Front-End & Back-End Engineering

Web development agency in Barcelona for companies.

53% of mobile users abandon a site if latency exceeds 3 seconds. A slow infrastructure, without SEO optimization and vulnerable, is not a sales tool, it is a corporate liability. We build ultra-fast platforms, secure under the OWASP standard, and ready to scale. From €899.

⚡ Green Core Web Vitals 🔒 Integrated OWASP security 📊 Technical SEO architecture
Software Architecture

Web development with engineering standards

We don't use heavy pre-made templates that sink performance. We build from scratch or refactor your current platform. Every project follows a strict lifecycle (SDLC): business analysis, data architecture design, and development with clean, secure code.

The result is a digital asset prepared to withstand traffic spikes, index aggressively on Google, and pass corporate cybersecurity audits without early refactoring.

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Corporate Web
Solid, ultra-fast digital presence oriented toward institutional capture and reputation.
B2B / B2C E-commerce
Secure transactional architecture with inventory management, integrations, and shielded gateways.
Platform / Web Portal
Complex applications with custom business logic, private areas, and analytical dashboards.
Conversion Landing
Hyper-optimized sales funnels to maximize ROI in advertising campaigns.
Bottleneck Identification

Your current infrastructure penalizes you if...

1 It loads in more than 3 seconds (high Time to Interactive), skyrocketing mobile bounce rate.
2 It suffers from technical debt: legacy code prevents ranking organically in relevant searches.
3 The user interface (UI/UX) is obsolete and damages credibility against competitors.
4 The E-commerce sales funnel generates friction, abandoned carts, or database crashes.
5 You start a new business model and demand a technological base that scales without needing a rebuild in 6 months.
Infrastructure Evaluation
  • Latency, Core Web Vitals, and vulnerability analysis.
  • Diagnosis: Refactor or rebuild from scratch?
  • Fixed technical quote, no hidden deviations.
  • 30-minute strategic consultation with no obligation.
Request web diagnosis →
The cost of technical debt

A poor website is not neutral —
it actively destroys your bottom line.

Latency = Lead Leak

53% of users abandon at 3 seconds. Amazon calculated that a 1-second delay costs 7% in conversions. Speed is revenue.

🔍
Algorithmic Penalty

Google penalizes indexations with poor performance (Mobile-First Indexing). Failing Vitals metrics means being invisible to the search market.

🔒
Loss of Trust

A misconfigured certificate or vulnerability breach generates "Not Secure" warnings in browsers, instantly annihilating brand reputation.

SDLC Methodology

Secure Development Cycle

No surprises, no toxic dependencies, and unmovable delivery dates. We document and validate every phase of the deployment.

01

Requirements Analysis

Requirements engineering to understand the business model, expected transactional load, and define the optimal Tech Stack.

Briefing Scope SLA
02

Architecture and Wireframes

Prototyping of the User Interface (UI) and database diagram design before writing the first line of code.

Figma UX/UI DB
03

Secure Development

Building with clean code, integrating OWASP security controls from the programming phase, not as an afterthought.

Frontend Backend OWASP
04

WPO and Testing

Web Performance Optimization. Asset minification, advanced compression, and Core Web Vitals audit.

Lighthouse PageSpeed WPO
05

Pre-Deployment Audit

Final quality control: review of security HTTP headers, SSL/TLS certificates, and shielding of critical directories and panels.

HTTP Headers SSL Labs QA
06

Go-Live

Deployment in the final environment, active monitoring for the first 48h, delivery of technical documentation, and operational training session.

Deployment Training Docs
Tech Stack

Tools and Frameworks

We select technology for its performance and security, not for trends. We avoid over-engineering to drastically reduce the attack surface.

Frontend
🌐
HTML5 / CSS3
Strict semantics, accessibility (a11y), and client-side rendering performance.
JavaScript / React
Reactive interactivity without heavy libraries (jQuery) that degrade TTI.
🎨
Figma
High-fidelity prototyping and usability validation prior to development.
Backend & CMS
🔧
PHP 8+ / Node.js
Robust server logic with strict validation against injections.
🗄️
MySQL / PostgreSQL
Efficient relational design with parameterized statements and queries.
📝
WordPress Hardened
Shielded core, minimal plugin use, and secured REST API for management.
Infrastructure
🖥️
Nginx / Apache
Tuned web servers with caching directives and basic DDoS mitigation.
🔒
Advanced SSL
Robust cryptography (TLS 1.3), HSTS policies, and mandatory encryption in transit.
📦
Git CI/CD
Strict version control and continuous deployment without interruptions.
Telemetry and SEO
🚀
Lighthouse
Continuous audit of accessibility, development best practices, and technical SEO.
📊
Web Vitals
Monitoring of LCP, FID, and CLS to guarantee a top user experience.
🔍
Schema Markup
Structured data markup (JSON-LD) to dominate Google Rich Snippets.
WE ANSWER YOUR QUESTIONS

Frequently Asked Questions

We generally work with a model of 50% at the start of the project to reserve development hours, and the remaining 50% upon final delivery and deployment.

No. Our quotes are fixed. You will only have to cover the standard external costs of any website (your domain and hosting server), which will always be in your name.

The prices shown are starting points based on common architectures. If you need complex integrations, ERPs, or custom web applications, we will evaluate the technical scope and provide an exact quote.

The base price covers scoped perimeters (e.g., a main domain or a limited number of IPs). We evaluate the size of your infrastructure and confirm if it fits the base rate or requires a custom quote.

Yes, we sign an NDA before exchanging any technical information to guarantee the complete privacy of your infrastructure and source code.

No. Our goal is to evaluate security, not disrupt your service. Simulated attacks are performed in a controlled and agreed-upon manner.

We deliver an executive report for management and a detailed technical report with the attack chain, evidence, and exact recommendations to patch the vulnerabilities.

Yes. We offer maintenance plans to ensure your system, website, or AI integrations continue to function securely and stay up-to-date over time.

Ready to scale?

Let's build a fast, secure,
and profitable platform.

Send us an outline of your requirements. Our technical team will evaluate viability and deliver an architectural proposal in less than 24 hours.