David Valera Melendez - Senior Full-Stack Developer

Q: Where is David based?

David is based in Maikammer, Germany .

Q: What languages does David speak?

David speaks the following languages: Spanish (Native), German (Advanced), English (Advanced) .

Q: How many years of experience does David have?

David has at least 15 years of experience. During this time, David has worked in at least 7 different roles and for 9 different companies . The average length of individual experience is 2 years and 7 months . Note that David may not have shared all experience and actually has more experience.

Q: What is David's latest experience?

David's most recent position is Senior Full-Stack Developer at AL-KO Geräte GmbH .

Q: What companies has David worked for in recent years?

In recent years, David has worked for AL-KO Geräte GmbH , Deutsche Bahn , ADVOCATE SOFTWARE , and HZD .

Q: Which industries is David most experienced in?

David is most experienced in industries like Banking and Finance , Information Technology (IT) , and Insurance . David also has some experience in Tourism and Hospitality , Retail , and Real Estate .

Q: Which business areas is David most experienced in?

David is most experienced in business areas like Information Technology (IT) , Product Development , and Human Resources (HR) . David also has some experience in Operations .

Q: Which industries has David worked in recently?

David has recently worked in industries like Retail , Information Technology (IT) , and Professional Services .

Q: Which business areas has David worked in recently?

David has recently worked in business areas like Information Technology (IT) , Product Development , and Operations .

Recommended expert

Maikammer, Germany

Experience

Nov 2023 - Present

2 years 5 months

Senior Full-Stack Developer

AL-KO Geräte GmbH

Architected and executed complete enterprise migration of legacy hosting infrastructure to AWS Cloud platform for an international e-commerce network with 22 dedicated online shops.
Optimized and improved existing OXID eShop platform across 22 country-specific domains, significantly improving load speeds and user experience through advanced performance optimization techniques.
Implemented comprehensive AWS infrastructure with CloudFormation for automated deployments, RDS Aurora database clusters, OpenSearch analytics, Docker containerization, and auto-scaling mechanisms for traffic handling.
Developed full-stack solutions with backend PIM/CRM integration for multilingual product management and frontend internationalization with country-specific routing, currency handling, and localized user experiences.
Collaborated in a 6-developer team for an enterprise e-commerce platform serving 22 international markets.
Technologies: AWS CloudFormation, OXID eShop, Docker, RDS Aurora, OpenSearch, Auto-Scaling, PIM/CRM Integration, Internationalization, Performance Optimization, E-Commerce.
Achieved successful architecture and execution of complete enterprise migration and dramatic improvements in load speeds and user experience across all domains.

Sep 2022 - Jun 2023

10 months

Senior Frontend Developer

Deutsche Bahn

Developed an innovative Kanban board system for real-time train status display and management with Angular enterprise architecture.
Built a modern frontend for live tracking of all trains in the German rail network from scratch, handling massive data streams and complex visualization requirements.
Implemented robust fail-safe frontend mechanisms to ensure continuous operation of rail infrastructure with automatic recovery protocols.
Collaborated with a 16-developer team in the Plan Korridor department, maintaining high code quality through comprehensive Jasmine unit tests.
Focused 100% on Angular-based frontend engineering for railway operations and infrastructure management.
Technologies: Angular, TypeScript, Jasmine, Enterprise Architecture, Real-Time Systems, Kanban Boards, Data Visualization, Fail-Safe Systems, Live Tracking.
Delivered enterprise-grade frontend solutions for transport systems with zero critical incidents.

Oct 2021 - Aug 2022

11 months

Senior Software Architect

ADVOCATE SOFTWARE

Led software architecture and served as team lead for a modern cloud-based law firm management platform from scratch using Angular, NestJS, Ionic, and Electron.
Designed an end-to-end encrypted security framework with multi-layer authentication, secure data transmission, and compliance with legal industry standards.
Created elegant UI/UX tailored for attorneys, including a web-based document editor, case management workflows, client portals, and comprehensive firm management tools.
Managed a cross-platform development team of 10 frontend and backend developers to deliver advanced legal software with real-time communication systems.
Implemented internal chat system using @nestjs/websockets for real-time collaboration between attorneys.
Technologies: Angular, NestJS, Ionic, Electron, @nestjs/websockets, TypeScript, Security Frameworks, Cloud Platforms, UI/UX Design.
Successfully delivered the complete law firm management platform and implemented an end-to-end encrypted communications system meeting legal compliance standards.

Jan 2021 - Sep 2021

9 months

Senior Frontend Developer

HZD

Developed high-security frontend applications for government sector clients, including the 'Elster' tax office system, using Angular and Bootstrap CSS with BFSG accessibility compliance.
Built a secure frontend for police authorities enabling encrypted information transmission with multi-layer authentication and advanced privacy measures.
Created frontend interfaces for housing allowance forms, implementing government security standards, encrypted data transmission, and regulatory compliance frameworks.
Ensured highest security clearance levels for sensitive government data, enforcing strict data protection regulations and audit trails.
Technologies: Angular, Bootstrap CSS, TypeScript, BFSG Accessibility, Government Security, Encrypted Transmission, Multi-Layer Authentication, Compliance Frameworks.
Delivered secure tax office and police communication frontends with zero security incidents and full accessibility compliance.

