About Me
Get to know me better
AI Engineer & Full-Stack Developer passionate about turning ideas into complete products and solutions by leveraging the latest technologies. As a freelancer, I have built AI-powered solutions that generated €20,000+ in sales opportunities in under 30 days. I also built a real-time voice AI mobile app from scratch, now published on the App Store with real users.
Outside of work, you’ll usually find me with a guitar in my hands, at the gym, or diving into whatever I’m curious about next.
Work Experience
My professional journey
Founder & Solo Developer
Talq AI
•part-timeBuilt and launched Talq AI, a real-time voice AI mobile app for practicing spoken languages, live on the App Store.
Achievements:
- Independently designed, developed and launched a production AI application end to end: iOS/android app, real-time voice agent, scalable backend infrastructure, database, payments and analytics.
- Built a production real-time AI voice infrastructure, optimizing latency and costs.
- Stack: React Native (Expo, TypeScript), Python, Node.js/Express, Redis, BullMQ, Supabase/PostgreSQL (RLS, pgvector), LiveKit, WebRTC, Docker, GitHub Actions, RevenueCat, Sentry, PostHog, Next.js.
- App Store Link: https://apps.apple.com/es/app/talq-ai-practice-speaking/id6759484419?l=en-GB
AI Solutions & Automation Freelancer
Sergio Medina - AI Automation Systems
•freelanceFounded and operate a freelance consultancy specialising in AI/Software-leveraged solutions focused on business outcomes. One flagship service is the “Deep Personalization Cold Outreach System”, which automates data collection, hyper-personalised content generation, and scaled messaging for lead-engagement optimisation, leveraged in AI.
Achievements:
- Generated €20,000+ in new sales opportunities in under 30 days for a digital growth agency using an AI powered deep personalization cold outreach system that delivered a recurring pipeline of clients.
Education
My academic background
Erasmus+ Exchange Student
KTH Royal Institute of Technology
Computer Science
Achievements & Honors
- ▸Initiated an AI project in collaboration with Ericsson; currently in its early development stage
Bachelor’s Degree in Data Science and Artificial Intelligence
Universidad Politécnica de Madrid
Computer Science
Achievements & Honors
- ▸Awarded Honors in Databases I
IB Diploma
International Baccalaureate
Science and Mathematics
Achievements & Honors
- ▸7/7 Mathematics Analysis and Approaches HL
- ▸7/7 Physics HL
- ▸7/7 Chemistry SL
Featured Projects
Some of my best work
Cold Email Outreach Tool/SaaS (Work in progress)
Platform that automates cold outreach at scale with personalized sequencing and lead management to boost replies and conversions.
Vigil AI - AI Cybersecurity Plugin for IntelliJ/PyCharm
AI-powered code security analysis combining SAST with LLM reasoning to detect and fix complex vulnerabilities.
Skills & Expertise
A comprehensive overview of my technical proficiencies and tools I work with daily
Ai Development
11Ai Tools
8Backend
13Cloud
5Database
5Design
3Devops
8Frontend
7Mobile
3Soft Skills
4Testing
1Tools
3Certifications
Professional credentials and certifications
September 27, 2025
CERTIFICATE
for
Cambridge English: B2 First (FCE)
Internationally recognized certification demonstrating upper-intermediate proficiency in English.
Cambridge English
Get In Touch
Wherever you are in the world, let's work together on your next project.
Contact Information
Phone
+34 682 78 88 22Location
Stockholm, Sweden - from Madrid, Spain
, 
& ☕, by Sergio Medina.