Work

Work across web products, mobile platforms, and delivery systems.

Selected programs where Denis owned delivery, platform quality, or a difficult system boundary. The portfolio begins in web product engineering, then expands into mobile architecture and multi-team responsibility.

The case studies intentionally omit private architecture, credentials, unreleased product detail, and internal commercial metrics.

01 · Multi-market delivery

Three regulated launches across three parallel roadmaps

Portfolio leadership for Zinx Romania, Betoro Denmark, and YoYo Sweden, with YoYo reaching production in approximately five months.

Context: Three concurrent mobile teams were delivering for different regulated markets while staffing, priorities, dependencies, and compliance requirements continued to move.
Responsibility: Led the 15-engineer portfolio, coached two Team Leads, retained accountability for delivery and team health, and aligned Product, Design, QA, Backend, Payments, and Compliance.
Approach: Introduced one operating model for estimation, capacity, dependency mapping, milestones, and release gates. Kept technical escalation close enough to resolve signing, native SDK, WebView bridge, store, and incident risks.
Outcome: All three products reached their regulated go-live windows on schedule. YoYo moved from initial implementation to production in about five months.
Selected stack: Flutter, Dart, Kotlin, Swift, REST/WebSockets, Firebase, GitLab CI/CD, Codemagic, Fastlane, Sentry/Crashlytics

02 · Platform modernization

A shared Flutter core and release system for ten applications

Modernized the platform underneath a multi-brand portfolio while active products continued to ship.

Context: Ten applications shared a Flutter core and brand-specific configuration. Version divergence and repeated release setup increased maintenance and production risk.
Responsibility: Led the shared core migration from Flutter 3.19 to 3.38.1 and standardized reusable GitLab CI/CD and Codemagic workflows across product teams.
Approach: Consolidated platform configuration, release checklists, review standards, automated testing, observability, and incident follow-up while delegating day-to-day team execution through Team Leads.
Outcome: Reduced platform divergence and repeated setup work, improved release ownership, and created a consistent production-readiness baseline across the portfolio.
Selected stack: Flutter 3.19-3.38.1, GitLab CI/CD, Codemagic, Fastlane, automated testing, Sentry, Crashlytics

03 · Fintech operations

A 100+ screen operations platform built from the ground up

Hands-on Flutter engineering for a VPN-secured operations product spanning KYC, AML, cards, IBAN, transactions, permissions, and support workflows.

Context: Internal finance operations required a dense, reliable interface with many business states, access rules, real-time updates, and compliance-sensitive workflows.
Responsibility: Served as the sole Flutter developer for the platform described in the current CV, while working within the wider engineering organization.
Approach: Created reusable tables, forms, permissions, access-control, and real-time components using a modular architecture and a test-focused delivery model.
Outcome: Delivered more than 100 production screens in 18 months with a shared component model that supported consistent implementation across operational domains.
Selected stack: Flutter Web/Desktop, Dart, Clean Architecture, BLoC, get_it, REST, WebSockets, TDD, unit and golden tests

04 · Geospatial commerce

House-level delivery matching without a paid geocoder

A custom OpenStreetMap-based address pipeline for a farm-food marketplace serving 150,000 registered customers.

Context: Delivery accuracy depended on normalizing inconsistent addresses and matching them at house level without relying on a paid external geocoding service.
Responsibility: Personally designed and delivered the geocoding, address-normalization, and matching pipeline alongside user-facing catalogue, cart, checkout, delivery, and subscription work.
Approach: Combined OpenStreetMap data with product-specific normalization and geospatial rules, then integrated the output into operational and customer delivery flows.
Outcome: Improved delivery-address accuracy and operational reliability for a product serving 150,000 registered customers.
Selected stack: Flutter, Dart, OpenStreetMap, Firebase, REST, Clean Architecture, TDD, native Android/iOS integrations

05 · Web product engineering

More than 100 web products before the mobile chapter

A five-year foundation in websites, e-commerce, operational panels, calculators, payment integrations, and lead-generation systems.

Context: Small and medium businesses needed complete digital products, not isolated UI work: discovery, implementation, hosting, integrations, and a path to measurable use.
Responsibility: Founded and led a two-to-four-person web studio and remained hands-on across frontend, product logic, integrations, delivery, and client communication.
Approach: Built proportional solutions for commerce, administration, payments, calculations, and lead generation, choosing the simplest architecture that could be operated after handoff.
Outcome: Delivered more than 100 small-to-medium web projects between 2015 and 2019—the foundation for later product, platform, and engineering leadership work.
Selected stack: HTML/CSS, JavaScript, PHP, CMS and commerce platforms, payment integrations, analytics, hosting, AngularDart

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