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BELKO Custom Software Development

Web systems & SaaS · Mobile apps · E-commerce · Cloud architecture

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CHAT ON WHATSAPP SEE SERVICES START A PROJECT

Recruiter? See my technical profile

01

SERVICES

From MVP to enterprise — frontend to backend

A

For companies and tech teams

Architecture, scale and critical systems

  1. Microservices Architecture & AWS Cloud

    Decoupled microservices, RabbitMQ messaging, Docker containers and infrastructure migration to AWS.

    • Docker
    • AWS
    • RabbitMQ
    • Microservices

  2. Multi-tenant SaaS & Corporate Back Office

    Custom multi-tenant SaaS, admin panels, dashboards, granular permissions and reporting.

    • React
    • NestJS
    • PostgreSQL

  3. Complex APIs & Payment Gateways

    Integration of complex APIs and payment gateways, robust REST and gRPC APIs, connections to ERPs and legacy systems.

    • NestJS
    • REST
    • gRPC
    • Stripe

  4. iGaming Platforms & Financial Systems

    Player site, back office, digital wallets, financial reconciliation, withdrawal and deposit APIs, KYC and compliance.

    • Digital wallet
    • KYC
    • Gateways
    • E-invoicing

  5. Load Testing & Web Performance

    Load testing with k6, unit testing with Jest, bottleneck analysis and PostgreSQL, MySQL and Redis tuning.

    • k6
    • Jest
    • PostgreSQL
    • Redis

  6. Software Development Outsourcing

    Senior full stack Node.js and React engineer embedded in your existing team, with NestJS backend consulting.

    • Node.js
    • React
    • NestJS
    • TypeScript
B

For small and mid-sized businesses

Online presence, management and automation

  1. Professional Business Websites

    Fast, responsive, SEO-ready company websites — custom-built, no generic templates and no platform fees. Freelance or through Belko Dev, with a contract and invoice.

    • Next.js
    • React
    • SEO

  2. Online Store & E-commerce

    Online stores with catalog, cart, checkout and payment integration, including split payments.

    • React
    • Node.js
    • Payments

  3. High-Converting Landing Pages

    Single pages built to convert Google Ads and social media campaigns, with fast loading and result tracking.

    • Performance
    • Analytics
    • Ads

  4. Online Booking System

    Online scheduling for clinics, barbershops, salons and studios: time slots, automatic confirmation, reminders and built-in payment.

    • React
    • Node.js
    • PostgreSQL

  5. iOS & Android Mobile Apps

    React Native apps: one codebase for both stores, with push notifications and REST API integration.

    • React Native
    • TypeScript
    • Firebase

  6. Process Automation & Custom Systems

    Custom systems for small companies and process automation for local businesses: spreadsheets, WhatsApp and manual typing become an automatic workflow.

    • Automation
    • Integrations
    • AI
02

TECH STACK

What we build with

01Frontend
ReactReact NativeAngularTypeScriptNext.jsHTML5 / CSS3Figma
02Backend
Node.jsNestJSAdonisJSExpressPHPPythongRPCREST APIs
03Infra & DevOps
AWSDockerRabbitMQMicroservicesk6 Load TestsJestGitLinux
04Databases
PostgreSQLMongoDBMySQLFirebaseOracleRedis
05Special Integrations
Payment gatewaysSplit paymentsKYC / ComplianceBrazilian e-invoicing (NFe)Withdrawal & deposit APIsCasino providersERPs
03

WHO IS BEHIND IT

You talk directly to the person writing the code

Wenderson Belko

Senior Full Stack Engineer · São Paulo, Brazil

6+ years building systems across 6 companies, focused on critical financial systems and complex integrations. There is no middle layer here: the person you talk to is the person who builds.

Get to know me GitHub
Years of experience
6+
Companies
6
In the industry since
2020
Technologies
25+
04

START A PROJECT

Quick brief — about 2 minutes

01 / 06 Project type
What do you need to build?

You can pick more than one.

Where is the project right now?

Pick one — it moves on automatically.

How urgent is it?
Do you have a budget range in mind?

It only helps size the proposal. Skip it if you prefer.

Briefly describe what you need

The more concrete, the more accurate the proposal.

▍ ANSWER IF YOU CAN

  1. What problem needs solving today?
  2. Who will use it and how many people?
  3. What exists today — spreadsheet, system, paper, nothing?
  4. Does it need to integrate with anything? ERP, payments, WhatsApp…
  5. What would success look like in 6 months?
0 characters

Where should I reply?

I reply within 1 business day.

I only use your details to reply to this message. I never share them.

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05

PREFER TO TALK DIRECTLY?

WhatsApp gets the fastest reply

DIRECT CHANNEL

TALK TO ME

Wenderson Belko · Senior Full Stack Engineer · Belko Dev

For recruiters, tech leads and companies: full stack opportunities, custom projects from MVP to enterprise, or just an honest conversation about the problem that is holding you back. I am the one who replies.

Software development company based in São Paulo, Brazil — on-site in the region and remote across Brazil.

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BELKO DESENVOLVIMENTO DE SOFTWARES LTDA · CNPJ 55.801.271/0001-38