Flagship Production Platforms

Designed, Built & Operated by The BitCrafters

Pacto

Zero-Knowledge LegalTech

Privacy-first digital contract generator and electronic signature engine for Spain, operating on a transparent 0,99 € pay-per-document model.

•

Client-Side Encryption: WebCrypto AES-GCM-256 executes in the browser; legal text is never stored in plaintext on servers.

•

Regulatory Compliance: Built to satisfy EU eIDAS Regulation (910/2014 Art. 25) and the Spanish Civil Code.

•

Cryptographic Audit Seals: RFC 3161 digital timestamping with SHA-256 integrity hashes for legal validity.

TypeScript Next.js 15 React 19 WebCrypto API Tailwind CSS Vercel

FuelFlow

Geospatial Intelligence

fuel.thebitcrafters.com ↗

Automated energy intelligence radar aggregating, reconciling, and comparing fuel pricing across 11,200+ service stations in Spain.

•

Automated Ingestion: Continuous 30-minute ingestion cycles scraping national open-data feeds across all 11,200+ stations.

•

Sub-14ms Spatial Queries: PostgreSQL PostGIS spatial indexing paired with an in-memory Geohash-6 cache layer.

•

Route Margin Analysis: Dynamic computation of station margin spreads and optimal fuel stops along transit corridors.

Java 21 Spring Boot 3.4 PostgreSQL PostGIS Redis MapLibre Docker

Enterprise Engineering Track

Denis Casian Balosin · Foundation & Experience

Senior Software Engineer & Scrum Master

ING Spain · International Payments & Core Banking Platforms

2022 — Present · Madrid, Spain

Distributed Architecture: Engineering and scaling mission-critical microservices in Java and Spring Boot across high-availability banking environments.
Financial Standards & Compliance: Contributing to European payment regulatory frameworks (PSD2, European Central Bank) and ISO 20022 messaging standards.
Agile Squad Leadership: Certified Scrum Master facilitating sprint roadmaps, unblocking dependencies, mentoring team members, and ensuring zero-downtime releases.
Cloud-Native Engineering: Delivering containerized services using Docker and Kubernetes with automated CI/CD deployment pipelines.

Java 21 Spring Boot Microservices ISO 20022 PSD2 Docker Kubernetes Scrum Master

Software Engineer

Palco4 · High-Concurrency Infrastructure & Flash Surges

2021 — 2022 · Madrid, Spain

Flash-Crowd Concurrency: Engineered virtual waiting rooms and Redis distributed mutexes supporting 150,000+ simultaneous users during stadium concert on-sales with zero inventory double-bookings.
Database Protection: Implemented asynchronous queue buffering decoupling traffic stampedes from PostgreSQL connection pools, preventing database starvation.
Latency Optimization: Optimized seat-map query indexing, serialization pipelines, and caching layers to sustain sub-20ms p95 latency targets during peak on-sale windows.

Node.js Redis Cluster Distributed Locks PostgreSQL Async Queues AWS High Concurrency

Studio Principles

How The BitCrafters Builds Software

01 / PRODUCTION

Zero Toy Code

Every platform we engineer operates live with real users, verified compliance, and real unit economics.

02 / RESILIENCE

Survive Concurrency

Systems designed to withstand sudden flash crowds, network partitions, and traffic stampedes without data loss.

03 / PRIVACY

Zero-Knowledge

Client-side cryptographic encryption whenever sensitive user data is handled. We never store what we don't need.

04 / CRAFT

Sub-50ms Latency

Clean data structures, spatial caching, and optimized pipelines that treat user time as the ultimate constraint.

Engineering resilient systems, high-concurrency backends, and production software.