Jan 2020 - Dec 2020

1 year

Senior Full-Stack Developer

BIONTECH

Architected and developed an enterprise CRM management system from scratch with Angular, Bootstrap CSS frontend and Java Spring Boot backend for pharmaceutical operations.
Created comprehensive REST APIs for importing XML documents from SAP, enabling seamless data integration between legacy systems and the new CRM platform.
Built the PharmaPilot system including customer management, invoice processing, order management, and inventory control tailored to pharmaceutical workflows.
Collaborated with a team of 12 senior developers in an agile environment, conducting rigorous code reviews and automated testing.
Designed scalable system architecture for complex pharmaceutical data workflows and regulatory compliance.
Technologies: Angular, Java Spring Boot, Bootstrap CSS, REST APIs, SAP Integration, XML Processing, CI/CD, Agile Development.
Successfully delivered the PharmaPilot CRM system and seamless SAP integration for real-time data synchronization in healthcare operations.

Jan 2017 - Dec 2019

3 years

Full-Stack Developer & UI/UX Designer

CONCEPT STUDIO

Developed secure card ordering frontend with React and Tailwind CSS and Java Spring Boot backend for a banking client.
Built a claims reporting and management system from scratch for an insurance client.
Created an employee management system with Laravel backend and advanced check-in/checkout functionalities for a CRM client.
Implemented technology stack selection, system architecture planning, and scalable NestJS backend on AWS.
Contributed to UI/UX design initiatives and provided Swagger API documentation for all projects.
Technologies: React, Tailwind CSS, Java Spring Boot, NestJS, Laravel, AWS, Docker, MySQL, Swagger, Microservices.
Delivered a scalable microservices architecture on AWS, reducing deployment time by 70% and zero security incidents in production.

Jan 2014 - Dec 2016

3 years

Full-Stack Developer

IT-CAP STUDIO

Developed a comprehensive travel booking platform with Laravel backend and Angular frontend featuring advanced reservation management, hotel listings, and booking workflows.
Created professional UI/UX designs and responsive interfaces for travel agency platforms.
Built mobile applications with Ionic framework for cross-platform booking functionalities.
Integrated third-party APIs for hotel listings, flight bookings, and real-time price updates.
Optimized database performance for complex booking queries and multi-criteria search operations.
Technologies: Laravel, Angular, PHP, JavaScript, MySQL, Ionic, HTML5, CSS3, Bootstrap, REST APIs.
Improved booking conversion rates by 60% and reduced booking errors by 80% through automated test frameworks.

Jan 2012 - Nov 2013

1 year 11 months

Java Backend Developer

United Realty Ltd

Developed backend systems with Java and Spring Framework for enterprise real estate management platforms.
Built RESTful APIs for property listings, price comparison tools, and agent management features.
Implemented MySQL database solutions for real-time market analyses and user management.
Designed scalable architecture for high-volume real estate data processing and integrated MLS and third-party APIs.
Technologies: Java, Spring Framework, MySQL, REST APIs, Hibernate, Maven, Apache Tomcat.
Delivered scalable backend handling 10,000+ listings and improved property search response times by 60%.

Jan 2011 - Dec 2011

1 year

Junior PHP Engineer

INTERBANK

Developed and maintained banking web applications with PHP, MySQL, and JavaScript for secure financial transactions.
Implemented payment processing modules and transaction validation systems for thousands of daily transactions.
Collaborated on database design and optimization for financial data processing and storage.
Ensured compliance with banking security protocols and conducted code reviews.
Technologies: PHP, MySQL, JavaScript, HTML/CSS, Apache, SVN.
Launched secure online banking interfaces processing millions of dollars daily with zero security incidents.

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (4 years), Banking and Finance (4 years), Insurance (3 years), Tourism (3 years), Retail (2.5 years), and Real Estate (2 years).

Information Technology

Banking and Finance

Insurance

Tourism

Retail

Real Estate

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (14.5 years), Product Development (8.5 years), Human Resources (3 years), and Operations (1.5 years).

Information Technology

Product Development

Human Resources

Operations

Summary

Comprehensive summary of my 10+ years of experience in developing enterprise applications, cloud migration, and team leadership as a Senior Full-Stack Developer.

Skills

My Development Approach Is Based On Proven Software Development Principles And Modern Technologies. I Place Great Value On Clean Code, Test-driven Development, And Continuous Integration.

Agile Development With Scrum/kanban
Test-driven Development (Tdd)
Clean Code Principles
Microservices Architecture
Devops And Ci/cd
Code Reviews And Pair Programming

Languages

Spanish

Native

German

Advanced

English

Advanced

Profile

Created

August 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is David based?

David is based in Maikammer, Germany.

What languages does David speak?

David speaks the following languages: Spanish (Native), German (Advanced), English (Advanced).

How many years of experience does David have?

David has at least 15 years of experience. During this time, David has worked in at least 7 different roles and for 9 different companies. The average length of individual experience is 2 years and 7 months. Note that David may not have shared all experience and actually has more experience.

What roles would David be best suited for?

Based on recent experience, David would be well-suited for roles such as: Senior Full-Stack Developer, Senior Frontend Developer, Senior Software Architect.

What is David's latest experience?

David's most recent position is Senior Full-Stack Developer at AL-KO Geräte GmbH.

What companies has David worked for in recent years?

In recent years, David has worked for AL-KO Geräte GmbH, Deutsche Bahn, ADVOCATE SOFTWARE, and HZD.

Which industries is David most experienced in?

David is most experienced in industries like Banking and Finance, Information Technology (IT), and Insurance. David also has some experience in Tourism and Hospitality, Retail, and Real Estate.

Which business areas is David most experienced in?

David is most experienced in business areas like Information Technology (IT), Product Development, and Human Resources (HR). David also has some experience in Operations.

Which industries has David worked in recently?

David has recently worked in industries like Retail, Information Technology (IT), and Professional Services.

Which business areas has David worked in recently?

David has recently worked in business areas like Information Technology (IT), Product Development, and Operations.

What is the availability of David?

David is immediately available for suitable projects.

What is the rate of David?

David's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.