Portfolio
Selected engagements where engineering judgment paid back the bill
Each case study is told as problem, approach, and outcome. We do not sell stack lists: we sell the decisions that turned constraints into measurable results.
All case studies
Filtered chronologically and by impact. Some clients are named, others stay anonymous when an NDA requires it: the outcome is always real.
- Anonymized client
E-commerce rebuild that recovered EUR 100k/month of lost revenue
Stabilized a checkout pipeline losing ~1,000 orders per month, recovering ~EUR 100k/month in revenue and standardizing engineering quality across three parallel client projects.
- Next.js
- Strapi
- Node.js
- PostgreSQL
- +1
- Public client
RTI Calabria: defacing recovery and server cleanup of a regional news portal
Full server cleanup after a defacing attack: 200+ backdoors identified and removed, malicious 301 redirect neutralized, organic traffic recovered with no permanent SEO penalty.
- WordPress
- PHP
- MySQL
- Docker
- +3
- Cross-client capability
From ad-hoc setup to a reusable platform running 10+ client projects
Standardized infrastructure on a reusable stack: tenant isolation, supply-chain integrity, continuous verification across code, dependencies, runtime, and availability. New client deploys in hours, predictable operating costs, freedom from managed-provider lock-in, designed to scale horizontally.
- Docker Swarm
- Traefik v3
- Cloudflare
- CrowdSec
- +1
- Public client
PD Crotone: institutional website for a provincial political federation, with strict GDPR compliance
An institutional online presence with staff-managed publishing, first-party-only data flows, and a dedicated financial-transparency section: compliance posture documented for the data controller, no intrusive consent prompts for the visitor, and no developer in the loop for day-to-day edits.
- Next.js
- Strapi
- PostgreSQL
- Docker Swarm
- +1
- Public client
FinderLead: lead extraction engine that mapped the entire Italian Amazon seller market
A lead extraction engine that mapped the full base of Italian Amazon sellers from public sources, with sustained throughput, async queue architecture, subscription billing wired through Stripe, and a pipeline ready to extend to new countries.
- Next.js
- BullMQ
- PostgreSQL
- Stripe
- +1
- Public client
IngePro: corporate website for an engineering firm, deployed on proprietary infrastructure
A static-first corporate website with green accessibility and best-practices audits, hosted on the proprietary platform baseline: predictable cost, editorial autonomy, no template-marketplace dependency. Reported as a recent launch with the data we have, not downstream KPIs we don't.
- Next.js
- Strapi
- PostgreSQL
- Docker Swarm
- +1
- Public client
Tutta N'ata Storia: QR-based digital menu accessible in one tap from the table
A QR-driven digital menu with staff-managed content updates, fast mobile-first delivery, and indexed local web presence: no reprints, no developer in the loop, no external platform subscriptions.
- Next.js
- Strapi
- PostgreSQL
- Docker Swarm
- +1
- Public client
Murista: a B2B marketplace for the construction supply chain (currently building)
A three-sided B2B marketplace for the Italian construction supply chain, currently in pre-launch: multilingual coming-soon storefront live for waitlist signups, architecture in place for contractors, suppliers, and carriers, public launch targeted Q3 2026. Reporting on what is built today, not on what isn't yet.
- Next.js
- Strapi
- PostgreSQL
- Docker Swarm
- +1
- Personal product
GenQR: a self-built SaaS QR code generator with public API
A SaaS QR code generator with public REST APIs, consumer-ready documentation, self-service signup, and Stripe-based subscriptions. Built end-to-end in production, reported honestly as an early-stage product.
- Next.js
- PostgreSQL
- Stripe
- Docker Swarm
- Personal product
KrystalCode: this very site
The site you are reading is itself a KrystalCode product: bilingual MDX-based portfolio, dynamic OG images, hosted on the proprietary platform baseline. The same stack we recommend to clients, applied to ourselves.
- Next.js
- MDX
- Docker Swarm
- Traefik
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