Sales & MarTech systems · Lisbon, Portugal
I build connected systems for sales, marketing, and operations, from prospect data and CRM workflows to automation and AI.
I'm Oscar Tellez. I combine hands-on development with sales and marketing experience to build automations, integrations, AI tools, and full-stack apps for go-to-market (GTM) teams.
Experience spanning
development & commercial teams
01 / Selected work
Prospect intelligence, sales-call AI, revenue operations, and marketing analytics, built around the way teams win and serve customers.
Your marketing performance. Your measurement gaps. One clearer picture.
A marketing analytics app bringing order revenue, Google Ads attribution, Meta revenue, and Klaviyo reporting into a shared workspace, with channel views, conversion signals, and data-quality checks.
Explore performance across channels while seeing where missing data limits the picture.
Inside the application
An internal web app connecting client onboarding, Klaviyo data ingestion, revenue tracking, and client-specific pricing with PDF invoices, email templates, and Gmail drafts. An Ozzie assistant adds a conversational way to query performance.
The value: connect the work from onboarding through to billing.
I coded a sales-call transcription system locally, deployed it on a separate remote PC, and connected a Hermes agent to the transcription database for natural-language questions.
The value: help sales teams revisit conversations and retrieve context for follow-up.
Custom Klaviyo integrations for Lightspeed, Mijnwebwinkel, and Logic4. Historical and event-driven synchronization, with client-side tracking to support email marketing workflows.
Have an integration challenge?A scraping and enrichment workflow covering European e-commerce sites. Cleaned, structured prospect data supports outbound targeting, lead qualification, and sales prioritization.
Let's talk about your dataMuch of my work lives inside private business systems. Happy to discuss the architecture, decisions, and implementation in a conversation.
02 / How I help
Connect the work from finding the right prospects to following up, measuring results, and onboarding customers.
“Our tools don't talk to each other.”
Custom API integrations and data pipelines that keep your CRM, softphone, marketing platforms, and business systems in sync.
Python · REST APIs · Google Cloud“Our sales team is buried in admin.”
From prospect enrichment and CRM workflows to onboarding and invoicing, I automate the manual work around your sales process.
Apps Script · JavaScript · n8n“We have data. We need answers.”
Dashboards and AI tools for outreach performance, sales-call knowledge, and marketing results, so teams can find answers and decide what to do next.
SQL · BigQuery · Looker Studio · AI03 / The person behind the systems
Before building tools for teams, I worked in sales, paid media, procurement, and business operations. That context changes how I build.
I've booked appointments across European markets and used outreach data to improve follow-up. That experience shapes how I build: usable prospect data, connected sales tools, and workflows that support the next conversation.
Today, my work through Algomarketing supports Google's event operations in Lisbon, combining Apps Script workflows, data pipelines, lightweight web applications, and AI automation.
Native Spanish · Fluent English · Learning Portuguese
Developer & Delegate Activation Manager
Through Algomarketing, I support Google's event operations by building Apps Script workflows and data pipelines to validate and synchronize event and attendee data. I also develop lightweight internal tools, manage event audience and segmentation, and bring reporting and AI automation into day-to-day processes.
Marketing Automation Developer
Built custom Klaviyo integrations for Lightspeed, Mijnwebwinkel, and Logic4, connecting customer history and events to email marketing workflows. Developed Google Cloud automations, sales intelligence pipelines, and internal tools for onboarding, invoicing, revenue tracking, and performance analytics.
Business Development Representative
Generated appointments across Northern Europe and Spain in English and Spanish, using outreach data to refine sequences and follow-up. Built Looker Studio dashboards for lead quality, hit rates, and no-shows, while improving prospect data and automating softphone reporting.
M.Mgmt. in Agribusiness, Lincoln University (Merit) · B.Sc. in Finance, Universidad Americana
Certifications & continued learning
04 / Let's build something useful
A prospecting bottleneck, disconnected CRM, manual handoff, or data you can't get answers from. Tell me what you're working on.
Hiring for a sales engineering, GTM systems, MarTech, or data automation role?
Get the full CV