Digital Marketer · Social Media Coordinator · Toronto

I learn marketing by building it.

Hey! I'm Robert, a digital marketer with hands-on experience in organic content, social media, and paid campaigns. I combine creative strategy, audience research, analytics, and AI-powered tools to turn ideas into measurable marketing work.

Portrait of Robert Mark Arnob D' Costa

What I'm building now

Market58, with AudienceLab.

Market58 is a social listening and market research app I built to give small businesses the kind of audience intelligence usually reserved for big budgets. It collects public conversations from YouTube and Google Search and imports discussions from other platforms, including Reddit, then classifies records by sentiment, intent, and funnel stage.

AudienceLab is the newest part: it turns that classified conversation data into audience personas, and then into synthetic interviews, so you can pressure-test messaging before spending a dollar of media.

Why this is a marketing project, not just a coding project

  • Designed the pipeline like a researcher: collect, classify, then decide.
  • Built the collector plugins myself, including a platform-neutral CSV importer for community discussions.
  • Structured the rebuild on a modular plugin architecture, so new sources plug in without rewrites.
  • Designed for repeatable analysis: local evidence storage, caching, evidence export, and structured reports make the workflow easier to audit.

I have written about the build on LinkedIn, including a project section with two posts walking through it.

  • Audience research
  • Social listening
  • Sentiment & intent classification
  • Persona building
  • Python
  • Product thinking
M58
AUDIENCE INTELLIGENCE

Market58

●   LIVE INTERACTIVE WALKTHROUGH · OFFLINEExpand ↗

Public-conversation research, evidence classification, customer pain points, funnel strategy and documented insights — demonstrated with a real Ridgeway Cargo research run.

725records collected430analyzed in report3source platforms

Original Streamlit workflow recreated in-browser using saved data. Not a live classification run.

◈
SYNTHETIC PERSONA RESEARCH

AudienceLab

●   LIVE INTERACTIVE WALKTHROUGH · OFFLINEExpand ↗

Research-grounded fictional audience personas, a reactive emotional avatar, and structured AI-assisted interviews. Explore Alex's saved interview with real recorded VAD changes.

4selected real exchangesVADemotion animation0new AI calls

Original HTML/CSS/SVG interface retained. The showcased participant is synthetic, not a real customer.

Where I've worked

Hands on, in more than one seat.

  • May 2026 – Aug 2026
    MiddleHouse Developments ↗ — Social Media Coordinator Intern, TorontoRelaunched the Instagram presence; built the content strategy, framework, and creative system.
  • Oct 2026 – Present
    ScubaSeasons ↗ — Marketing ApprenticeAudience research across large scuba communities: engagement patterns, pain points, and opportunity lanes.
  • Jan 2023 – Dec 2023
    DataPath Ltd — BPO Executive, Analytics, DhakaAdvanced Excel reporting and analysis across 100+ U.S. client portfolios; direct client communication on data issues.

Toolkit

  • Meta Ads
  • Google Analytics
  • Content strategy
  • Audience research
  • Copywriting
  • Python (Pandas)
  • SQL
  • Advanced Excel
  • Canva
  • Affinity Designer & Photo

Certified: HubSpot Social Media Marketing Certification, IBM Data Science Professional Certificate, Data Analysis with Python, Using Python to Access Web Data.

Education: Master of Management, Trent University.

What I do, hands on

The work, by craft.

Everything below is work I have actually done, not coursework. Each craft maps to the core of professional marketing roles: planning, executing, measuring, and learning.

Campaign planning and execution

  • Planned, launched, and optimized a Meta and Instagram traffic campaign end to end: audience approach, creative, copy, landing destination, and performance monitoring.
  • Relaunched a company's Instagram presence from zero as Social Media Coordinator intern: content system, pain-point-led messaging across funnel stages, competitor benchmarking presented to leadership.

Performance analytics

  • Read campaign data like a marketer: creative performance, audience response, and traffic quality, then optimized from what the numbers said.
  • Advanced Excel, Python (Pandas), and SQL from analytics work across 100+ U.S. client portfolios, with direct client communication on data issues.

Audience research and content strategy

  • Built Market58, a social listening app that classifies public conversations by sentiment, intent, and funnel stage, plus AudienceLab for personas and synthetic interviews.
  • Ran audience research across large scuba communities as a marketing apprentice: engagement patterns, pain points, and opportunity lanes.
  • Built a repeatable content framework (tiers, themes, audience needs, personas) to guide planning, production, and measurement.

Independent design practice

Creative concepts and visual experiments.

A few selected pieces from my earlier portfolio. These are design exercises, separate from the paid-media performance results above.

Independent design concept: Food campaign concept
Food campaign concept
Independent design concept: Consumer product concept
Consumer product concept
Independent design concept: Coffee concept
Coffee concept
Independent design concept: Lifestyle creative
Lifestyle creative

Verified professional feedback

What people I’ve worked with say.

Direct feedback from my work at MiddleHouse Developments.

Jason Self portrait supplied for portfolio
“Honestly you're (Robert) doing a great job and I would say the most insightful student we've had for this position, so keep up the great work.”

Jason Self ↗ · Co-Founder, MiddleHouse Developments

Let's talk.

Hiring for a marketing role, or just want to talk shop? Call, message, or email, whichever is easiest for you.

Prefer LinkedIn? Find me here.