Enterprise software engineering

Dependable systems for critical operations.

We design, deliver and evolve secure software platforms for financial services, industry and complex enterprise environments. We build resilient financial systems with security, traceability and operational reliability at their core. We modernize critical technology with scalable architecture, disciplined engineering and measurable outcomes.

Java & Spring Python & FastAPI Cloud platforms Security & reliability

Expertise

Built for environments where failure has consequences.

Senior expertise across architecture, backend engineering, cloud platforms, security and production operations.

Bio Code Technology designs and operates custom software for organizations that depend on reliability, security and traceability. Engagements cover architecture, implementation, integration and the controlled evolution of systems in production.

Java & Spring

Spring Boot, Security, Data, and robust microservices architecture.

Python

Django, FastAPI, Data Science, and analytics solutions.

Databases

PostgreSQL, MySQL, MongoDB, Redis, and ElasticSearch.

Cloud AWS

Scalable infrastructure with EC2, S3, RDS, Lambda, and Kubernetes.

Architecture

Clean Architecture, Hexagonal, SOLID, DDD, and CQRS.

DevOps

Automated CI/CD, Docker, Kubernetes, and monitoring.

Algorithms & Data Structures

Binary trees, graphs, sorting, search optimization, and complexity analysis for payment systems.

Programming Logic & Design

Software design patterns, SOLID principles, object-oriented and functional paradigms.

Security Engineering

OAuth2/OIDC, encryption, privacy controls, threat modeling and zero-trust architecture.

Clients

Experience in demanding business contexts.

Work spanning people operations, industrial systems and enterprise automation.

HR Solutions

Development of a robust technological platform for recruitment and hiring management, optimizing workflow and decision-making.

Industrial ERP

Complete ERP ecosystem for a Japanese Multinational in the automotive sector, integrating Java Spring Boot, Python, and React. Process automation and microservices architecture.

Services

Engineering from architecture to operation.

Focused capabilities for organizations modernizing critical software and digital products.

Financial Sector

Secure banking systems, fintechs, and real-time payment processing with high availability.

Healthcare Sector

Electronic health records, telemedicine and hospital management with privacy-aware data handling.

Automotive Sector

IoT for connected vehicles, advanced telemetry, and fleet management with cloud computing.

Automation & ERP

Custom management systems and automation of complex business processes.

Cloud & DevOps

Cloud migration, serverless architectures, and automated deployment pipelines.

Software Architecture

Architecture consulting, legacy refactoring, and implementation of best practices.

Controlled intelligence service

Legal Location & Due Diligence Intelligence

Person-location support for law firms, legal departments and authorized institutions in service of process, case preparation and verified due diligence, using public or duly licensed sources.

Request controls

  • Verified requester and documented lawful purpose
  • Minimum necessary, non-sensitive data
  • Source traceability, access control and audit trail

Coverage and confidence vary by case. No unrestricted surveillance, sensitive-data profiling, harassment support or guaranteed location.

Social Projects

Garage + PortuJava: programming as a path to opportunity.

Two educational platforms united to expand access to programming, technology creation and future-ready skills.

Immersive engineering

Garage — A Silicon Valley Adventure

An immersive journey through Java, algorithms and software engineering, designed to turn technical challenges into practical learning.

Java engineering
Algorithms
Career progression
Practical challenges
Explore Garage
Accessible learning

PortuJava

An accessible introduction to programming through Java, guided challenges and game-based learning for new generations of technology creators.

Programming foundations
Java learning
Game-based practice
Schools and communities

One program, two complementary learning experiences: Garage and PortuJava are designed for underserved communities, public and private schools, municipalities and government programs, supporting children, teenagers and adults as they learn to program and create technology for the present and the future.

Projects

Software with a clear operating purpose.

Production products, reference architectures and educational technology.

High Frequency Trading (HFT) Robots

Research and engineering for algorithmic trading, with explicit risk controls, low-latency execution, observability and deterministic handling of market data.

Algorithmic Trading Forex Low Latency

Bio Code Tech Pay

A financial platform in production with Pix, payments, account operations and governed financial intelligence.

Visit Bio Tech Pay

Santander Pulse

Backoffice system designed for high-volume transaction monitoring and operational efficiency within the banking sector.

View on GitHub

Geo Bank

Location-based banking services integration, offering personalized financial products based on geographical data and user behavior.

View on GitHub

Aurora Bank

Next-generation ledger system ensuring immutable transaction records and enhanced security for digital banking operations.

View on GitHub

Garage — Silicon Valley

A complete course on data structures, algorithms and live coding challenges set in an immersive Silicon Valley adventure. Build mastery through real engineering problems and unlock the next level of your career.

Data Structures Algorithms Live Coding
Play Now

PortuJava

An interactive game for learning Java through programming challenges and practical problem solving.

Java Programming Game-Based Learning
Play PortuJava
Financial platform in production

Bio Code Tech Pay

Pix, payments and financial intelligence on a dedicated product domain.

Platform online — Production

A complete financial product.
Operating in a real environment.

Pix, deposits, restaurant payments and governed financial assistance. The product combines application engineering, security controls, operations and customer experience.

Pix Payments Financial assistant Security controls
Demo — Platform overview
Autoria técnica

Desenvolvido por Cezi Cola

Concepção, arquitetura, implementação e operação do produto financeiro.

