Viacheslav Kostin
CEO WislaCode Solution
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See what we build, how we deliver, and why fintech teams work with us.
Software Development Services
We design and deliver custom software that fits your organisation — not the other way around. Our teams modernise legacy estates, integrate with ERP/CRM and payment systems, and build secure, scalable platforms that reduce cost to serve and accelerate delivery. Engagements focus on outcomes, are shipped in increments, and allow full observability.
Enterprise software development solutions
We engineer enterprise‑grade applications that digitise core processes end-to-end. API‑first integration, strong governance and microservices where they add value ensure interoperability, resilience and future-proof scaling without vendor lock-in.
Building robust, scalable software
From greenfield builds to application modernisation, we engineer for scale and maintainability. Patterns include event-driven architecture, containerised workloads, caching and observability (metrics, logs, traces). Security and privacy are embedded throughout the lifecycle.
Digital Enterprise Modernisation: We re-platform key workflows, add domain-driven services, and swap fragile point-to-point links for stable contracts. Expect cleaner data, clearer ownership and faster releases as your estate evolves.
Commerce and payments: We implement catalogue, pricing, basket, checkout and subscription flows with rigorous auditing. Payment provider integration, tax handling and dispute/dunning tools are designed for reliability and rapid iteration.
Customer experience engineering: We craft accessible, high-performing journeys for web and mobile. Design systems, personalisation, and service patterns make onboarding, self-service, and support easier. This boosts satisfaction and reduces operational effort.
Data analytics and decisioning: We build governed pipelines, near‑real‑time dashboards and forecasting models. Teams get trustworthy KPIs and cohort insights that inform planning, optimisation and performance management.
Competitive products and platforms
Financial analytics for fintech teams to process large datasets, track performance and improve customer service – delivered as secure, role‑based apps.
Custom enterprise software with modular capabilities to digitise back-office and front-office operations, aligned to SLAs and governance.
End-to-end billing and payment workflows with transaction tracking and detailed reporting – built for multi-device continuity.
Leasing and field-operations apps for equipment and automotive finance – improving turnaround times, accuracy and compliance.
User-friendly systems for payments, KYC/AML and servicing – enhancing internal and customer-facing interactions.
Digital banking capabilities for retail and commercial contexts – core integration, personalisation and reporting.
Automated origination, pricing, invoicing and end-of-term flows for lenders and lessors.
We align goals, constraints and success metrics. Define scope, architecture options and a staged roadmap.
Planning
Analysis
Automated tests across layers, accessibility checks and performance profiling ensure reliability before release.
Testing
UX Research
We implement modular services and interfaces, prioritising interoperability, accessibility and performance.
Design
Development
CI/CD, feature flags and runbooks enable safe, frequent releases. We provide post-launch optimisation and knowledge transfer.
Launch
Support
Case: Digitised car leasing cuts contact‑centre workload by 68%
A leasing provider needed to escape phone‑and‑email bottlenecks.
We delivered a user account, a dealer portal and deep integration with internal systems – covering search and booking, applications, contracts, invoicing and document management. Routine queries were automated, approvals accelerated and funnel analytics made visible.
Result: A 68% reduction in contact‑centre and staff workload, measurable savings and a scalable foundation for future features.
Why WislaCode?
We tie work to measurable results – time to value, conversion, throughput and cost to serve. Short, evidence‑based increments de-risk change.
Outcome‑driven delivery
API‑first patterns and adapters connect to ERP/CRM, payment systems and legacy systems. We preserve data integrity and avoid brittle point‑to‑point links.
Integrations
Secure SDLC, CI/CD, automated testing and observability come as standard. Versioned artefacts, audit trails and rollback plans keep releases predictable.
Engineering
Modular and, where appropriate, microservices architectures support future features and partner integrations – without costly rewrites.
Built to scale
Some Customer Reviews
WislaCode developers are dedicated to each project. They work hard to deliver results quickly.
Aleksei Malenkin, $lana (Monetech)
5
WislaCode specialists quickly synchronised and worked with the second team involved in developing our solution.
As a result, having started development from scratch, we came to the expected result quickly. The first users went to the application after 5 months.
Read the full review
FAQ About Software Development
Off‑the‑shelf tools are faster to start but force process compromises and create integration gaps. Bespoke delivery aligns to your workflows, data and security controls, reducing manual work and long-term licence drag. We often blend both: a core custom layer with targeted products where they excel, stitched together via stable APIs.
We assess architecture fitness, technical debt, run costs and change velocity. If targeted refactoring can meet roadmap goals, we modernise in place – improving performance, reliability and security. If constraints are structural, we stage a rebuild around well-defined boundaries, preserving data and business logic while avoiding a big‑bang cut-over.
Yes. We define explicit API contracts, versioning and idempotent behaviours. For older systems we use adapters to normalise data and manage errors. Event streaming decouples services, while observability highlights latency or failure hot-spots before customers notice.
Scope varies, but we target a first value slice in 6–12 weeks: one or two high-impact journeys wired end-to-end, instrumented with metrics and feedback loops. Subsequent iterations expand coverage, refine UX and improve performance based on real usage data.
Security is built in: threat modelling, dependency scanning, secrets management and environment hardening. We encrypt data in transit and at rest, enforce least‑privilege access and maintain tamper-evident logs. Change governance and audit artefacts support regulatory reviews without slowing delivery.
Yes. We provide documentation, runbooks, dashboards and handover sessions. Codebases follow clear conventions and modular boundaries. We can remain as a partner for optimisation and features, or support a clean transition to your internal teams.
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.