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Fiverr Pro
English
$
USD
I will build and fix custom software applications
Zack D
About this gig
Need custom software built, repaired, or improved? I provide practical software development tailored to your requirementsfrom focused bug fixes to new features, integrations, prototypes, and small applications.
Services include:
Custom software and web application development
Bug diagnosis and repair
New features and enhancements
REST API and third-party service integrations
Backend, database, and automation development
Code refactoring and performance improvements
Salesforce and Apex development
I work with Python, C#, Java, Kotlin, Apex, TypeScript, JavaScript, HTML/CSS, Bash, and PowerShell. My framework experience includes React, Next.js, Angular, Vue, Tailwind CSS, Django, FastAPI, Spring, Ktor, and NestJS.
Every delivery includes the completed source code, testing of the agreed functionality, and helpful comments for non-obvious logic. Formal developer documentation and handoff guidance are also available as an extra.
Please message me before ordering. Software projects vary considerably, so I will review your requirements, confirm the appropriate package, and identify anything that requires a custom offer.
Lets turn your requirements into clean, maintainable software.
Get to know Zack D
Zack D
Full Stack Application Dev
- FromUnited States
- Member sinceJun 2025
- Avg. response time1 hour
Languages
English
I build custom applications and databases for clients who need practical software that solves real business problems. My work includes C#/.NET, Java, Python, SQL, REST APIs, automation scripts, database design, bug fixing, and application improvements. I’m especially useful when you need someone who can understand the goal, design a clean solution, explain the tradeoffs, and deliver maintainable software without unnecessary complexity.
FAQ
Should I contact you before placing an order?
Yes. Please send your requirements, technology stack, deadline, and any relevant files first. I will confirm the correct package or prepare a custom offer.
What information do you need to begin?
Please provide a clear description of the requested outcome, existing source code if applicable, error messages, steps to reproduce bugs, and any technical or design requirements.
Can you work with an existing codebase?
Yes. I can diagnose bugs, implement features, refactor code, improve performance, and integrate APIs. I may need to inspect the project before confirming the scope.
Is source code included?
Yes. New development includes the completed source code. For existing projects, I will return the modified files or agreed code changes. Third-party components remain subject to their licenses.
What counts as a revision?
A revision is a correction or adjustment within the original requirements. New features, changed requirements, additional integrations, or expanded functionality require a custom offer.
Do you provide documentation?
All packages include helpful comments for non-obvious logic. A structured README with setup, configuration, dependencies, architecture, and maintenance guidance is available as an extra.
Which technologies can you work with?
I work with Python, C#, Java, Kotlin, Apex, TypeScript, JavaScript, HTML/CSS, Bash, and PowerShell, along with several modern frontend and backend frameworks. Please contact me to confirm your specific stack.
Do you use AI development tools?
I don't "vibe code," blindly using AI to write for me. I will use it for reference such as explaining a bug or to get details on a method or API I am unfamiliar with, but LLM hallucinations are too unreliable to write unchecked code.
Can you guarantee that every bug will be fixed?
I guarantee a structured investigation and clear communication. Some issues depend on unavailable systems, third-party services, incomplete source code, or access limitations. I will explain any blocker I discover.
Do you provide support after delivery?
I will correct verified defects in the delivered work during the agreed support period. New requests or changes outside the original scope are quoted separately.
