tomasz zastawny

B2B SaaS for Calastone, the transaction network the global funds industry runs on, used by fund operations teams at end clients including HSBC, Federated Hermes, and Allspring.

• sole designer on ETF Servicing since late 2022, and moved into the lead designer role on Money Market Services after it started in 2024, owning design decisions across a stakeholder group of PMs, product owners, business analysts, product directors, and engineering.
• drove a rebuild of the design system behind both products instead of forking it: a Figma variable and token architecture carried into the Angular build through per brand config, taking 6 brand tenants to zero forked libraries and reducing a new tenant launch to a token change.
• mapped the domain before any UI existed, with flow charts, BPMN, and process diagrams, then designed the primary ETF create and redeem workflow HSBC uses across management entities in Europe and Asia: order capture, pricing, settlement, and registry reconciliation against depositories including TA2000.
• designed four eyes approval by running working sessions with client operations teams on how approvals actually moved in their firms, then iterating review states until they matched; the client signed off the final process.
• crafted high fidelity UI for the order detail view, the product's core operating surface: charge amendments, prefunding and settlement dates, and a full audit log, dense enough for expert operators, still legible, and forgiving of mistakes.
• delivered WCAG 2.1 AA across the shared design system ahead of the April 2026 ADA Title II deadline, testing every component with an accessibility specialist engineer: keyboard navigation, WAVE, and NVDA screen reader passes before sign off.
• drove new work on Money Market Services including the bulk multi trading flow, an inline form table for large trade batches; met AA on keyboard, ARIA, contrast, and font scale, documented the screen reader gap as an explicit tradeoff, and put it on the roadmap.

consumer and B2B fintech in Nigeria, through several pivots. Sole designer at first, later directing a small brand and motion team.

• built a design foundation that bent with the strategy through every pivot: colour, typography, iconography, imagery tiers, and a component set that became the substrate for the shipped Juicyway platform, whose customers include Bolt, Technogym, and Nigerian Breweries.
• held core navigation and interaction patterns stable through each pivot, so returning users never had to relearn the product when it changed shape.
• moved into art direction as the brand and motion team formed, setting creative direction, running design reviews, and translating the CEO's vision into what the product shipped
• shipped across web dashboards, web apps, and Flutter mobile, embedding in backend standups so product and UX decisions fed directly into build scope.

external product designer embedded in client teams. Main engagement: Bamboo (Jan 2020 - Aug 2021), a mobile investing app letting Nigerian users buy US stocks, mutual funds, and fractional shares with dollars converted from naira.

• ran a discovery phase the engagement had no budget for, producing personas, user stories, and competitor analysis with support from the client's UX researcher, which became the basis for the product roadmap.
• launched Bamboo on iOS and Android as sole product designer, covering the full product surface: mobile apps, web app, internal admin panels, and marketing site, roughly 500 artboards, and working through implementation on interactions, gestures, and animations.
• rebuilt onboarding with KYC, identity verification, bank linking, and source of funds as the spine of the flow rather than an obstacle added on top, for users new to investing.
• built the case for the one year redesign by pairing the client's external UX audit with an independent UI audit and customer support signals, writing a screen by screen proposal and presenting key screens for client sign off; shipped a new brand, dark mode, and rebuilt data visualisation.
• designed for the low specification Android hardware common in the market, simplifying data visualisation so one chart read for both novice and expert investors.
• additional engagements: Helium Health (Y Combinator backed Nigerian health tech), DrOnline (US and UAE health tech), DoubleMap (US transportation).