Harold Tela-Senior Software Developer | OOP . Full Stack . Cloud-Native
Check rate
Experience
CPU Watcher — Cloud-Native Monitoring Application
SEUYTEL
Developed a CPU monitoring application using Spring Boot and React, containerized with Docker Compose, with automated infrastructure provisioning using Terraform on AWS.
Stack: Spring Boot, React, PostgreSQL, REST API, Docker Compose, Terraform, AWS
Main Events — Mobile & Web Platform
SEUYTEL
Contributed to the development and release of a mobile application, as well as its associated React.js websites, and set up the server environment.
Stack: React Native, React.js, REST API, Ubuntu, Server Administration, Laravel, PostgresSQL, GIT, CI/CD
Co-Founder / Software Developer
SEUYTEL
- Contributed to the design, development, and release of Main Events, a mobile application and associated websites.
- Contributed to the design, development, and publishing of SEUYTEL React.js websites.
- Configured and administered a GDPR-compliant on-premises cloud infrastructure for SEUYTEL.
- Assisted with the technical and organizational management of the company.
BTB Database — ERP System
Fraunhofer
Independently designed and developed a modern ERP system at Fraunhofer, including the migration from Microsoft Access to PostgreSQL and the development of both the backend and frontend.
Stack: Laravel, React, PostgreSQL, REST API, SAP, Ubuntu, Git
Software Developer
Fraunhofer IST
- Migrated an existing Microsoft Access database to PostgreSQL, including the transfer and adaptation of existing data structures.
- Designed and developed a backend system using Laravel.
- Designed and developed a React-based frontend.
- Implemented SSO authentication based on a SAP smart card.
- Developed and worked in a controlled corporate environment handling sensitive business and personal data in compliance with applicable data protection and security requirements.
- Independently handled development, documentation, and technical coordination tasks.
IT Technician
Freelancer
- Conducted IT infrastructure projects across two locations of a major retail chain.
- Installed and commissioned wireless access points.
- Verified network connectivity and the proper operation of installed components.
- Independently performed on-site technical work in accordance with defined project requirements.
EstateNews — Native Android Application
SEUYTEL
Developed a native Android application using Kotlin and MVVM, along with a Laravel backend featuring a REST API and MySQL database.
Stack: Kotlin, Android, MVVM, Laravel, REST API, MySQL, GIT
Independent Software Development
EstateNews
- Planned and independently executed a personal software project.
- Designed and independently developed a native Android application using Kotlin.
- Developed a PHP-based REST backend for providing and processing application data.
- Integrated and managed a MySQL database.
- Implemented the MVVM architecture and developed the application's user interface.
- Implemented features including user authentication, radius-based search, Google Maps integration, content filtering, and favorites management.
- Independently managed the project from initial concept through development and technical integration.
First & Second Level Support / IT Support
Wertgarantie
- Provided first- and second-level customer support via phone and email.
- Analyzed and resolved technical inquiries and escalated complex issues to the appropriate departments.
- Contributed to the rollout of newly developed software.
- Performed testing and evaluated the software from an end-user perspective.
- Collected, documented, and systematically communicated customer feedback and improvement suggestions to the development team.
- Worked in a regulated insurance environment, handling personal customer data in accordance with applicable data protection and security requirements.
Data Entry / Data Processing
Wertgarantie
- Entered and maintained contract and customer data in internal systems.
- Processed and reviewed incoming signed contracts.
- Handled personal and confidential customer data carefully within a regulated corporate environment.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Insurance, and Retail.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Operations, Project Management, Customer Service, and Quality Assurance.
Summary
Software developer with hands-on experience in developing full-stack, backend, and modern enterprise applications, as well as mobile applications. Solid knowledge of Java, Kotlin, JavaScript/TypeScript, and PHP, and of frameworks such as Spring Boot, Laravel, React, and React Native. Experience building REST APIs, connecting and migrating databases, and working with containerization, for example with Docker, as well as implementing CI/CD and IaC solutions. Independent, solution-oriented working style with experience delivering technical projects and working in different IT environments.
Skills
- Backend Development: Spring Boot · Spring · Laravel · Rest Apis · Hibernate/Jpa · Microservices
- Frontend & Mobile Development: React · React Native · Android Xml · Html · Css
- Databases: Postgresql · Mysql
- Cloud & Devops: Docker · Kubernetes · Terraform · Aws · Ci/Cd · Docker Compose · Nginx
- Architectures & Design Patterns: Mvc · Mvvm · Microservices · Rest · System Design · Authentication & Authorization
- Networking & Infrastructure: Nat · Gateways · Network Configuration · Network Components · Ssh
- Development Tools: Claude Code · Git · Gradle · Maven · Composer · Android Studio · Vs Code · Eclipse · Jira · Confluence · Pgadmin
- Systems: Ubuntu · Windows
Languages
Education
Technische Universität Braunschweig
No degree · Computer Science · Braunschweig, Germany
Bilingual Gymnasium Gouache
Abitur · Science
Certifications & licenses
Cloud Practitioner Essentials
AWS
Full-Stack Web Developer
Udemy
Kotlin Android Developer
Udemy
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Harold is based in Braunschweig, Germany and can operate in on-site, hybrid, and remote work models.
Harold speaks the following languages: French (Native), German (Advanced), English (Advanced).
Harold has at least 4 years of experience. During this time, Harold has worked in at least 10 different roles and for 6 different companies. The average length of individual experience is 5 months. Note that Harold may not have shared all experience and actually has more experience.
Based on recent experience, Harold would be well-suited for roles such as: CPU Watcher — Cloud-Native Monitoring Application, Main Events — Mobile & Web Platform, Co-Founder / Software Developer.
Harold's most recent position is CPU Watcher — Cloud-Native Monitoring Application at SEUYTEL.
In recent years, Harold has worked for SEUYTEL, Fraunhofer, Fraunhofer IST, Freelancer, and EstateNews.
Harold is most experienced in industries like Information Technology, Insurance, and Retail.
Harold is most experienced in business areas like Information Technology, Product Development, and Operations. Harold also has some experience in Project Management, Customer Service, and Quality Assurance.
Harold attended Technische Universität Braunschweig for Computer Science.
Harold has 3 certificates. These include: Cloud Practitioner Essentials, Full-Stack Web Developer, and Kotlin Android Developer.
Harold is immediately available full-time for suitable projects.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
Similar freelancers
Discover other experts with similar qualifications and experience
Ornel Franck Wora Yeno
Thomas Hoefkens
Thomas Stägemann
Stefan Hess
Stefan Baust
Jan Lüders
Laurin Hagemann
Thorsten Matzner
Pierre Fokom
Max Rosari
Experts recently working on similar projects
Freelancers with hands-on experience in comparable project as a CPU Watcher — Cloud-Native Monitoring Application
Achille Chimi
Santhosh Kannan
Shamaila Mahmood
Niko Schmuck
Christian Hartmann
Robin Sadlo
Tymofii Sukhachov
Arne Hendricks
Simona Thrussell
Ramazan Cinardere
Nearby freelancers
Professionals working in or nearby Braunschweig, Germany
Onur Kayir
Bastian Vasterling
Ajay Chodankar
Tobias Mönch
Jens Henneberg
Houssem Ben Zid
Sandra Klinkenberg
Viola Klingspohn
Priyanka Sarang
Alexander Naumann
