Viacheslav Kostin
CEO WislaCode Solution
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Mobile App Development
WislaCode offers end‑to‑end mobile app development services, covering everything from design and integration to ongoing management.
Mobile app solutions we implement
Consolidated journeys for delivery, shopping, transport, payments and more – designed as modular domains with shared identity, wallets and notifications.
Platform‑specific builds for iOS and Android, leveraging device capabilities for responsiveness, accessibility and secure storage.
Consistent functionality and performance across devices, with careful use of shared code and native modules where needed.
Near‑native experiences delivered via the web, combining installability, offline support and rapid iteration.
Engagement‑led experiences engineered for longevity, with Swift, modern architectures and strong release automation.
Kotlin‑based apps that balance visual quality with reliability, designed to scale across devices and markets.
Refactoring legacy code, modularising features, migrating data and services, and strengthening CI/CD and observability for sustainable evolution.
Development of mobile applications
Our approach delivers robust, maintainable apps for iOS, Android and the web, following a structured, collaborative process.
From discovery and UX/UI to engineering, rigorous testing and ongoing support, we align the build to your business objectives and operating constraints – so the result works reliably in production and within your estate.
Product strategy and discovery
We align the mobile vision with measurable outcomes. Through user and stakeholder research, journey mapping, technical feasibility and backlog shaping, we establish a validated roadmap that reduces risk and accelerates value.
Experience design
We craft accessible, intuitive interfaces using platform conventions (Human Interface Guidelines, Material Design). Design tokens and reusable components enable cohesive experiences, efficient hand‑offs and scalable multi‑app portfolios.
Secure, scalable back ends and integrations
We deliver API‑first services, identity and payment integrations, offline‑first data sync and end‑to‑end observability. Security hardening and privacy by design support compliance (including GDPR) without compromising UX.
Native and cross‑platform engineering
We select the right approach for your context – native (Swift, Kotlin) or cross‑platform (Flutter, React Native, Kotlin Multiplatform). The outcome is consistent UX, strong performance and faster iteration, with codebases engineered for maintainability.
Quality engineering
We implement automated tests across devices and OS versions, robust CI/CD pipelines and release governance. Functional and UI testing, performance profiling and security checks keep builds stable and predictable.
Optimisation, analytics and post‑launch growth
We monitor real‑world performance and behaviour to inform the roadmap. App Store optimisation, A/B testing and targeted improvements sustain retention, improve ratings and lower total cost of ownership.
How we deliver mobile apps?
Our mobile application development services begin with an in‑depth analysis of your business to align app functionalities with your strategic goals.
Planning
Analysis
At WislaCode, we prioritise quality. Our process includes comprehensive testing to guarantee functionality, usability, performance, and security.
Testing
UX Research
We build scalable applications with a microservices architecture, ensuring your app can grow with your business.
Design
Development
We ensure that your mobile app is resilient, reliable, and prepared for scaling.
Launch
Support
Case: from banking app to digital banking super app
Working with a retail bank, we redesigned core journeys and implemented native foundations in Kotlin (Android) and Swift (iOS).
In six months we shipped the first release with remote onboarding, seamless payments and in‑app servicing.
Adoption now exceeds 700,000 customers. The programme mixed smart UX, strong security, and careful delivery. It was carried out within the bank’s infrastructure and rules. This was a custom build, not an off‑the‑shelf product.
Why WislaCode?
We link decisions to measurable results – acquisition, activation, retention, conversion and cost to serve. Tight feedback loops and iterative releases reduce risk and accelerate ROI.
Outcome‑driven delivery
We stay engaged after go‑live: analytics‑led optimisation, store health management and continuous enhancements that lift retention and ratings while controlling total cost of ownership.
Post‑launch partnering
From native to cross‑platform and API‑first back ends, we recommend the simplest approach that meets performance, budget and time‑to‑market constraints and implement it with clean, maintainable code.
Engineering depth
Testing, observability and security hardening are integral. Automated checks across devices, robust pipelines and secure coding practices keep releases stable and compliant.
