Sergiu Giuglea

I build real-time platforms that survive contact with real users.

.NET Developer with 3+ years of hands-on experience building full-stack platforms, desktop applications, cloud-hosted systems and Android products using C#, ASP.NET Core, SQL and modern software-engineering practices. Real-time platforms, cloud-native backends, and AI-ready architecture, shipped, tested, and running in production.

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01About

Backend-first engineering,
built to hold up under real use.

Open to work

Est. 2022

API
Cache
Live
AI
Auth
DB

I build the kind of software that has to actually hold up once real people are using it: APIs, real-time features, systems that don't buckle the moment traffic picks up. C#, ASP.NET Core, EF Core and SQL Server are where I'm strongest, with SignalR for anything that needs to happen live. But I'll reach for whatever a project genuinely calls for, Python and Java when that's been the right call, JavaScript and TypeScript on every frontend I've built (this site included), and Kotlin end to end on Board Name, my Android app.

Lately that same care has been going into AI-ready architecture: building services and data layers so an AI feature, an agent, or an automation can be dropped in later without tearing everything apart to make room. Signal, the assistant on this site, is that idea already built and running, not just a claim on a slide.

What I actually enjoy is the unglamorous part: query plans that make sense, indexes that are actually used, a CI/CD pipeline you can trust, and code a teammate can pick up without me walking them through it first.

0+

Major applications delivered

0+

Languages across those projects

0+

Years of experience

AI chatbot, bottom-right

02Services

What I can build
for your business.

From production backends to AI-ready foundations, scoped to what your business actually needs, not what's trendy.

Business websites·Custom software·Booking & scheduling systems·Customer portals·AI chatbots & assistants·Internal tools & dashboards·Database systems·Cloud hosting & deployment·Mobile apps·Automation & integrations·Real-time features·System upgrades & rebuilds·Business websites·Custom software·Booking & scheduling systems·Customer portals·AI chatbots & assistants·Internal tools & dashboards·Database systems·Cloud hosting & deployment·Mobile apps·Automation & integrations·Real-time features·System upgrades & rebuilds·
01

.NET & Backend Engineering

The engine room of your product: APIs, business logic and data, built on C# and ASP.NET Core so it still makes sense a year from now, not just on launch day.

  • APIs that your website, app or other tools can plug straight into
  • A database that's organised properly from day one, not patched together
  • Reports and dashboards that pull real, accurate data
  • Performance tuning, so things don't slow down once real customers show up
02

Full-Stack Web Development

A complete website or web app, front to back, built to feel responsive and alive rather than a form that submits and reloads.

  • A website or web app people actually enjoy using
  • Booking, scheduling and payment flows that just work
  • Live updates on screen, no refreshing to see what's new
  • Proper logins and permissions, so the right people see the right things
Growing focus03

AI Developer & AI-Ready Solutions

Practical AI, not a science project: chatbots, automation and smart features that solve a real problem for your customers or your team. Signal, the chat widget on this site, is a live example, not a slide, and I can build the same kind of thing for your business.

  • A chatbot or assistant trained on your own business, like Signal
  • AI features that plug into what you already have, not a rebuild
  • Automation that takes the repetitive work off your team's plate
  • Built to actually pay for itself, not run up a surprise bill
04

Cloud, DevOps & Reliability

Getting your app live and keeping it that way: hosted properly, monitored, and set up so new updates go out smoothly instead of being a nerve-wracking event.

  • Hosting that's set up properly from the start, not duct-taped together
  • Monitoring and backups, so problems get caught before your customers notice
  • Smooth, repeatable updates, no more risky manual deploys
  • Testing built in, so bugs get caught before they go live
03Selected work

Systems in production,
not just prototypes.

Production platforms, independently developed products and technically substantial university projects, built across web, desktop, cloud, AI and Android.

~/ai/signal.exe
Does he know SQL?

Signal

Yes, SQL Server, PostgreSQL, MySQL. In production: PostgreSQL via Dapper for GFS Taxi’s booking platform, SQL Server for Mentorise…

Live now

Signal · AI Developer

An AI chatbot that actually answers questions about me

Signal is the chat widget in the corner of this page: a cost-controlled AI assistant that answers real questions about my work, stack, and availability, mixing a free local matching layer with the Claude API so most conversations cost nothing to run.

$0

Typical question costs

Claude API

Novel questions handled by

Bottom-right, live

Find it

The problem: A portfolio site is a one-way conversation. Recruiters have follow-up questions a static page can't answer, and a naive chatbot that calls a paid AI API on every message racks up real cost on every idle visitor and every repeated question.

