Jesus Valera Reales

Jesus Valera Reales

Senior Software Engineer passionate about clean code, architecture, and sharing knowledge through technology.

Berlin, Germany · GitHub · LinkedIn

About Me

8+ years of experience building scalable, maintainable systems, with a strong focus on clean architecture, test-driven development, and long-term code quality

Leverages modern AI development tools to enhance productivity, accelerate problem-solving, and design more robust, adaptable systems

Passionate about mentorship and knowledge sharing, with experience guiding engineers and speaking at public conferences on technical topics

Active contributor to open-source projects, continuously sharing insights and building tools that support the broader developer community

Collaborative and product-minded engineer who values clear communication, ownership, and delivering reliable, high-quality solutions that create real impact

Skills

Programming Languages & Frameworks

Java Kotlin PHP TypeScript JavaScript
Deno Symfony Laravel VueJS Android

Databases & Storage

MySQL PostgreSQL Redis

Tools & Platforms

AWS Docker Git Atlassian

Experience

Current

GotPhoto.com | fotograf.de

Senior Backend Developer
Sep 2023 — Present · 2 yrs 11 mos Berlin, Germany (hybrid)
  • Improved the legacy shop's package customization flow, optimizing usability and business logic, leading the development of a key feature that increased the order rate by 20% while reducing bugs and support overhead
  • Redesigned and rebuilt a new shop from scratch using Symfony, implementing a RESTful API architecture, which significantly improved performance, scalability, and long-term maintainability
  • Extracted components from the monolith into external services, improving maintainability and drastically reducing deployment time from 30 minutes to 40 seconds
  • Made extensive daily use of AI development tools, applying them to experimentation, analysis, and solution design, and promoting best practices within the team to enhance productivity and technical outcomes
  • Mentored new team joiners, guiding them through team ceremonies, knowledge-sharing practices, and technical workflows, enabling faster onboarding and more effective collaboration
TypeScript Deno PHP Symfony MySQL Docker GitLab Jira

ArtNight

Middle Backend Developer
Oct 2021 — May 2023 · (1 yr 8 mos) Berlin, Germany (hybrid)
  • Refactored the PHP monolith into a modular architecture using Hexagonal Architecture, improving maintainability, scalability, and long-term evolvability of the codebase
  • Actively reviewed and influenced architectural decisions, balancing business constraints with technical quality and sustainability
  • Led by example in code reviews and refactoring initiatives, raising overall code quality and reducing technical debt
  • Promoted best practices by organizing internal tech talks and coding katas, fostering clean code principles and a strong TDD culture across the team
PHP Symfony PimCore Jira MySQL Docker GitLab Jira

Kollex

Junior Backend Developer
Sep 2020 — Sep 2021 · (1 yr 1 mo) Berlin, Germany (hybrid)
  • Read and write files to an AWS S3 bucket, enabling efficient data exchange and integration with external systems
  • Developed and enhanced multiple features, including performance and reliability improvements
PHP Symfony RabbitMQ Jira MySQL PostgreSQL Docker GitHub

Selectra

Junior Backend Developer
Jun 2019 — Sep 2020 · (1 yr 4 mos) Madrid, Spain (onsite)
  • Contributed to multiple projects through bug fixes, feature development, and enhancements
PHP Laravel Redis MySQL Docker Git Trello Basecamp

Smile And Learn

Junior Backend Developer
Nov 2018 — Jun 2019 · (8 mos) Madrid, Spain (onsite)
  • Designed and implemented CSV import and export functionality, along with dynamic PDF generation
PHP Laravel JavaScript VueJS MySQL BitBucket Jira

RAD4M

Intern Android Developer
Mar 2018 — Jun 2018 · (4 mos) Cracow, Poland (onsite)
  • Designed and developed an application from scratch, with persistent storage and third-party APIs
Android Kotlin MySQL Git

Education

CIFP Carlos III

Higher Technician in Web Applications Development
2016 — Jun 2017 Cartagena, Spain
JavaScript PHP MySQL

IES Ginés Pérez Chirinos

Higher Technician in Multi-platform Applications Development
2014 — 2016 Caravaca, Spain
Java Kotlin Android OracleSQL SQLite MongoDB

Languages

Spanish Native
English C1 (Advanced)
German A2 (Basic)

Conferences

IPC 2026 - Berlin

Workshop Leader - Modern PHP in Practice: TDD, Refactoring, and Pair Programming [link]

Speaker - Evolving a Legacy PHP Application: Patterns for Refactoring Success [link]

IPC 2025 - Munich

Workshop Leader - Refactoring Workshop: Modernizing Legacy PHP with Pair Programming [link]

Speaker - From Mess to Maintainable: Real-World PHP Refactoring Techniques [link]

IPC 2025 - Berlin

Speaker - Solving a Testing & Refactoring Kata: Live Coding in Pair/Mob Programming [link]

Projects

Security Scorecard

Instant security audit for Laravel applications

Automated security auditing tool for Laravel applications.

It scans publicly accessible deployments for common security issues such as leaked files, exposed dashboards, missing HTTP security headers, and configuration mistakes, then provides a graded report with clear, actionable remediation steps.

D'Krisna

Beauty and wellness salon in Murcia

Collaborated directly with the client through extensive conversations to understand their vision and business needs. Designed the complete visual identity and user experience from initial concept to final implementation.

Developed a modern, bilingual website featuring integrated booking system and responsive design for enhanced client engagement.

BIP39 Word Selector

An online bidirectional Bitcoin mnemonic tool

Developed a privacy-focused web tool for cryptocurrency enthusiasts working with BIP39 mnemonic phrases. Features bidirectional conversion between words and binary patterns with client-side processing.

Built with vanilla JavaScript ensuring no data storage or tracking for maximum user security.

Phel Lang IntelliJ Plugin

A plugin written in Kotlin for the JetBrains IDE family

Developed a comprehensive IntelliJ IDEA plugin written in Kotlin for Phel functional programming language. Implemented syntax highlighting, code navigation, auto-completion, and error detection features.

Successfully published in JetBrains Marketplace, serving the growing Phel developer community.

Phel Lang

A functional programming language (Lisp dialect) that compiles to PHP

Language Development: Contributed bug fixes, automated test suites, and design improvements to enhance language stability and reliability.

Website Design: Designed and developed the complete project website from scratch with responsive design, documentation, and custom search engine functionality.

Gacela Project

An application that helps you to split your application into different modules

Co-designed and developed Gacela, a comprehensive PHP modular framework for splitting large applications. Implemented core components including dependency resolver, code generator, and event manager system.

Collaborated on design patterns and documentation, promoting clean architecture principles for scalable development.