You will get backend and API bug diagnosis with tested fixes
Project details
I turn reproducible backend and API failures into focused, tested fixes. With 8+ years of software development experience, I work with Python, Go, JavaScript, REST APIs, webhooks, Docker, and automation. You will receive a clear root-cause explanation, a minimal patch or pull request, validation results, and regression coverage according to your selected package. I prioritize safe
changes that solve the reported problem without unnecessary rewrites. Please provide sanitized logs and development or staging access only—never production credentials.
changes that solve the reported problem without unnecessary rewrites. Please provide sanitized logs and development or staging access only—never production credentials.
Programming Languages
JavaScript, Python, GoWhat's included
| Service Tiers |
Starter
$15
|
Standard
$35
|
Advanced
$75
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 days |
Number of Revisions | 1 | 1 | 2 |
Bug Investigation | |||
Fix Documentation | |||
Detailed Code Comments | - |
Frequently asked questions
About Fredy
Golang Backend & AI Automation | Multi-Tenant APIs | n8n Expert
Neiva, Colombia - 4:44 am local time
"I build backend systems and AI agents that automate the boring stuff."
I'm a Golang backend developer specialized in building scalable APIs and AI-powered automation. I help startups and growing companies reduce manual work with custom backend systems and intelligent agents.
What I do:
🥇 Go Backend & API Architecture
- RESTful APIs with clean architecture / hexagonal design
- Multi-tenant SaaS backends with PostgreSQL (pgx)
- JWT authentication, refresh tokens, API keys
- Microservices with Docker and containerized deployments
- High-performance APIs optimized for low latency and reliability
🥇 AI Agents & Automation
- Custom AI agents for data extraction, content generation, and process automation
- RAG (Retrieval-Augmented Generation) systems
- LLM integration (OpenAI, Claude, local models)
- Workflow automation connecting CRMs, ERPs, messaging platforms, and databases
🥇 n8n Workflow Automation
- Custom n8n nodes and workflows for complex business processes
- Hybrid automation: serverless + scheduled + event-driven
- Tool integrations: Shopify, Slack, Telegram, WhatsApp, and custom APIs
Why work with me?
I don't just write code — I solve operational problems. Every project starts with understanding what you need automated and why, then building a system that actually delivers measurable results.
✓ Architecture-first mindset — Your system won't be a pile of spaghetti in 6 months
✓ Pragmatic quality — Clean code, solid tests, clear documentation
✓ Autonomous delivery — I take ownership, you get updates, no micromanagement needed
Let's talk. Send me a message with what you're building and I'll tell you how I'd approach it.
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Overview — Español:
"Construyo sistemas backend y agentes de IA que automatizan lo tedioso."
Soy desarrollador backend especializado en Golang, APIs escalables y automatizaciĂłn con inteligencia artificial. Ayudo a startups y empresas en crecimiento a reducir trabajo manual mediante sistemas backend robustos y agentes inteligentes.
Lo que hago:
🥇 Backend en Go y Arquitectura de APIs
- APIs REST con arquitectura limpia / hexagonal
- Backends multi-tenant con PostgreSQL (pgx)
- AutenticaciĂłn JWT, refresh tokens, API keys
- Microservicios con Docker
- APIs optimizadas para baja latencia y alta confiabilidad
🥇 Agentes de IA y Automatización
- Agentes personalizados de IA para extracciĂłn de datos, generaciĂłn de contenido y automatizaciĂłn
- Sistemas RAG (RecuperaciĂłn Aumentada por GeneraciĂłn)
- IntegraciĂłn con LLMs (OpenAI, Claude, modelos locales)
🥇 Automatización con n8n
- Flujos y nodos personalizados para procesos de negocio complejos
- AutomatizaciĂłn hĂbrida: serverless + programada + por eventos
- Integraciones: Shopify, Slack, Telegram, WhatsApp, y APIs propias
¿Por qué trabajar conmigo?
No solo escribo código — resuelvo problemas operativos. Cada proyecto empieza entendiendo qué necesitas automatizar y por qué, para construir un sistema que entregue resultados medibles.
✓ Prioridad a la arquitectura — Tu sistema no será un espagueti en 6 meses
✓ Calidad pragmática — Código limpio, tests sólidos, documentación clara
✓ Entrega autónoma — Me apropio del proyecto, te reporto, sin microgestión
Háblame. EnvĂame un mensaje contándome quĂ© estás construyendo y te dirĂ© cĂłmo lo abordarĂa.
Steps for completing your project
After purchasing the project, send requirements so Fredy can start the project.
Delivery time starts when Fredy receives requirements from you.
Fredy works on your project following the steps below.
Revisions may occur after the delivery date.
Review and reproduce
I review the source code, logs, environment details, and reproduction steps.
Diagnose the root cause
I trace the failure and identify the smallest safe solution.