Ranjeet Gujjar — Portfolio

🧑‍💻

NSERC INTERN · TOP 1.25%

about me

WHO AM I?

Second-year CS student at Dalhousie University — NSERC CREATE Cybersecurity Research Intern actively breaking and securing real IoT-cloud systems. Researching MQTT and REST API attack surfaces with Dr. Srini Sampalli on live AWS infrastructure.

CTF competitor with 2,200+ points, ranked 5th at Dal & 70th globally. TryHackMe Top 15% worldwide. Cisco-certified in Cybersecurity and Networking. National top 1.25% among 1.2M JEE candidates — I don't wait to learn, I build and break things.

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Top 1.25%JEE Mains 2022 · 1,200,000 candidates · India

arsenal

MY SKILLS

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Cybersecurity

Network ScanningMQTT SecurityIoT-Cloud SecurityCryptographyMITM / DoS / ReplayOffensive & DefensiveIncident TriageCTF Problem Solving

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Languages

PythonJavaJavaScriptHTMLCSSSQL

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Tools & Platforms

NmapWiresharkGit / GitHubLinux (Kali)AWS IoT CoreCisco Packet TracerActive DirectoryMicrosoft 365

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Concepts

OOPData StructuresDBMSWeb DevNetworkingSystems Programming

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Research

Literature ReviewTechnical DocumentationStakeholder CommsResearch ReportingPresentation Skills

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CTF & Practice

TryHackMe Top 15%Web ExploitationDigital ForensicsReverse EngineeringDal CTF Competitor

work history

EXPERIENCE

🛡 NSERC CREATE Cybersecurity — Dalhousie

May 2026 – Aug 2026

Research Intern · IoT & Cloud Security (Dr. Srini Sampalli)

Conducting security vulnerability research across 2 IoT-cloud protocols (MQTT & REST APIs), performing 5+ attack simulations including MITM, DoS, replay, and false data injection.
Reviewed 10+ IEEE & ACM papers to map attack vectors and mitigation strategies; identified 3 novel cross-protocol research gaps not addressed in existing literature.
Designed and deployed a 2-device cybersecurity testbed (Raspberry Pi 4 & 5) running live MQTT brokers integrated with AWS IoT Core for real-world attack experimentation.
Evaluated 3 security mechanisms — authentication, authorization, encrypted data transmission — across MQTT and REST API stacks in a live cloud environment.
Delivered 5+ weekly progress reports to faculty supervisors, documenting findings and iterating on experimental design.

MQTT SecurityAWS IoT Core5+ Attacks Simulated3 Research Gaps Found

🏁 Dal CTF Competition — Team Sloopy

2026

CTF Competitor

Solved 35+ challenges, accumulating 2,200+ points across web exploitation, cryptography, digital forensics, and reverse engineering.
Ranked 5th among all Dalhousie University teams and 70th globally in the open-division leaderboard among hundreds of competing teams.

2,200+ Points5th @ Dalhousie70th Global

🔬 Persuasive Computing Lab — Dalhousie

May 2025 – Jan 2026

Research Assistant · AI/ML & HCI

Conducted a structured literature review of 100+ academic papers across 9 months, identifying key trends and research gaps in AI/ML models for HCI.
Designed project methodologies and timelines for a multi-phase ML research initiative, coordinating deliverables across 3+ stakeholder groups including faculty and lab researchers.
Produced 10+ technical documentation artifacts (research summaries, methodology docs, progress reports) supporting subsequent experimental phases.

100+ Papers10+ Docs ProducedAI/ML · HCI

🎓 Dalhousie University — CSCI 1300

Jan 2025 – Apr 2025

Course Representative

Elected representative for 100+ students; gathered structured feedback across 4 months and presented findings to faculty, directly contributing to 2+ course delivery improvements.
Organized bi-weekly peer study sessions, improving student engagement and supporting classmates with course material throughout the term.

100+ StudentsElected Leadership

🍔 McDonald’s — Spring Garden, Halifax

Oct 2024 – Present

Crew Trainer

Trained and onboarded 30+ new crew members on food safety protocols, service standards, and operational procedures across 18+ months in a high-volume environment.
Reduced average new-hire ramp-up time by consistently delivering structured 3-day onboarding sessions; maintained 100% adherence to health and safety standards.
Supported shift managers in daily operations and resolving customer concerns in fast-paced environment.

30+ Crew TrainedFast-Paced Leadership

🏟 Dalhousie Varsity Events (Dalplex)

Jan 2025 – Present

Event Team Member

Planned and executed university-wide sports and social events with cross-functional teams.
Solved operational challenges during live events and demonstrated leadership managing small teams during high-attendance events.

Live Event OpsTeam Leadership

built by me

PROJECTS

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Python Port Scanner

→ github.com/gujjar23/python-port-scanner

Multithreaded TCP port scanner supporting 500 concurrent threads across all 65,535 ports. Service fingerprinting across 40+ well-known ports (HTTP, SSH, FTP, RDP, MySQL) with real-time colored CLI output. ~80% faster than single-threaded baseline via queue-based task distribution.

PYTHONTHREADINGNETWORKINGCLI

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Password Strength Checker

→ github.com/gujjar23/password-strength-checker-java

3-tier classification system (weak / moderate / strong) evaluating passwords across 5+ criteria including length, character diversity, and complexity rules. Modular Java architecture across 4+ classes with actionable per-criterion feedback.

JAVAOOPSECURITY

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Movie Review Website

→ hackofanonymous.blogspot.com

Founded and managed a movie review site with 1,000+ monthly visitors. Full ownership: design, SEO optimisation, and analytics from day one.

HTMLCSSJSSEO

academia

EDUCATION

DALHOUSIE
UNIVERSITY

Bachelor of Computer Science

Sep 2024 – Expected 2028 · Halifax, NS

Work Term Availability: Fall 2026 (4 months). Active in research and student leadership from year one. Secured NSERC CREATE Cybersecurity Internship in second year under Dr. Srini Sampalli. Previously held a Persuasive Computing Lab Research Assistant position and was elected Course Representative for CSCI 1300.

Relevant Coursework

CSCI 1105, 1110Java & Object-Oriented Programming

CSCI 1109, 2141Python, SQL, DBMS, Data Science

CSCI 1170Web Development (JS, CSS, HTML)

CSCI 1120Systems Programming

credentials

CERTIFICATIONS

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Networking Basics

Cisco Networking Academy — ICTC

Nov 2025View Credential ↗

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Introduction to Cybersecurity

Cisco Networking Academy — ICTC

Oct 2025View Credential ↗

wins

ACHIEVEMENTS

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National Top 1.25%

JEE Mains 2022 — top 15,000 of 1,200,000 candidates

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NSERC Internship

Secured competitive federal research grant internship in cybersecurity

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CTF — 70th Global

Dal CTF 2026 · 2,200+ points · 5th at Dalhousie · 70th worldwide

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TryHackMe Top 15%

Global ranking among active cybersecurity practitioners worldwide

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Bronze Medal

All India Roller Skating Competition

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Gold Prize

Multiple School-Level Roller Skating Championships

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2nd Place

School-Level Science Model Competition

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Team Captain

Led School Soccer Team to State-Level Championships

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1K+ Users

Movie website reaching 1,000+ monthly visitors

open source

GITHUB ACTIVITY

Ranjeet Gujjar GitHub contribution graph

CONTRIBUTIONS HEATMAP ACTIVE REPOSITORIES OPEN SOURCE

💻 VIEW FULL GITHUB PROFILE ↗