Não se tem notícia de outro engenheiro de software que tenha projetado, construído e colocado em produção, 100% sozinho, o sistema financeiro completo de uma Fintech — da contabilidade imutável ao antifraude, da identidade digital à liquidação. Aqui, esse feito é demonstrável ao vivo.

  • Sobrinho de Camilo Cola, fundador da Viação Itapemirim, Ita Bank e Ita Air Lines.
  • Mais de 20 anos em mercado financeiro, fintechs, APIs financeiras, antifraude e pagamentos digitais.
  • Único rosto em destaque, por desenho: decisão técnica e de negócio na mesma cadeira. Os demais nomes são apresentados por função nesta etapa e revelados em diligência.

Uma linguagem de programação se aprende em meses. Uma parte isolada de um software, em semanas. Mas um sistema financeiro inteiro — conta, liquidação, contabilidade, risco, fraude e conformidade, de ponta a ponta — só nasce sólido de quem carrega décadas dentro do mercado. Conhecimento de negócio financeiro não se aprende com menos de 20 anos de área. Não construímos isso com a tecnologia da moda: acumulamos décadas de conhecimento para criar o que se chama Bio Code Tech Pay.

Case Study

ServiceNow integrated with event-driven operations.

A reference architecture connecting operational technology, incident management and automated recovery.

Project Nexus One

Reference architecture for industrial operations

The Challenge: At a Japanese Multinational in the automotive sector, a critical gap existed between OT (Operational Technology) sensors and IT Service Management. Downtime incidents required long manual triage across disconnected operational and IT tools.

The Solution: Designed and architected a Hyper-Automation Ecosystem built on the ServiceNow platform, integrated with a high-performance microservices architecture. This system detects, analyzes, and resolves infrastructure incidents before production stops.

Edge Computing

Python (FastAPI) and Kubernetes for scalable event processing at the edge.

Event Streaming

Apache Kafka (Confluent) for decoupling and backpressure handling.

Orchestration

ServiceNow ITOM, CMDB & Flow Designer as the "Single Pane of Glass".

Infrastructure as Code

Terraform for reproducible, version-controlled infrastructure automation and compliance.

Zero Trust Security

OAuth 2.0 & Mutual TLS (mTLS) for secure MID Server communication.

Resilience Patterns

Circuit Breakers (Resilience4j) protecting ServiceNow APIs from overload.

Core Technologies

Reference stack for transaction processing, ledger integrity, security, observability and resilient financial operations.

Java

Python

Golang

Rust

Spring Boot 3

AWS Cloud

Kubernetes

Apache Kafka

Terraform

gRPC

Consul

NATS

Angular & TypeScript

OpenAPI & REST

PostgreSQL

Redis

OpenSearch

S3 & Data Lake

Double-entry Ledger

Outbox, Inbox & Dedup

Idempotency & Reconciliation

Debezium CDC

Temporal Workflows

Docker

Helm

Argo CD

Istio & mTLS

OAuth 2.0 & OIDC

Vault, KMS & HSM

WAF & SIEM

Immutable Audit Trail

Pix & Open Finance

KYC, AML & Antifraud

PCI Tokenization

OpenTelemetry

Prometheus & Grafana

Loki & Tempo

Backup & Disaster Recovery

GitHub Actions

Testcontainers

Trivy, SBOM & SLSA

Property Tests & TLA+

SLO & Incident Response

Recovery time

Shorter detection-to-recovery cycle

Operational cost

Measured impact and controlled automation

Asset visibility

Unified OT and IT observability

Technical practice

Engineering decisions made visible.

Problem decomposition, implementation and review demonstrated with working code.

HackerRank Challenge: Java Stdin and Stdout II

In this Live coding, I solve the "Java Stdin and Sdout II" challenge from HackerRank in real-time.

What you will learn:

  • How to use Scanner for input handling in Java
  • Managing different data types (int, double, String)
  • Correct pattern for reading lines after numeric input
  • Clean code practices for basic Java I/O

This Coding session is ideal for beginners preparing for technical interviews or anyone wanting to master Java's standard input/output operations.

Challenge Reference:
HackerRank - Java Stdin and Stdout II


HackerRank Challenge: Java Output Formatting

In this Live Coding session, I demonstrate how a Senior Software Engineer approaches and solves the "Java Output Formatting" challenge on HackerRank in real-time.

What you will learn:

  • Advanced string formatting techniques in Java
  • Precision control for numeric output
  • Professional formatting patterns for real-world applications
  • Staff-level problem decomposition and code clarity

Watch how I think through the problem, identify edge cases, and deliver a production-ready solution while explaining architectural decisions and best practices throughout the process.

Challenge Reference:
HackerRank - Java Output Formatting

Specialist

Discuss the problem with the engineer responsible for the solution.

A focused conversation about feasibility, constraints, architecture and delivery.

By appointment only Meeting in Portuguese or English

Align scope, architecture and delivery constraints.

Book a short intro call and get direct guidance on feasibility, trade-offs, delivery plan, and the best technology stack for your business.

Typical intro call: 15–30 minutes
NDA-friendly and enterprise-ready
Cezi Cola, software engineer at Bio Code Technology
Cezi Cola
Senior Software Engineer & Enterprise Architect
Banking, payments, distributed systems, Java, Python, cloud and security.

Contact

Start a technical conversation.

Share the business context, current constraints and the outcome you need.