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
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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.
* 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.
* 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.
* 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. SKILLSMust have
* 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. 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. #J-18808-Ljbffr

📌 Senior Full Stack Developer (Marbella)
🏢 Luxoft
📍 Marbella