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.

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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.

MiddleHouse · Research → Strategy → Execution

MiddleHouse: audience-led marketing, not just design.

As Social Media Coordinator intern, I relaunched the company's Instagram presence from zero: a new content system, pain-point-led messaging across funnel stages, and competitor benchmarking presented to leadership.

What I actually did, hands on

  • Audited the legacy content to find the gaps in consistency, targeting, and messaging.
  • Built a repeatable framework: content tiers, thematic categories, audience needs, and buyer personas to guide planning and production.
  • Created every post and Reel on the new account, shifting messaging from product-led promotion to pain-point-led campaigns.
  • Benchmarked 10+ real-estate brands on positioning and creative, then presented differentiation opportunities.

The strategy came first. The designs were its execution. My role combined audience research, competitive analysis, content planning, creative production and performance reviews—not graphic design alone.

01 · RESEARCHDiagnose the audience

Audited the previous Instagram account, studied competitors and mapped buyer needs and objections.

02 · PLANBuild the content system

Developed three content tiers, themes, buyer personas and pain-point-led messages across funnel stages.

03 · EXECUTE & LEARNTurn insight into campaigns

Created posts and Reels, monitored early account results and refined the approach using performance observations.

Account growth: The relaunched Instagram account reached a follower count 125% higher than the previous account, with 62.5% fewer posts. Comparison reported from the MiddleHouse project.

Below: selected campaign assets demonstrating how research-led messages became creative execution.

Campaign video execution

Short-form campaigns in motion.

Hover over a Reel to see a short, silent looping preview. Tap to preview on mobile, or open the full video. Previews only download when requested.

Watch full Reel ↗
What condo fees buy
Watch full Reel ↗
Planning for a family
Watch full Reel ↗
What makes a home?
Watch full Reel ↗
Renovation decisions
  • Content strategy
  • Social creative
  • Buyer personas
  • Competitive analysis
  • Copywriting

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

Hiring a marketer? Let's talk.

If you're hiring for digital, content, or performance marketing, I'd like fifteen minutes. Call, message, or email, whichever is easiest for you.

Prefer LinkedIn? Find me here.