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I will debug and fix your nodejs or typescript backend API
Rodrigo Santos
About this gig
Is your Node.js or TypeScript backend API throwing errors, returning incorrect data, or failing unexpectedly?
I'm a senior backend engineer with 9+ years of software development experience, including maintaining and troubleshooting production systems.
I can help with:
- REST API errors and broken endpoints
- Express, Fastify, and TypeScript bugs
- Authentication, validation, and middleware issues
- Database queries and data handling
- Webhooks and third-party API integrations
- Async processing, workers, and error handling
What you'll receive:
- Investigation and correction of the agreed bug
- Relevant testing to verify the fix
- Updated code or a patch
- A clear explanation of the issue and solution
I focus on identifying the root cause rather than applying temporary workarounds.
Important: Packages cover clearly defined issues in existing applications. New features, major refactoring, infrastructure changes, and unrelated bugs require a custom offer.
Please message me before ordering so we can review the issue and confirm the right package.
Get to know Rodrigo Santos
Rodrigo Santos
Senior Backend Engineer
- FromBrazil
- Member sinceNov 2026
- Avg. response time1 hour
Languages
English, Portuguese
I'm a Senior Backend Engineer with 9+ years of professional software development experience, specializing in Node.js, TypeScript, REST APIs, databases, and integrations.
I've worked on business-critical production systems, solving complex bugs, improving performance, and building reliable backend services.
I focus on understanding the root cause of problems, writing clean and maintainable code, and delivering well-tested solutions. I value clear communication, practical engineering, and getting things done right.
Check rasantos.dev for more details.
Other Software Development Services I Offer
FAQ
What kinds of Node.js and TypeScript bugs can you fix?
I can investigate issues involving REST APIs, Express, Fastify, middleware, authentication, database queries, async processing, webhooks, and third-party integrations.
Do you need access to my source code?
Usually, yes. Repository access or a minimal reproducible example is typically needed to investigate and fix the issue. Please do not send passwords or sensitive credentials in messages.
Can you fix a bug in a large or unfamiliar codebase?
Yes, depending on the issue and the available documentation. Please contact me first so I can assess the scope and confirm whether it fits one of the packages.
Do you work with NestJS?
My strongest production experience is with Express and other Node.js backend frameworks. I can evaluate NestJS issues, but please describe the problem before ordering so I can confirm whether I can help.
Will you deploy the fix to production?
Production deployment is not included by default. I can provide the corrected code, patch, and validation instructions. Deployment assistance can be discussed separately.
What if the problem turns out to be more complex than expected?
I'll explain the findings and discuss the additional work needed before expanding the original scope. Larger changes may require a custom offer.
Do you provide revisions?
Yes. Revisions cover corrections related to the original agreed issue and delivered fix. New features, unrelated bugs, or changes in requirements are outside the revision scope.
Can you guarantee that every bug will be fixed?
Not every issue can be resolved without sufficient access, evidence, or control over external dependencies. I'll assess the issue before accepting the scope and communicate any blockers or limitations as early as possible.