  • What it does: Answers real questions about my experience, stack, projects and availability right here on the page, and points visitors to a real conversation with me when it genuinely doesn't know something.
  • Cost control: A free local keyword and fuzzy-matching layer, trained on real recruiter screening questions, answers most conversations before any paid API call happens.
  • AI layer: Genuinely novel or longer questions stream from the Claude API token by token, with per-IP and site-wide daily rate limits so no burst of traffic can run up an unexpected bill.
  • Data: Serverless Postgres on Neon tracks chat rate limits, the game leaderboard, and the visitor counter, all on one lightweight database.
  • For your business: The same pattern, a scoped assistant that actually knows your product and costs close to nothing to run, is exactly what I'd build for a business that wants AI without an open-ended bill.
Next.jsTypeScriptClaude APIAnthropic SDKStreaming responsesNeon PostgresVercel Edge
Mentorise

Inspire and be inspired

2024 / Present

Mentorise · Software Engineer

Mentorship, learning & career-development platform

Mentorise is a social platform for mentorship: mentors and mentees build profiles, get matched by an engine that explains its own reasoning, connect, message in real time, learn through courses, and find job opportunities, all in one place.

Social platform

Mentors, mentees & a match engine

Real-time everywhere

Chat, alerts & live updates

Google Cloud

Secure, production infrastructure

C#.NET 8ASP.NET Core MVCRazor PagesEF CoreASP.NET IdentitySignalRSQL ServerGoogle Cloud SQLGoogle Cloud StorageSecret ManagerBootstrap 5
2022 / 2024

GFS Taxi · Full-Stack Software Developer

Booking, dispatch and taxi operations platform

A multi-role taxi booking and dispatch system that began as a university software-engineering project and was later independently extended, redesigned and deployed as GFS Taxi. The platform centralises customer bookings, driver assignments, schedules, journey management, navigation and office operations.

3

Customer, driver and office roles

Google Maps

Pickup navigation integrated

Deployed

Extended into GFS Taxi

C#.NETWindows FormsMySQLLINQRepository PatternGoogle MapsiTextUMLAgile
Meet Board Name, the simplest way to display names offline
Pre-release

Board Name · Android Developer

Digital display boards for Android

Board Name replaces paper and handwritten signs with instant, full-screen digital display boards for transport, events, hospitality, education and business, adapting to phones, tablets and foldables.

Auto-fit text

Adapts to any screen

Fully responsive

Phones, tablets & foldables

Closed testing

Multi-device validated

KotlinJetpack ComposeMaterial Design 3Compose NavigationAndroid SDKWindowInsets APIState HoistingCompose Animations

Have a system that needs to be built, rebuilt, or made AI-ready? I’m taking on new projects.

Start the conversation
04University projects

University engineering projects

Complete systems, data projects and technical investigations developed throughout my Software Engineering degree, not professional work, but technically substantial in its own right.

Dissertation

Football Mate

Full-Stack Developer

A location-based football community platform that enables users to create teams, organise matches, join local games and discover nearby football grounds.

C#ASP.NET CoreRazor PagesEntity Framework CoreASP.NET IdentitySQL+2
Football Mate main dashboard

Machine learning project

House Price Prediction

Machine Learning Project

An end-to-end regression project predicting house prices from property size, bedrooms, bathrooms and location. Linear Regression performed best, reaching roughly 0.93 to 0.94 R² on this near-linear dataset.

PythonPandasNumPyMatplotlibScikit-learnLinear Regression+2
Data exploration notebook: dataset shape and null checks

Advanced programming project

Online Bookstore Management System

Advanced Programming Project

A secure C# desktop application for managing customers, inventory, publishers and orders through a MySQL-backed architecture.

C#.NETWindows FormsMySQLADO.NETLINQ+2
Bookstore management dashboard

SQL database project

Student Record Management Database

SQL Database Project

A relational university database for managing students, staff, modules, campuses, examinations and grades.

MySQLSQLUMLERDViewsStored Procedures+2
Student Record Management Database entity-relationship diagram

Data engineering project

Advanced Databases and Big Data Analytics

Data Engineering Project

A data-analysis and database portfolio examining large datasets, data wrangling, SQL, NoSQL, scalability and machine-learning-assisted database optimisation.

PythonSQLMySQLPandasBig DataNoSQL+2

Infrastructure design project

Hybrid Cloud & Network Infrastructure

Infrastructure Design Project

A secure and scalable hybrid-cloud infrastructure proposal combining on-premises servers, cloud virtual machines, networking, firewalls, VPNs and disaster recovery.

AWSAzureCloud VMsNetworkingTCP/IPSocket Programming+1

Java programming portfolio

Data Structures and Algorithms

Java Programming Portfolio

A Java application demonstrating searching, sorting and algorithmic problem-solving using pseudocode, flowcharts, implementation and testing.

