Mubassir Hasan — Software engineer

Engineering backends that hold up under load, and mobile apps that ship on time.

Senior engineer working primarily in .NET Core and Flutter. I build the systems behind hospital feedback loops, multi-channel customer support, hotel and air-ticket bookings, and ERPs — and I tune them when they slow down.

  • 8+ Years building software Since 2018
  • 4 Companies shipped for B2B, B2C, healthcare, real-estate
  • 11 Projects in production Backend, mobile, integrations
  • 2 Domains lead .NET Core · Flutter

Experience

8 yr 4 mo across four companies — backend, mobile, integrations.

  1. Toucan IP TV

    Software Engineer
    May 2023 — Present ~3 yr

    • Omnichannel Support Hub

      Designed a customer support system that unifies Telegram, WhatsApp, and embedded web chat into one operator inbox. Outcome: a single place to triage every customer touchpoint without context-switching between vendor consoles.

      • .NET Core
      • C#
      • MSSQL Server
      • WhatsApp Business API
      • Telegram Bot API

    • Grouped Business Mail

      Built a mail routing layer that auto-groups incoming business mail under the originating business identity, removing the manual sort step and giving each business its own conversation thread.

      • .NET Core
      • IMAP/SMTP
      • MSSQL Server

  2. Evercare Hospital Dhaka

    Analyst Programmer
    Dec 2021 — Apr 2023 1 yr 5 mo

    • Net Promoter System (NPS)

      Built a patient-facing feedback platform that turns service experience into a queryable signal. Decision-makers use the summary reports to surface underperforming departments and to recognize teams scoring well — closing the loop between patient voice and operational change.

      • .NET Core
      • MSSQL Server
      • jQuery

    • E-Care (Patient Mobile App)

      Cross-platform Flutter app for patients: appointment booking, prior medical records access, and in-app payment for medical services. Same backend the NPS system runs on, so feedback and care data live together.

      • Flutter
      • .NET Core
      • MSSQL Server

    • On-demand Reports

      Replaced static report bundles with on-demand reports built to operator requirements; tuned legacy report execution for noticeably smoother runs.

      • Crystal Reports
      • .NET Core
      • MSSQL Server

  3. A4 Aero Limited

    Software Engineer
    May 2019 — Nov 2021 2 yr 7 mo

    • Hotel Booking Platform

      Owned both ends of a hotel booking system — search, booking, payments. Wrote a synchronization layer that pulls inventory from multiple hotel providers and normalizes it through internal data models, so every downstream surface speaks the same shape.

      • .NET Core
      • .NET MVC5
      • MSSQL Server

    • Biman Bangladesh Airlines — Air Ticket Issues

      Triaged and shipped fixes for live air ticket booking issues against Biman Bangladesh Airlines integrations.

      • .NET MVC5
      • GDS APIs
      • MSSQL Server

    • .NET 4.6 → .NET Core 5 Migration

      Lead-migrated the B2B and B2C air-ticket and hotel booking apps from .NET 4.6 to .NET Core 5 — frontend and backend both. Kept feature parity through the cut-over so business never paused.

      • .NET 4.6
      • .NET Core 5
      • MSSQL Server

    • Real-Estate ERP

      Maintained and extended an ERP used in the real-estate sector, including an accounting-system integration that tightened day-to-day operational efficiency.

      • .NET MVC5
      • Crystal Reports
      • MSSQL Server

  4. Alpha Broadway System

    Software Engineer
    Mar 2018 — Apr 2019 1 yr 2 mo

    • Cattle Management Software

      Built farm management software for a multi-farm operator: feed-mix accounting (purchased ingredients → mixed feed → cattle fed), real-time expense and revenue summaries, and a profitability view per farm.

      • .NET MVC
      • C#
      • MSSQL Server

    • ISP Complaint Management

      Customer-facing complaint system for ISP subscribers — lodge, track, escalate. Cut the time between fault report and assigned tech.

      • .NET MVC
      • C#
      • MSSQL Server

    • In-Network Entertainment App

      Mobile app delivering movies and dramas over the ISP intranet, plus package info, supported FTPs, and tips for public users — one app for both subscribers and prospects.

      • Android
      • Java
      • .NET Web API

    • Report Performance Rescue

      Cut report generation from 3–5 minutes (occasionally requiring an SQL Server restart due to memory pressure) down to 2–3 seconds. Also contributed to a third-party accounting integration in collaboration with PwC.

      • MSSQL Server
      • .NET MVC
      • Crystal Reports

Stack

What I reach for, and why.

I work mainly in two stacks. The clusters below are the tools I lean on most often, grouped by the kind of work they do — not a list of every keyword that has ever crossed my screen.

  • backend

    Backend

    Where most of my work lives — building services that other systems can rely on.

    • .NET Core
    • ASP.NET
    • C#
    • Web API
    • REST integrations
  • mobile

    Mobile

    Cross-platform apps shipped against the same backend that powers the web.

    • Flutter
    • Dart
    • Android (Java)
  • data

    Data

    Schema design, query tuning, and migrations under live workloads.

    • MSSQL Server
    • MongoDB
    • Crystal Reports
    • Schema migration
  • devops

    DevOps & Hosting

    Hosting and shipping the things I build — Windows or Linux, container or bare.

    • Docker
    • Linux & Windows hosting
    • GitHub Actions (CI/CD)
  • collaboration

    Collaboration

    How I work with teams when the code stops being the only thing in the room.

    • Git / git-flow
    • GitHub Projects
    • Jira
    • Trello
    • Slack

Currently

Open to senior backend, full-stack, and Flutter work — full-time or contract.

If you're hiring for a system that needs an experienced engineer on it, or you're vetting consultants for a stretch of focused work, I'd like to hear what you're trying to ship.

Start a conversation Or just email me