Viacheslav Kostin
CEO WislaCode Solution
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See what we build, how we deliver, and why fintech teams work with us.
Boost digital engagement through professional, innovative client-side development. Make it fast, accessible, and easy to maintain.
At WislaCode, we create web frontend solutions that focus on users.
Our designs blend smooth functionality with strong visuals. Our services adapt to your business context, balancing modern technologies with clear objectives.
The result is user-focused applications that boost engagement, enhance performance, and promote sustainable growth. We achieve this without sacrificing accessibility, security, or maintainability.
Viacheslav Kostin
CEO WislaCode Solution
See what we build, how we deliver, and why fintech teams work with us.
Quality runs in CI: unit, integration and end‑to‑end tests, plus Lighthouse, visual regression and accessibility checks. In parallel, quick prototypes validate key journeys and copy to cut rework before build hardens.
A fitness club chain wanted to encourage self‑guided training with maximum accessibility.
We proposed a progressive web application and began with in-depth interviews and prototyping. Using JavaScript, TypeScript, React and Redux, we delivered the first release in four months and co-developed with the client’s team.
The result is a strong PWA that 81% of members use. It loads quickly, is easy to update, and works well for workouts both in and out of the gym.
Stable interfaces connect front ends to CMS, CRM, analytics, and payments. We prioritise idempotent APIs, versioning, and contract tests so changes land safely and rollout is predictable.
We test requirements such as routing complexity, form handling, state needs, team experience and performance targets. React with Next.js suits content-heavy or SEO-sensitive sites, Angular fits large, structured enterprise apps, Vue offers a gentle learning curve for rapid delivery. We also consider ecosystem maturity, accessibility practices and hiring availability to reduce long-term risk for your organisation.
We set explicit performance budgets, then design for Core Web Vitals. Techniques include code‑splitting, prefetching, server‑side rendering or static generation where useful, optimised images and fonts, and minimal third‑party scripts. We profile on real devices, monitor in production, and treat regressions as incidents. This keeps pages fast on typical networks, improving engagement and conversion.
From day one, we build in accessibility through semantic HTML, colour contrast, focus management, and keyboard navigation. We lint for a11y issues, run automated checks, then verify with manual screen reader and keyboard testing. Components in the design system ship with accessible patterns, reducing repetitive fixes. This approach meets WCAG 2.2 and lowers future remediation efforts.
Yes. We plan to migrate step by step. First, we’ll phase out old routes. Then, we’ll introduce a design system and replace modules one at a time. Where scale demands, we use micro‑frontends to isolate risk. Automated tests, visual regression checks, and performance budgets ensure each step improves quality. This approach shortens time to value while keeping the business running.
Absolutely. You can bring in senior front-end developers or a small squad (engineering, QA, UX) to accelerate delivery. We adopt your tooling and standards, set shared KPIs, and provide thorough documentation and knowledge transfer. This model helps you scale capacity quickly without losing internal ownership.
We support target browsers based on analytics and business requirements. Progressive enhancement, polyfills where necessary, and robust CSS strategies ensure graceful degradation. We test on real devices and emulators. We automate cross-browser suites and monitor client-side errors after launch. The result is predictable behaviour without over-engineering for edge cases you do not need.
We deliver code, infrastructure configs, CI/CD pipelines, design system documentation, and runbooks. Training sessions cover development workflows, accessibility practices, and performance monitoring. If you prefer, we provide ongoing support with SLAs. Otherwise, your team can take full ownership with confidence. This ensures continuity and reduces vendor lock-in.

20+ years of experience in managerial positions in IT and banking.

20+ years of experience as a developer, analyst, and solutions architect.
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