Back-end Case

Global Engineering

Back-end Success Stories

Explore how FiftyFive builds powerful back-end systems

React, Node.js, MariaDB

Investment Platform Development and Modernization

A Swedish FinTech investment platform supporting private banking and asset management was modernized by refactoring backend services, standardizing the React frontend, integrating CRM and brokerage services, and introducing automated QA workflows to improve performance, reliability, and maintainability.

Laravel, Django, React

Crypto Payment Platform for Affiliates and Merchants

Cryptocurrency payment platform supporting affiliate onboarding and merchant transactions across modules. The system integrated backend services, frontend interfaces, AML/KYC workflows, third-party services, QA processes, and deployment practices, enabling transaction processing, shared logic with independent scaling, and white-label configurations for merchants.

React Native, Node.js, Python

Modernizing Ecommerce Platform and Mobile Application

The platform supports global personalized print ordering and fulfillment. Legacy systems were modernized to microservices, a mobile application was added, and ML-based routing introduced, alongside backend, frontend, DevOps, QA, agile workflow improvements, documentation, and integrations.

Flutter, .NET, SQL

Port Operations Management System Modernization

Mobile-first port management system replaced manual workflows with automated job assignment, container tracking, and routing.

Vue 3, Java, Spring Boot

Enterprise Platform UI Upgrade: Vue 2 to Vue 3

The platform supports enterprise application workflows built on a .NET-based system with a Vue frontend. The project migrated frontend views and components from Vue 2 to Vue 3, refactoring code for compatibility, updating syntax, and validating functionality through structured frontend testing.

.NET Framework, JavaScript, SQL

SaaS Platform Maintenance and Feature Enhancement Services

Ongoing maintenance and enhancement of a legacy SaaS platform supporting digital performance monitoring and observability. Work focused on stabilizing systems, addressing vulnerabilities, adding frontend and backend features, and integrating external backend services while following structured SCRUM workflows.

Unreal Engine, Meta Quest 2, IoT Integration

Smart Home IoT Unified Appliance Management Platform

A centralized system enabling unified control of multiple smart home appliances through a single mobile interface. The solution added backend services for device connectivity, structured UI/UX workflows, and an immersive metaverse layer supporting 3D and VR-based appliance interaction.

Flutter, React, Spring Boot

Accounting Workflow & Document Automation Platform

AI-driven platform automates document processing and accounting workflows, replacing manual data entry and paper-based records.

Swift, React, .NET Core

Sweden HVAC IoT Platform for Remote Heating Control

Mobile and web applications enabled remote heating control, maintenance workflows, and IoT device management for homeowners, technicians, and administrators. The system integrated IoT connectivity, backend services, cloud deployment, and automated QA to support cross-platform use and large-scale device operations.

React, Node.js, Strapi

Multi-Organization CMS and Web Platform Development

A unified CMS and web platform supporting multi-organization content management, data imports, analytics, and interactive modules. The system integrated backend services, frontend workflows, analytics pipelines, DevOps automation, and QA processes to streamline operations and support scalable, accessible user engagement.

React Native Web, Golang, Python

Immigration Visa Processing Platform Development

An automated immigration platform enabled real-time visa status tracking, document extraction, and deadline monitoring. Manual workflows were replaced with event-driven backend services, responsive web interfaces, automation pipelines, and integrations with government portals, supported by structured data storage and quality assurance processes.