo's own verification page. Click any card to confirm.

Klaviyo Developer

100%

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Klaviyo Deliverability

Klaviyo Partner

resultninja.com · Partner verified

Open To

I am currently available for full-time remote roles in retention marketing, lifecycle marketing, CRM, and email marketing. Klaviyo-primary roles in DTC ecommerce are the primary focus.

Open to opportunities across the UK, US, Canada, Europe, and Australia. No relocation. Remote only.

If you are reviewing this as part of a job application, my resume and LinkedIn profile have the full picture. If you found this independently and want to discuss a role, my email below is the fastest route.

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Contact

The fastest way to reach me is directly.

nikhil@resultninja.com

I will respond within 24 hours.

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