Senior Full Stack Developer - Portfolio Management System

Luxoft Poland; Polska; On-site; PLN 240,000 - 340,000; Full time

Benefits offered by this job

Private Medical

Dental care

Life Insurance

Internal Mobility

Job summary

Luxoft Poland is hiring an experienced Software Developer to modernize a mission-critical Portfolio Management System used by investment professionals. You will transform a mature WPF-based desktop platform into a modern, scalable ecosystem, covering UI, API development, performance, and architecture modernization.

Your role spans desktop and web delivery, API integration, and AI-enabled user experiences. You’ll work across data, service, and frontend layers with DevExpress and .NET

Qualifications

• 10+ years of professional software engineering experience delivering enterprise applications.
• Strong C# and .NET experience, including legacy .NET Framework and modern .NET versions.
• Deep experience with WPF, XAML, MVVM, desktop application architecture, and multithreading.
• Buy-side investment technology experience, particularly PMS/OMS/EMS and front-office workflows.
• Hands-on DevExpress experience, including complex grids and performance-sensitive UIs.
• Experience designing RESTful APIs using ASP.NET Core or equivalent.
• Python development for services, automation, analytics, or AI-related components.
• Strong SQL Server development and performance tuning skills.
• Experience creating both web-based and rich desktop applications.
• Profiling, diagnostics, memory management, performance tuning, and production troubleshooting.
• Experience with Git, CI/CD, and Azure DevOps or similar platforms.

Responsibilities

• Upgrade and modernize existing .NET/WPF/DevExpress applications.
• Refactor legacy components, reduce technical debt, and improve maintainability.
• Enhance UX while preserving critical front-office workflows.
• Contribute to target architecture decisions and phased modernization.
• Investigate and resolve performance issues across desktop/server/db/integration layers.
• Profile and optimize data loading, caching, and resource management.
• Design and build secure RESTful APIs for PMS data access.
• Develop integrations with trading, risk, reporting, and analytics systems.
• Implement authentication, authorization, validation, auditing, observability.
• Produce API specifications and technical documentation.
• Build AI-enabled prompt/chat experiences and integrate LLMs.
• Deliver across frontend, backend, service, integration, and data layers.

Skills

C# & .NET

WPF & XAML

MVVM

Multithreading

Portfolio Management

DevExpress

REST APIs

Python

SQL Server

Azure DevOps

Git

CI/CD

Tools

DevExpress

ASP.NET Core

MongoDB

React

Angular

Job description

Private Medical & Dental care & Life Insurance

Internal Mobility program - possibility of rotation between projects, locations, accounts

Project Description

We are seeking an experienced Software Developer to help modernize a mission-critical Portfolio Management System (PMS) used by investment professionals across front-office investment functions.

The successful candidate will play a key role in transforming a mature WPF-based desktop platform into a modern, scalable, high-performance application ecosystem. The work includes UI modernization, platform upgrades, API development, performance optimization, architecture simplification, technical debt reduction, and AI-enabled user experiences.

This role is well suited to an engineer with experience in buy-side portfolio, order, execution, risk, or investment analytics platforms who is comfortable working across desktop, web, service, integration, and data layers.

Responsibilities

Key Responsibilities:

Application Modernization

• Upgrade and modernize existing .NET, WPF, and DevExpress applications.
• Refactor legacy components, reduce technical debt, and improve maintainability.
• Improve the application user experience while preserving critical front-office workflows.
• Contribute to target architecture decisions and phased modernization plans.

Performance Engineering

• Investigate and resolve application freezing, slow response times, memory leaks, and crashes.
• Profile and optimize desktop, server-side, database, and integration components.
• Improve data loading, caching, processing, and resource-management patterns.
• Implement appropriate diagnostics, logging, health monitoring, and performance measures.
• Reduce reliance on legacy SOA, middleware, and tightly coupled dependencies.
• Design simpler service-oriented and API-first components.
• Support migration toward modular, scalable, and supportable architecture patterns.
• Assess MongoDB dependencies and recommend pragmatic simplification or replacement approaches.

API and Integration Development

• Design and build secure RESTful APIs for PMS data access.
• Develop integrations with trading, risk, reporting, analytics, and downstream systems.
• Implement authentication, authorization, validation, auditing, observability, and error handling.
• Produce clear API specifications and technical documentation.

AI Enablement

• Build an AI-powered prompt/chat experience within the PMS.
• Integrate enterprise Large Language Models and approved AI services.
• Develop prompt orchestration, tool-calling, retrieval, guardrails, and workflow automation capabilities.
• Partner with investment users to identify and deliver high-value, controlled AI use cases.

Web and Desktop Delivery

• Maintain and enhance rich desktop capabilities while introducing web-based applications where appropriate.
• Deliver across frontend, backend, service, integration, and data layers.
• Apply automated testing, code review, secure development, and CI/CD practices.

Skills required

• 10+ years of professional software engineering experience delivering enterprise applications.
• Strong C# and .NET experience, including legacy .NET Framework and modern .NET versions.
• Deep experience with WPF, XAML, MVVM, desktop application architecture, and multithreading.
• Buy-side investment technology experience, particularly in one or more of the following areas: Portfolio Management Systems (PMS) , Order Management Systems (OMS), Execution Management Systems (EMS), Front-office trading applications, Fixed income, equities, FX, derivatives, swaps, options, TRS, or CDS workflows
• Hands-on DevExpress experience, including complex grids and performance-sensitive user interfaces.
• Experience designing and implementing RESTful APIs using ASP.NET Core or equivalent technologies.
• Python development experience for services, automation, analytics, or AI-related components.
• Strong SQL Server development and performance-tuning skills.
• Experience creating both web-based applications and rich desktop/fat-client applications.
• Practical expertise in profiling, diagnostics, memory management, performance tuning, and production troubleshooting.
• Experience with Git, automated testing, CI/CD, and Azure DevOps or similar engineering platforms.

What is nice to have

• React, Angular, or comparable modern web framework experience.
• MongoDB and data-access modernization experience.
• Microservices, modular monolith, event-driven, or message-based architecture experience.
• Microsoft Azure, containerization, Kubernetes, and enterprise API management experience.
• Experience integrating LLMs, AI assistants, retrieval-augmented generation, tool-calling, or enterprise AI gateways.
• Familiarity with application security, data entitlements, auditability, and regulated environments.