Taras Oliinyk — Marketplace & Platform Product Design

The handoff is where most products die.Design finishes, the files go over the wall, and three weeks later what's on staging isn't what was approved. Nobody lied — the developer hit a case the design didn't cover, made a reasonable call, and moved on. Multiply that by two hundred decisions and you have a product that works but doesn't feel like the one you signed off on.Running two vendors makes it worse, because now there's a seam to manage and two people who can each point at the other.We don't hand off. Design and engineering sit in the same team, in the same weekly cycle, so edge cases get resolved once — by the two people who both own the outcome — instead of being discovered twice.In two months you get a working product, not a prototype: designed, built, tested and deployed, with the code and the design files yours to keep.How it runs:— Week 1–2: discovery, flows, architecture and scope locked together by design and engineering, so nothing is specified that can't be built in the timeline— Week 3–5: design and build in parallel, weekly working builds you can click, not screenshots— Week 6–8: edge cases, states, QA, performance, deployment and handoverWhat you get:— Full UX and UI in Figma, with a component library— Production frontend, built against that library— Backend and API work, or integration with your existing stack— Admin and operator tooling— Responsive web, plus mobile app where the product needs it— Testing, deployment and documentation— Your code, your repos, your design filesTypical engagements: MVP design and development, marketplace and multi-vendor platform build, SaaS product design and development, B2B platform launch, fintech and payments product build, internal tools and admin systems, web app development, product rebuild and re-platforming, design-to-code delivery.We work as one team at U1CORE — design and engineering together, so what gets approved is what gets shipped. Platforms in this portfolio have processed $720M+ in production payments across classified marketplaces, trading exchanges, auction systems and B2B commerce.

A marketplace is not an online store with more sellers. It's two products that have to be designed against each other.The buyer side needs everything to look effortless: search that understands a vague query, listings that answer the question before it's asked, enough signal to trust a stranger with money. The seller side needs the opposite — speed, bulk actions, and a listing flow that doesn't take twenty minutes for item number forty.Design one side well and the other collapses. Beautiful buyer experience with a painful seller flow means an empty catalogue.Efficient seller tools with a confusing buyer path means listings nobody converts on. And behind both, someone on your team has to resolve a dispute, suspend a fraudulent account and check why yesterday's GMV dropped — usually in an admin panel that was designed last and fastest.In four weeks you get all three surfaces designed as one product: buyer, seller and operator, built from the same system, with the same vocabulary, and specified so your developers can build without guessing.What we design:— Seller onboarding, verification and listing creation, including bulk and repeat flows— Seller dashboard: inventory, orders, payouts, performance— Buyer discovery: homepage, category browse, search, filters, sorting, empty and zero-result states— Listing and product pages, with the trust signals that decide the transaction— Cart, checkout, payment and order tracking— Reviews, ratings, messaging and dispute flows— Admin and operations console: moderation, user management, fraud flags, transaction oversight, analytics— Responsive web and mobile app screens where the model requires bothYou get: full UX flows, wireframes, high-fidelity UI in Figma, a component library, all interaction states, and a developer-ready handoff.Typical engagements: multi-vendor marketplace design, B2B marketplace and procurement platforms, C2C resale and pre-owned marketplaces, rental and booking platforms, auction and bidding systems, service marketplaces, classified listings with large catalogues, real estate and automotive platforms, e-commerce platform redesign.Work runs as part of U1CORE — design and engineering in one team, so what gets approved is what gets shipped. Platforms in this portfolio have processed $720M+ in production payments — classified marketplaces with millions of listings, trading exchanges, auction systems and B2B commerce.

A multi-sided platform doesn't have one product. It has three, and they drift apart.The buyer app gets designed first and looks sharp. The seller side gets built under deadline and borrows half of it. The admin panel gets whatever was left. Two years in, the same table has four behaviours, a "pending" state means something different on each side, and nobody can add a screen without opening three files to check how the last person did it.That isn't a tidiness problem. It's the reason every new feature takes longer than the last one, and the reason support keeps explaining that the seller sees a different status than the buyer.Single-product design systems don't fix this, because they assume one audience and one density. A platform system has to carry a consumer-grade buyer surface and an information-dense operator console without splitting into two libraries that slowly diverge.In three weeks you get one system that all three sides are built from — tokens, components, states and the rules for when to use which — delivered in Figma and specified so developers can build against it.What you get:— Audit of what exists across buyer, seller and admin, with the duplications and conflicts listed— Design tokens: colour, typography, spacing, elevation, radius, with light and dark themes— Core component library: buttons, forms, inputs, selects, navigation, modals, toasts, empty and error states— Platform-specific components: data tables with sorting, filtering and bulk actions, listing and product cards, status and role badges, permission-aware layouts, transaction and order states— Density rules: how the same component behaves on a buyer screen and inside an operator console— Shared status vocabulary so both sides of the market see the same thing named the same way— Usage documentation, naming conventions and contribution rules— Figma library with variants, auto-layout and variables, plus a developer handoff specTypical engagements: marketplace design system, multi-vendor and B2B marketplace UI library, SaaS platform component library, seller and buyer app consistency, admin panel and operator console systems, Figma library rebuild, design token migration, design-to-code handoff.Work runs as part of U1CORE — design and engineering in one team, so the system is specified against what actually gets built, not against an ideal. Platforms in this portfolio have processed $720M+ in production payments.

