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Sergi T.
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Sergi T.

Senior Full Stack | Claude Code, Lovable | +100 clients

🏅Top 3% >24months🏆+5000hrs 👌100+ Happy clients. 👷🏾‍♂️ I help startups and tech companies design, build, and scale full-stack applications empowered with latest AI technologies (ClaudeCodex, GithubCopilot) — with a strong focus on clean architecture and cloud deployment FREE CONSULTATION SERVICE I am more than happy to share my years of experience in helping clients build web/mobile applications from the ground up, including but not limited to, setting up MVP, choosing tech stack, scoping out practical plan/timeline, estimating budget, and more. Please send me a message so we can discuss how we can realize your company's true potential!** ✅ WHY WORK WITH ME? ✔ Vast experience in building scalable web applications across various industries. ✔ Specialization in Python, Django, and database management. ✔ Deep knowledge of industry-specific challenges and tailored solutions. ✔ Strong problem-solving skills for tackling complex technical issues. ✔ Proficiency in AWS, Google Cloud, and Microsoft Azure services. ✔ Dedicated to delivering outstanding results and client satisfaction. ✔ Transparent and open communication for seamless collaboration ✔ Effective project management to ensure timely completion. ✔ A dependable and skilled professional committed to realizing your vision. 🛠 𝗦𝗞𝗜𝗟𝗟𝗦 🔸𝗖𝗼𝗿𝗲. Python, NodeJS, Java, C++ 🔸𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀. MySQL, PostgreSQL, SQLAlchemy, pyodbc, MariaDB 🔸𝗡𝗼-𝗦𝗤𝗟. MongoDB, Redis, ElasticSearch 🔸𝗖𝗹𝗼𝘂𝗱. AWS EC2, S3, SES, Route 53, ECS/ECR/EKS, Lambda, GCP GAE, DB, Compute Engine 🔸𝗔𝗣𝗜. Django, FastAPI, Express, NestJS, Flask 🔸 𝐀𝐈 𝐀𝐠𝐞𝐧𝐭𝐬 / 𝐕𝐨𝐢𝐜𝐞 𝐀𝐠𝐞𝐧𝐭𝐬: CrewAI, AutoGen, LangGraph, Semantic Kernel, OpenAI Swarm, OpenAI Assistants API, MCP, Vapi, Retell AI, Bland AI, Synthflow, LiveKit, Pipecat, Amazon Polly 🔸 𝐎𝐩𝐞𝐧-𝐒𝐨𝐮𝐫𝐜𝐞 𝐋𝐋𝐌𝐬: LLaMA 3, Mistral 7B, Mixtral 8×7B, Qwen, DeepSeek, Phi-3, Falcon, Gemma 🔸 𝐂𝐥𝐨𝐬𝐞𝐝 𝐋𝐋𝐌𝐬: GPT-4o, o1, o3, Claude, Gemini, Amazon Bedrock, Cohere

🇪🇸Barcelona, Spain$35/hr100% JSS4.90 (95)Since Aug 2014
GlobeUpwork

Earnings and projects

MRR
$2.1k

Last 6 months ÷ 6

World#21,930 / 412k
🇪🇸Country#243 / 4,023
Revenue, last 30 days
—

Read daily since Nov 3, under 30 days

Total earnings
$250k

Billed in all: $259k

World#10,665 / 412k
🇪🇸Country#149 / 4,023
Per project
$2.3k

$2.5k in the last 6 months

World#69,337 / 412k
🇪🇸Country#647 / 4,023
Projects, last 6 months
5
40% fixed60% hourly
World#41,746 / 412k
🇪🇸Country#343 / 4,023
Projects in all
109

Across 117 contracts

30% fixed70% hourly
World#24,771 / 412k
🇪🇸Country#237 / 4,023

Earnings, last 30 days

$259kNothing earned since Nov 3Billed in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$250k$255k$260k$265kNov 3Nov 5Nov 7

Tracked from Nov 3, 2026.

Skill rankings: Top 4% in Bootstrap

Ranked by MRR among everyone on Upwork with the skill.

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