JavaAlgorithmsArraysSearchSortingFlowcharts+1

Team software-engineering project

Wonderkids Party Zone

Full-Stack Developer

An Agile university team project: an event and children's party-booking platform covering account registration, service and package browsing, availability checking, booking, payment and an administrative dashboard.

C#.NETASP.NET Core MVCRazor PagesEntity Framework CoreSQL+4
Wonderkids Party Zone public home page
05Stack

The tools I reach for
to ship reliable software.

C#·TypeScript·JavaScript·Kotlin·Python·Java·.NET 8·ASP.NET Core·Web APIs·Entity Framework Core·LINQ·SignalR·Dapper·Next.js·Razor Pages·MVC·Tailwind CSS·HTML·CSS·Kotlin·Jetpack Compose·Material Design 3·Android SDK·Claude API·Anthropic SDK·Prompt engineering·Cost-controlled AI architecture·SQL Server·PostgreSQL·MySQL·Database Design·Query Optimisation·Google Cloud·Cloud SQL·Cloud Storage·Secret Manager·Azure·Docker·Nginx·GitHub Actions·Vercel·Git·Dependency Injection·SOLID·Clean Architecture·Service-Oriented Architecture·Repository Pattern·Layered Architecture·xUnit / NUnit·Async Programming·Agile (Scrum)·Jira·UML·Requirements Analysis·C#·TypeScript·JavaScript·Kotlin·Python·Java·.NET 8·ASP.NET Core·Web APIs·Entity Framework Core·LINQ·SignalR·Dapper·Next.js·Razor Pages·MVC·Tailwind CSS·HTML·CSS·Kotlin·Jetpack Compose·Material Design 3·Android SDK·Claude API·Anthropic SDK·Prompt engineering·Cost-controlled AI architecture·SQL Server·PostgreSQL·MySQL·Database Design·Query Optimisation·Google Cloud·Cloud SQL·Cloud Storage·Secret Manager·Azure·Docker·Nginx·GitHub Actions·Vercel·Git·Dependency Injection·SOLID·Clean Architecture·Service-Oriented Architecture·Repository Pattern·Layered Architecture·xUnit / NUnit·Async Programming·Agile (Scrum)·Jira·UML·Requirements Analysis·

Languages

C#TypeScriptJavaScriptKotlinPythonJava

Backend

.NET 8ASP.NET CoreWeb APIsEntity Framework CoreLINQSignalRDapper

Frontend & Web

Next.jsRazor PagesMVCTailwind CSSHTMLCSS

Mobile (Android)

KotlinJetpack ComposeMaterial Design 3Android SDK

AI & LLM

Claude APIAnthropic SDKPrompt engineeringCost-controlled AI architecture

Databases

SQL ServerPostgreSQLMySQLDatabase DesignQuery Optimisation

Cloud & DevOps

Google CloudCloud SQLCloud StorageSecret ManagerAzureDockerNginxGitHub ActionsVercelGit

Practices

Dependency InjectionSOLIDClean ArchitectureService-Oriented ArchitectureRepository PatternLayered Architecture

Other

xUnit / NUnitAsync ProgrammingAgile (Scrum)JiraUMLRequirements Analysis
06Try me

Think you can out-run
the signal?

A small, pointless, extremely satisfying game. Collect data packets, dodge latency spikes, don't hit the walls.

~/games/signal_runner.exe

0
SCORE 000

Swipe or tap the arrows to move

Grab the violet packets. Avoid the red spikes. Don’t hit the wall.

07Path

Experience & education

  • Oct 2024 / Present

    Software Engineer

    Mentorise · Remote, London

    Solo full-stack delivery of a mentorship, learning and career platform: matching engine, real-time messaging, courses, jobs, and secure Google Cloud deployment.

  • 2023 / Present

    Freelance Software Developer

    GFS Taxi · Chichester

    Continued a university taxi-management project independently and developed it into a deployed booking and dispatch platform, supporting customer bookings, driver allocation, schedules, Google Maps navigation, PDF receipts and office operations.

Side projects

  • Signal

    AI chatbot on this site, built on the Claude API

  • Board Name

    Android app in Kotlin, in Google Play Closed Testing

Education

BSc Software Engineering (First-Class Honours)

University of Bolton · 2025

Certifications

  • C# Programming Comprehensive Course
  • Java Development Bootcamp
  • Python Pro Bootcamp
08Contact

Let’s build something
that actually ships.

Whether it's a backend that needs to scale, a platform that needs real-time features, or a system that needs to become AI-ready, I'd like to hear about it.

serjinio101@gmail.com
+44 7496 178483
Chichester, UK
Eligible to work in the UK