Most platform founders don't need more ideas. They need someone to tell them which three to drop.The backlog has forty items. Investors want growth, the team wants refactoring, and the two loudest customers want opposite things.Every item is defensible on its own, which is exactly the problem — nothing in the list tells you what order to do them in, and amarketplace built in the wrong order stays empty regardless of how good each piece is.Two-sided and multi-sided platforms have a fixed sequence: supply before demand, liquidity before conversion, conversion before retention. Most roadmaps break that sequence somewhere, and the cost isn't a bad feature — it's a quarter.In two weeks you get a decision, not a deck: the sequence written down, defended with evidence, and specific enough that your team can start on Monday.Week one — I go through your platform the way both sides of your market do, read your funnel and retention numbers, review three to five competitors in your category, and interview your team and, where possible, two of your sellers and two of your buyers.Week two — two working sessions with you, then the written strategy.What we work through:— Where your platform actually is: supply, demand or retention— The marketplace model you're in, and what that model requires— Pricing, take rate and the incentive it creates on both sides— Seller onboarding and time-to-first-listing— Buyer discovery, search, trust signals and conversion— The roadmap, reordered — with what to cut named explicitly— Build vs buy, and where design and engineering effort goes firstYou get:— Written product strategy with a sequenced quarter-by-quarter roadmap— The bottleneck named, with the evidence behind the call— Competitor review of 3–5 players in your category— A "not now" list: what to stop working on, and why— Two 90-minute working sessions, plus a follow-up thread as you put it into motionTypical engagements: marketplace strategy, two-sided and multi-sided platform design, B2B marketplace and multi-vendor planning, SaaS platform roadmap, MVP scoping for platform startups, rental, auction and licensing marketplace models, e-commerce platform growth, product discovery and UX audit follow-on.I'm founder at U1CORE — design and engineering in one team. I've made these calls on my own platforms and on clients'. Platforms in this portfolio have processed $720M+ in production payments — classified marketplaces with millions of listings, trading exchanges, auction systems and B2B commerce.

A marketplace or platform that isn't growing usually has no single broken screen. It has a loop that doesn't close.Supply signs up and never lists. Buyers browse and don't commit.The ones who do transact don't come back, and nobody inside the company can say which of those three is the actual constraint — so the roadmap gets split three ways and none of them moves.Two-sided and multi-sided platforms fail in a specific order, and the order matters: liquidity before conversion, conversion before retention. Fixing checkout UX on a marketplace with no supply is expensive work that changes nothing.In one week you get a diagnosis of which side of the loop is the bottleneck, what it costs you, and a sequenced plan — what to fix first, second, and what to deliberately leave alone this quarter.I run a full marketplace UX audit and platform UX audit across both sides of the market: seller onboarding and time-to-first-listing, listing quality and catalog completeness, buyer discovery, marketplace search and filtering, trust signals, ratings and reviews, the path from intent to checkout, repeat behaviour on supply and demand side, and the admin panel and operator dashboard your team runs it with.What you get:— The bottleneck named, with the evidence behind the call— Annotated UX walkthrough of both sides plus the admin panel— Ranked fix list, sequenced by what unblocks what— What NOT to build this quarter, and why— Written audit document plus a 60-minute product strategy callTypical engagements: B2B marketplace design, multi-vendor platform UX, two-sided marketplace strategy, SaaS platform audit, e-commerce marketplace conversion, auction and rental platform UX, classified marketplace search and discovery, seller admin and operator tooling.Work runs as part of U1CORE — product design and engineering in one team, so the plan comes with a realistic view of what it takes to build. Platforms in this portfolio have processed $720M+ in production payments.

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