WislaCode

Web Frontend Development

Boost digital engagement through professional, innovative client-side development. Make it fast, accessible, and easy to maintain.

The Value of Professional Client-Side Development

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.

Core web technologies: We Build with modern, widely adopted stacks – HTML5, CSS/Sass, TypeScript, and component-based architectures. Patterns such as progressive enhancement, accessible semantics, and design tokens keep your web frontend development services maintainable, consistent, and future-ready across products and teams.
Responsiveness and accessibility by default: Mobile‑first layouts, fluid grids, and adaptive typography ensure great experiences on any screen. We design and test for WCAG 2.2, keyboard navigation, focus states, and assistive tech. This reduces rework, broadens reach, and supports enterprise accessibility commitments without compromising aesthetics.
Tools and frameworks we rely on: We select the right fit for your goals – React (with Next.js), Angular or Vue. Plus state management (Redux/RTK, NgRx, Pinia), testing (Jest, Playwright), linting/formatting and CI/CD. Our approach balances delivery speed with long-term sustainability, so your team can evolve confidently after launch.
Performance optimisation that matters: We set performance budgets and engineer for Core Web Vitals (LCP, CLS, INP): code-splitting, image optimisation, smart caching, SSR/ISR where helpful, and lean third-party usage. Continuous profiling on target devices keeps interfaces quick under real-world network conditions.
Core Capabilities in Frontend Development - WislaCode

Core Capabilities in Frontend Development

We work closely with your team to create user-friendly interfaces that match your brand and goals. Through iterative prototyping, usability testing and content modelling, we shape journeys that match user needs and deliver measurable outcomes.
We deliver clean, contemporary interfaces with mobile-first, responsive layouts. Design systems, consistent components, and thoughtful motion improve clarity and speed. We follow UX/UI best practices. This makes our products attractive, usable, and coherent.
We engineer consistent experiences across browsers, devices, and operating systems. Progressive enhancement, resilient fallbacks, and performance budgets ensure reliability. The codebase is also ready to expand into native and hybrid contexts when needed.
Fluid grids, adaptive typography, and optimised media create layouts that fit any screen. We focus on fast loading, readability, and stable rendering. We tune for Core Web Vitals like LCP, CLS, and INP. This keeps interfaces responsive and accessible.

Viacheslav Kostin
CEO WislaCode Solution

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See what we build, how we deliver, and why fintech teams work with us.

Hire a cost-effective team of developers

Management & Analytics

Cost of works management and analytics team
18-50
/man-hour
Project management
System analytics
Business analytics
The project team will be formed after the software development roadmap is approved.

Developers

Cost of works development team
22-65
/man-hour
Mobile app development (Android, iOS)
Backend software development (Java)
Frontend development (JS, React)
Database development
DevOps
The project team will be formed after the software development roadmap is approved.

UI/UX and Testing

Cost of works UI/UX and testing team
14-56
/man-hour
UI/UX design
Manual software testing
Automated software testing
The project team will be formed after the software development roadmap is approved.
We align on outcomes, KPIs, device/browser support and accessibility (WCAG 2.2 AA). We choose the rendering model (SSR/SSG/ISR/CSR), state and caching, then map API contracts and risks – producing a clear, shared roadmap.
Planning
Analysis

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.

Testing
UX Research
We ship a reusable design system (tokens, components) for consistent, fast UIs. Modular, type‑safe code (TypeScript with React/Vue), code‑splitting and a lean asset strategy keep pages quick, micro‑frontends only where they add real autonomy.
Design
Development
Canary/blue‑green releases with instant rollback via a hardened CI/CD pipeline. Real‑user monitoring, logs and traces from day one, runbooks and handover provided. We track SLOs and Core Web Vitals and optimise continuously.
Launch
Support
Case: From interviews to impact

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.

Why WislaCode?
We tie work to clear KPIs – conversion, task completion, and Core Web Vitals. Dashboards, performance budgets, and UX benchmarks show progress every sprint, aligning stakeholders and accelerating decisions.
Outcomes you can measure

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.

Integration without friction
We implement security headers, input validation, dependency scanning, and least-privilege APIs. Error handling, logging, and SLOs ensure reliability at scale, while release practices minimise risk during peak periods.
Secure and dependable by design
Design systems, reusable components, and modular architecture (micro‑frontends where warranted) let you expand features and teams without slowing delivery. Documentation and handover enable your developers to own the roadmap.
Built to evolve, not be rewritten

FAQ About Web Frontend Development

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.

Viacheslav Kostin

Viacheslav Kostin, CEO

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

Viacheslav Kostin, CEO
Previous roles: CEO in IT, Director of Strategy and Marketing in Banking, Curator of Holding Banks, Head of Products and Project Office.
Education: MBA for Executives at IMD (Switzerland), Leading Digital Business Transformation (IMD). Provides consulting in strategy and digital transformation.

Pahomov

Vasil Pahomov, CTO

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

Vasil Pahomov, CTO
Designs resilient, high-load systems with multiple integrations for banks and financial institutions. Expertise in distributed storage and microservices architecture.
Book a Call
Let's discuss your project's evolution.
Book a Call
Let's discuss your project's evolution.

Management & Analytics

Cost of works management and analytics team
18-50
/man-hour
Project management
System analytics
Business analytics
The project team will be formed after the software development roadmap is approved.

Developers

Cost of works development team
22-65
/man-hour
Mobile app development (Android, iOS)
Backend software development (Java)
Frontend development (JS, React)
Database development
DevOps
The project team will be formed after the software development roadmap is approved.

UI/UX and Testing

Cost of works UI/UX and testing team
14-56
/man-hour
UI/UX design
Manual software testing
Automated software testing
The project team will be formed after the software development roadmap is approved.
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