01
Lead product teams
I build squads that ship fast without cutting corners. I set priorities, remove blockers, and protect the team's focus.
Performance isn't a technical detail.
It's a business decision.
10+ years turning engineering into revenue. Cut LCP by 62% at Swift/JBS, grew organic traffic by 38%, and lead teams that ship fast with architectural clarity.
−62% LCP at Swift/JBS
+38% organic traffic
6 engineers on the team
Where I deliver impact
- Swift/JBS — global food e-commerce, millions of visits
- B2B SaaS serving 50k+ users
- AWS infrastructure running 24/7
- Generative AI products in real use
Outcome-driven engineering
I'm not a generalist. These are the areas where I deliver real, measurable impact.
02
Scale web applications
React, Next.js, and Node.js at production scale — with architecture that grows without rewrites.
03
Turn performance into revenue
Core Web Vitals, Lighthouse 95+, and technical SEO that directly translate into traffic, conversion, and ranking.
04
Architect for the cloud
Serverless AWS — Lambda, S3, CloudFront — optimized for cost, resilience, and deploy speed.
05
Ship AI in real products
LLMs, RAG, and agents in production flows that solve real user problems — not hackathon demos.
06
Mentor engineers
I grow mid-levels into seniors and seniors into tech leads. I raise the bar and build technical independence.
Engineering that turns into revenue
Faster pages, better rankings, higher conversion. Performance and technical SEO as first-class engineering.
At Swift/JBS, I inherited an e-commerce platform with 8s LCP and Lighthouse below 40. I treated performance as an engineering project — not last-minute polish. The result: −62% LCP, +38% organic traffic, 71% smaller bundle.
01
Core Web Vitals
LCP from 8s to 3s at Swift/JBS. Priority hints, fetchpriority, edge caching, and streaming SSR working together.
02
Lighthouse 95+
Score maintained above 95 in production for consecutive months — not a pretty screenshot from staging.
03
SEO as architecture
URL design, hreflang across 3 languages, canonicalization, dynamic sitemaps and schema.org — SEO built into the code, not bolted on later.
04
Rendering strategy
SSG for the blog, SSR for catalog, ISR for dynamic pages — every route with the strategy that makes sense for the product.
05
Bundle under control
From 1.2MB to 350KB. Code splitting, tree shaking, partial hydration, and RSC as engineering tools — not buzzwords.
06
Revenue impact
−62% LCP translated into +12% conversion on product pages. Performance pays the bills.
−62%
LCP at Swift/JBS
+38%
organic traffic
−71%
bundle size
95+
Lighthouse in production
Leadership & Impact
What I believe about leading engineering
Faster teams, clearer decisions, product that actually moves the needle.
I've worked with tech leads who knew everything about code and nothing about people. I chose a different path. I lead with clarity, context, and one conviction: the team should do the best work of their careers here.
01
Context, not pressure
Engineers deliver better when they understand the why. I share business context, not just tickets.
02
Quality as a contract
Performance budgets, observability, and tests aren't nice-to-haves. They're the contract that keeps the product reliable.
03
Grow leaders
I mentor engineers so they won't need me. The best compliment is when someone from my team becomes a tech lead.
04
Deciding beats perfecting
Perfect architectures don't exist. I prefer to decide fast, document the trade-off, and iterate with data.
05
Engineering serves the product
Technology that doesn't solve a user or business problem is a hobby. Engineering exists to create value.
06
Measure before optimizing
I don't optimize on intuition. Lighthouse, WebPageTest, analytics — numbers decide, not opinions.
The best code is the code the user never notices — because everything just works.
Side projects
Products I built from scratch
Production side projects with generative AI, Next.js, and Prisma.
GoRhema
AI copilot for pastors to prepare biblical sermons with structure, clarity, and pastoral voice. Uses GPT-5 with RAG and fine-tuning techniques to generate editable messages section by section.
Next.jsTailwind CSSPrismaGPT-5RAGFine-tuning
Visit project 
Postia
AI-powered Instagram carousel creator. Describe a topic and get text, images, and design ready to publish. Uses GPT with RAG and fine-tuning for content and Nano Banana for images, with payment integration and direct publishing via Instagram (Meta) API.
Next.jsTailwind CSSPrismaGPTRAGFine-tuningNano BananaMeta API
Visit project Writing
View all articles Articles
Engineering, performance, SEO, AI, architecture and technical leadership — no fluff.
Engineering
Engineering Quality as a Contract, Not an Aspiration
Engineering Quality as a Contract, Not an Aspiration — a deep technical breakdown by Christian Possidonio on engineering, performance, SEO, AI and technical leadership for digital products.
EngineeringReducing Deploy Lead Time Without Breaking Quality
Reducing Deploy Lead Time Without Breaking Quality — a deep technical breakdown by Christian Possidonio on engineering, performance, SEO, AI and technical leadership for digital products.
EngineeringMeasuring Engineering Impact, For Real
Measuring Engineering Impact, For Real — a deep technical breakdown by Christian Possidonio on engineering, performance, SEO, AI and technical leadership for digital products.
Experience
From full-stack developer to Tech Lead at large-scale e-commerce.
Tech Lead
Swift/JBS
I lead a squad of 6 engineers on Swift's e-commerce platform — a food brand under JBS, one of the world's largest food companies. Responsible for architecture, performance, SEO, and product alignment.
- Cut LCP from 8s to 3s (−62%), directly impacting conversion by +12%
- Grew organic traffic by 38% through technical SEO architecture
- Reduced bundle from 1.2MB to 350KB with code splitting and partial hydration
- Grew 2 mid-level engineers into seniors within 18 months
- Implemented performance budgets and an observability culture in the team
Senior Software Engineer
Multiple companies
8+ years as a senior full-stack engineer, building web and mobile apps for startups, scale-ups, and mid-size companies.
- Architected and shipped 15+ React/Next.js applications to production
- Maintained Lighthouse 95+ across 4 different e-commerce products
- Integrated generative AI into support flows, reducing tickets by 40%
- Built mobile apps with React Native for iOS and Android
Full-Stack Developer
Early career
Started with PHP, JavaScript, and WordPress before moving to the React/Node ecosystem.
- Built my first e-commerce sites and learned that performance matters when your site is genuinely slow
- Migrated from WordPress to React — and never looked back
- Discovered that what drives me isn't technology — it's the impact it creates