Built‑in quality
FAQ About App Development
Choosing between native and cross‑platform depends on your goals, timelines, and constraints. Native (Swift, Kotlin) provides top performance and full access to device features. It offers a smooth, platform-specific experience. This makes it perfect for complex interactions, demanding animations, or the latest OS API features. Cross‑platform (Flutter, React Native, Kotlin Multiplatform) reduces duplicated work and can shorten time‑to‑market while maintaining a high‑quality user experience. For many products, a cross‑platform core with selective native modules balances velocity and performance. We start with your use cases, roadmap, and budget, then recommend the leanest approach that meets your risk profile. Whatever you choose, our pipelines, automated tests, and observability keep releases stable and predictable across iOS and Android.
We combine layered testing with real‑device coverage. Unit and integration tests protect business logic. UI tests validate user flows, snapshot and visual checks guard against regressions. We run suites on device farms covering popular iPhone models, Android OEMs, screen sizes, and OS versions. Performance budgets catch slow start‑up, jank, memory issues, and network bottlenecks before release. Security scanning and dependency audits reduce supply‑chain risk. Everything runs through CI/CD with gating rules, so only builds that meet quality thresholds progress to beta and production tracks. Post‑release, crash analytics, logs, and traces surface issues fast, enabling rapid fixes without disrupting the roadmap.
Security is embedded from discovery to release. We apply threat modelling, secure storage for sensitive data, and strong authentication and session management. Network traffic is encrypted. Certificate pinning is used when needed, and secrets are kept outside the app. We minimise data collection, implement privacy by design, and support user consent flows. Static and dynamic analysis, SCA (dependency) scanning, and secure code reviews reduce vulnerabilities before they ship. For regulated sectors, we align with your compliance needs (including GDPR) and document controls for audits. Post‑launch, monitoring and alerting help us respond quickly to emerging risks.
Time-to-market depends on:
- Scope clarity
- Design readiness
- Platform choices
- Integration complexity
- Non-functional needs, such as performance and security.
A clear MVP with specific user journeys can launch fast, especially when cross-platform works well. Complex back‑end integrations, payments, identity, or heavy offline use usually add effort. We de‑risk delivery with discovery workshops, design systems, and automation in testing and deployment. Incremental releases get value to users earlier, collect real feedback, and guide prioritisation. We launched the first version of a banking app in six months. We did this by aligning the scope, setting up pipelines, and making decisions quickly.
We agree measurable outcomes before we write code. After launch, we monitor activation, key task completion, retention, session quality, and performance metrics like startup time and frame stability. We also check store signals, including ratings and reviews. Analytics and event taxonomy are defined up front, so insights are reliable. We pair quantitative data with user feedback to form hypotheses, A/B test improvements, and iterate safely. Crash‑free sessions and error budgets keep technical health visible. This approach makes sure roadmap decisions rely on evidence. This boosts user satisfaction, cuts support costs, and raises lifetime value.
Yes. Modernisation often delivers better ROI than a rewrite. We begin with a technical audit to map performance hotspots, architectural constraints, and UX friction. Targeted refactoring, introducing a design system, improving state management, and adding automated tests can stabilise delivery quickly. Where beneficial, we extract modules into a more maintainable architecture, improve build times, and harden security. If migration to a different framework or a clean architecture is justified, we plan it incrementally to avoid long pauses in feature delivery. The goal is to improve reliability, performance, and developer velocity while protecting existing users.
We handle end‑to‑end release management: provisioning, signing, beta distribution (TestFlight, Play Console), compliance checks, and store metadata. Our pipelines automate build versioning, changelogs, and staged rollouts to limit risk. We follow platform guidelines, accessibility requirements, and content policies to reduce review rejections. Post‑approval, phased releases and monitoring let us detect anomalies early and pause or roll back if necessary. We also manage store presence – keywords, screenshots, and A/B testing. To improve discoverability and conversion without compromising brand consistency.
Support combines proactive monitoring with clear SLAs. We track crashes, performance, API errors, and key user flows, with alerts for threshold breaches. Triage routes issues to the right owners, and hotfix paths are pre‑agreed to minimise downtime. We schedule dependency and OS updates, manage deprecations, and keep pipelines current. Regular health reviews align product goals with technical priorities, ensuring sustainable delivery. Alongside bug fixes, we propose data‑informed enhancements that lift retention and ratings over time.
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.
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.