Soltani Fedi

Full Stack .NET Developer — Permanent · Tunis

Time & Performance — multi-tenant SaaS platform for time tracking and performance management

• Identified a licensing compliance risk with MediatR and AutoMapper (dual-licensed since 2025) and led the migration to a custom OSS dispatcher and Application Services: 100+ CQRS handlers replaced, 9 mapping profiles moved to Mapperly, and a Read/Write Repository separation with the Specification pattern across 5 domain aggregates.
• Hardened the JWT lifecycle: atomic one-time refresh token rotation via compare-and-swap with reuse detection, revocation of every session on detected replay and on password change, and hot revalidation of Identity roles with token invalidation.
• Implemented end-to-end optimistic concurrency: PostgreSQL xmin as the EF Core token with conflicts surfaced as HTTP 409, the token echoed from Angular detail screens and edit modals, and real-time Editing Presence over SignalR to warn before a collision happens.
• Built the multi-tenant data isolation layer (EF Core Global Query Filters, per-tenant JWT claims) and hardened multi-role RBAC: entity-level permissions and navigation flags (canNavigate / canManage) exposed by the API and enforced front and back.
• Standardised inbound API contracts (*Request) and lightweight mutation DTOs, with a refetch-GET pattern to reduce over-fetching; a contract audit across 4 modules delivered 11+ fixes, complemented on the frontend by lazy-loaded dropdowns and RxJS caching.
• Centralised application logging with Serilog on the ASP.NET Core host (.NET 10): structured JSON logs, multi-tenant enrichment (TenantId, UserId, CorrelationId, X-Correlation-ID) and configuration-driven setup via appsettings.
• Strengthened test coverage across the stack: PostgreSQL integration tests under Testcontainers (409 conflicts, tenant isolation), unit tests for API controllers, Application and Infrastructure layers (xUnit, Moq, FluentAssertions) and Angular (Karma/Jasmine), wired into GitHub Actions quality gates.
• Delivered and operated the multi-tenant SaaS API packaged as a Docker container on Azure App Service via Azure Container Registry (Dev and Staging environments).

Stack — .NET 10 · Angular 18 · PostgreSQL · JWT · SignalR · Serilog · Testcontainers · Docker · Azure

Full Stack .NET Developer — Freelance · Tunis

AutoCAD plugin for hydraulic structures and a licensing platform

• Built a .NET 8 AutoCAD plugin automating culvert and technical sheet creation from an alignment and a surface, including geometric and hydraulic calculations and 3D model generation.
• Integrated the plugin with HY-8 (FHWA) software via automated export of calculated data, to verify hydraulic results.
• Built a custom licensing platform: hardware identification, a REST verification API and a heartbeat mechanism blocking access if the licence becomes invalid.

Stack — .NET 8 · AutoCAD .NET API · Razor Pages · Dapper · SQL Server

Full Stack .NET Developer — Freelance · Tunis

GSL-MMM — ERP for delivery and customer management

• Developed the invoice discharge management module, improving financial tracking of deliveries.
• Built the inter-warehouse delivery module (planning, tracking and traceability of stock transfers between sites) and a customer return template, alongside targeted bug fixes across customer management workflows.

Stack — .NET 5 · Entity Framework · SQL Server · jQuery

Full Stack .NET Core Developer — Consultant, Quebec Ministry of Transport

APVHN — permit management for oversized convoys

• Designed the application architecture of a government-grade permit management system and developed the core business modules: expertise, vehicles, permit generation.
• Managed user authentication and access controls, and integrated external services to automate data exchanges.
• Led the progressive migration from .NET 6 to .NET 8 across the whole solution and implemented xUnit unit tests on the core modules.
• Built Studio 44, a Pilates studio management app: classes, subscriptions, registrations, with a UX/UI redesign of the sign-up flow to reduce drop-off.

Stack — .NET 6/8 · Razor Pages · SQL Server · xUnit · Azure DevOps

Full Stack .NET Developer — External consultant, Tunisie Telecom

Workflow Backbone — national internet subscription management platform

• Identified and resolved performance bottlenecks through SQL profiling and execution plan analysis on a nationally deployed platform.
• Integrated third-party web services (REST, SOAP) to enrich request qualification and acceptance features, and improved stored procedures on SQL Server and PostgreSQL.

Stack — .NET Standard · SOAP · SQL Server · PostgreSQL

Full Stack .NET Developer — Tunis

Multichannel ticketing software

• Developed new features (IT asset management) and automated business workflows: prioritisation, SLA, notifications.
• Improved performance via caching and SQL query optimisation, contributed to the module migration to .NET Core and optimised CI/CD pipelines on TeamCity.
• Delivered in Agile Scrum, mentoring junior developers through code reviews and pair programming sessions.

Stack — .NET Framework 4.8 · React · TypeScript · TeamCity