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Seller7.ai
Platform · Multi-marketplace Seller OS
A complete operating system for modern ecommerce sellers — orders, shipping, reimbursements, reviews, finance and warehouse ops across 20+ marketplaces, unified in one AI-powered workspace.
Since 2017Trusted ecommerce software engineering partner
Your custom ecommerce software development partner.
For 8+ years we’ve shipped production-grade Amazon SP-API, Advertising API, Walmart, eBay and Shopify tools for 7-figure sellers, agencies and aggregators. Clean code you own forever, AI built-in where it saves your team real hours — no more subscribing to a stack of SaaS dashboards to do one job.
AI-first ecommerce software solutions — built to bring you the best.
Every marketplaceSP-API · Walmart · eBay · Shopify
8+ yrsSP-API in production
50+Tools shipped
100%Client-owned code
We integrate with
Amazon · SP-API + Ads
Walmart · Marketplace
eBay
Shopify
TikTok · Shop
Etsy
Target · Target+
Google Ads
Meta Ads
Stripe
QuickBooks
OpenAI
Anthropic
Amazon · SP-API + AdsWalmart · MarketplaceeBayShopifyTikTok · ShopEtsyTarget · Target+Google AdsMeta AdsStripeQuickBooksOpenAIAnthropic100+ teams shipping real products have trusted us to build their software — client-owned tools, internal ops systems & SaaS products
The Problem
Your SaaS stack is bleeding you.
Every month you pay 15+ SaaS vendors for software that doesn't talk to itself. Every request gets in a queue behind 10,000 other customers. Every feature is for the median user — not you.
Monthly SaaS BillAVG 7-FIGURE AMAZON SELLER · 2026
Helium 10 · Diamond$229
Jungle Scout · Suite$149
Sellerboard$29
Perpetua$550
Intentwise$300
DataHawk$150
Sellozo$149
Teikametrics$500
+ 7 more (QBO, Klaviyo, helpdesk, 3PL…)…
TOTAL / MO$2,056
TOTAL / YR$24,672
* and nothing talks to each other
After build
Your Custom Tool · $0/mo
You own the repo. You own the data. You own the roadmap.
$25K+/year on tools that don’t talk
Eight subscriptions, zero integration. Your data is copy-pasted between 4 tabs.
Your data locked in 8 dashboards
You pay monthly to access your own numbers. Export limits, API caps, CSV hell.
Custom feature? File a ticket. Wait 6 months.
Generic SaaS can't ship for your ops because it isn't built for your ops.
Scaling = more seats, not more capability
Every new brand, every new hire — another bill, not another advantage.
Stop the bleeding — book a 15-min call 15 min · no pitch deck · we map your stack live
Who we build for
Built for four kinds of ecommerce operators.
Sellers, agencies, aggregators, SaaS founders. Find your fit below — every tool we build starts from your stack, your workflow and the bottleneck you're actually trying to fix.
7–8 figure sellers
Multi-marketplace sellers
You've outgrown Helium 10. You need ops intelligence, not another dashboard — the internal tool your team opens every morning.
See relevant workAgencies & consultancies
Ship insight, not another login
Stop handing over one more SaaS seat. Deliver your methodology as a branded tool that keeps clients on longer.
See relevant workAggregators & global brands
Run 20+ brands across countries
Plan cross-border shipping, consolidate SP-API across US / EU / UK / JP marketplaces, and run every brand in your portfolio from one operating system.
See relevant workSaaS founders
Ship your MVP on 8 years of SP-API
You have the idea. We have production SP-API, Advertising API and AI-agent experience. Launch in weeks, not quarters.
See relevant workRecently launched
Check out our portfolio.
Our five most recent builds — a multi-marketplace Seller OS, two agent-powered AI tools, a 100M-product global-commerce platform, and an AI margin-intelligence engine. Each one replaced a stack of 4–8 SaaS subscriptions and is still running, owned and operated by the client.
Most of our recent work lives under NDA. What you see above is only a slice. Hop on a call and we'll share our screen — live, no recordings — and walk you through the dashboards we have permission to demo.
Schedule a call AI Agents · Automations
Beyond dashboards — we also build the ecommerce AI agents that run your ops.
Not just software you log into. Self-driving automations that monitor, decide and act across Amazon SP-API, Advertising API, Walmart, Shopify and your back-office — replacing the “someone has to check this daily” seats on your org chart.
Listing Agent
Audits ASINs, rewrites titles, bullets and A+ copy, regenerates lifestyle imagery, and pushes everything back to Seller Central — on a schedule you control.
Ads Agent
Watches PPC 24/7, adjusts bids and budgets against a margin-aware ROAS target, kills wasted spend and flags cannibalization before it hits your P&L.
Reimbursement Agent
Detects FBA losses, damaged and lost inventory, overcharged fees and returns fraud — files the claims automatically and tracks recovery to the dollar.
Catalog & Pricing Agent
Syncs stock, pricing and content across Amazon, Walmart, Shopify, eBay, TikTok and 15+ other marketplaces — with per-channel rules and branding.
Review & Support Agent
Drafts and posts on-brand review replies, answers buyer messages, and routes the hard ones to a human — trained on your tone and your policies.
Reporting Agent
Assembles weekly P&L, ad-spend deltas and ops anomalies into a clean briefing delivered to Slack, email or a dashboard — no analyst, no copy-paste.
Why teams pick us
Custom software, shipped in 4 weeks — not 4 quarters.
Two reasons our delivery beats every agency quote you're comparing us to: deep ecommerce domain expertise since 2017, and AI-native engineering. Your build isn't an R&D experiment — it's week-one execution.
50+
Custom tools shipped for sellers, agencies and aggregators
8 yrs
SP-API + Advertising API in production (since MWS)
$24K
Average SaaS spend eliminated per client, per year
4 wk
Typical time from scoped MVP to production-ready build
Ecommerce in our DNA
Since 2017 we've lived inside Amazon SP-API, Advertising API, Walmart, eBay and Shopify. No discovery tax, no API misreads — we skip the ramp-up every other shop bills you for.
We code with AI
Our senior engineers pair with Claude and Cursor to auto-generate boilerplate, tests and data wiring — so human hours go to the tricky 20% that actually moves your P&L.
How we work
A 4-step build. No surprises.
You'll know the architecture, the price and the timeline before we write a line of code. Weekly demos, staging access, and a clean hand-off at the end.
0115 min
Fit call
15 minutes. We map your ops, your current stack, and what it would cost to own it instead.
021–2 weeks
Scope & architecture
A written 1–2 week architecture doc: data model, API surface, AI agents, timeline and a fixed price.
032–6 weeks
Build in sprints
You see demos every Friday. We ship to your staging, you stress-test with real data, we iterate.
04Day 1
Launch & own it
You get the repo, the infra, the docs. We stay on as long as you want — or hand off cleanly.
Client stories
What our customers are saying.
On-camera stories from the sellers, agencies and tool-builders we've partnered with — plus a few kind words from the inbox.
Ecomsellertool rebuilt our entire ops stack on React + Python with direct SP-API and Advertising API integration. We killed five subscriptions, cut report prep from 2 days to 10 minutes, and the dashboards look better than anything we were paying for.
Great job! We were very pleased with Ecomsellertool's work and would highly recommend them for detail-oriented projects. Always available, always on follow-through. Will definitely rehire.
Solid communicator and extremely knowledgeable team. They walked me through every piece of Amazon's SP system with patience. Anyone who appreciates honesty and clear communication should hire them.
Perfect experience! Love working with Ecomsellertool and his team.
FAQ
Answers, before you book the call.
The questions sellers, agencies and aggregators ask us most often. Something missing? Hop on a 15-min call and we’ll answer it on screen.
How long does a typical project take?
A scoped MVP usually ships in ~4 weeks, and most full production builds land in 6–8 weeks. We commit to a fixed timeline and a fixed price in the architecture doc — so you always know what you're getting, and when.What kinds of tools do you actually build?
Internal ops software for ecommerce teams. Common builds include:- Global cross-border shipping & fulfillment planners
- Multi-marketplace order management (Amazon, Walmart, eBay, Shopify)
- Payments & settlement reconciliation
- Listing optimizers & bulk content managers
- Inventory replenishment & demand forecasting
- Inventory reconciliation (in-transit, 3PL, FBA)
- PPC automation & bid-management dashboards
- SP-API + Advertising API data warehouses
- Profitability & P&L dashboards by SKU / brand / country
- Vendor Central & retail analytics tools
- Returns, refunds & reimbursement claim automation
- AI copilots & agents plugged into your ops stack
What does engagement with you look like?
A fixed-scope build — not an open-ended retainer. We start with a 15-minute fit call, follow it with a 1–2 week architecture doc (data model, API surface, AI agents, timeline, fixed price), then ship in weekly sprints with Friday demos on your staging. At hand-off you own the repo, infra and docs. We can stay on for managed maintenance if you want — or you walk away clean.Who owns the code, the data and the infrastructure?
You do. Every project ships to your GitHub, your AWS/GCP account and your database — under your NDA if you need one. There's no seat-based lock-in, no data held hostage, no “export limits”. This is the exact opposite of renting SaaS.Do you work with SP-API, Advertising API and the other ecommerce APIs?
Yes — it's our core domain since 2017. We build in production on Amazon SP-API (ex-MWS), Amazon Advertising API, Vendor Central, Walmart Marketplace, eBay, Shopify, Stripe and QuickBooks — plus most 3PL and ERP APIs our clients use. No discovery tax on your project.
Next step
Done stacking SaaS subscriptions? Let’s build a tool tailored to your ops.
A 15-minute fit call. No pitch deck. We map your ops, your current SaaS spend, and the tailored tool we could ship to replace it — typically in 4 weeks, not 4 quarters.
No NDA required Scope + quote in 1 week You own the repo