Software engineer / B2B Commerce / Fintech / AI SaaS

Setya Pangga Raka Pangestu

Frontend-Focused Software Engineer

Frontend-focused software engineer with experience building fintech platforms, B2B systems, AI-powered applications, and secure SaaS products.

View ProjectsContact Me
Production SurfaceScalable SaaS UI

Typed components, secure access flows, API-driven screens, and reusable patterns.

Next.js
API
Auth
Storage
RAG
Audit
const product = buildSaaS({  frontend: "modular",  security: "aware",  systems: "scalable"})

Featured work

SaaS systems built with architecture in mind

Project showcases are framed around product constraints: retrieval quality, secure document delivery, maintainability, and reliable production workflows.

RAG-based Internal Knowledge SaaS

AI Team Knowledge Hub

A modular internal knowledge platform that turns team documents into grounded, citation-backed AI answers with vector search and production-grade retrieval flows.

Architecture Highlights

  • Retrieval-Augmented Generation with pgvector similarity search
  • Embedding pipelines for document ingestion and semantic recall
  • Grounded responses with citations and AI document processing
  • OpenAI SDK-compatible integration with TypeScript-first modules

Infrastructure

  • Containerized service boundaries
  • Typed ingestion workers
  • Citation-aware answer pipeline

Security Considerations

  • Source-scoped retrieval
  • Controlled internal access
  • Auditable AI response paths
Next.jsTypeScriptPostgreSQLpgvectorOpenAI SDKSumoPod AIDocker

Secure File Sharing Platform

Vaultiva

Secure document delivery infrastructure for password-protected links, signed access, download limits, watermarked previews, and audit-ready file workflows.

Architecture Highlights

  • Password-protected links with expiry controls and download limits
  • Signed URLs, secure preview flows, and Cloudflare R2 integration
  • Dynamic watermarking using Sharp and pdf-lib
  • Audit logging, CSP/XSS protection, and transactional email workflows

Infrastructure

  • Object storage architecture
  • Policy-driven access controls
  • Preview and delivery pipeline

Security Considerations

  • CSP/XSS hardening
  • Expiring signed URLs
  • Traceable access events
AngularNestJSPostgreSQLPrismaCloudflare R2

Engineering impact

Production habits that compound

The work emphasizes predictable systems, reusable abstractions, and engineering practices that keep product teams moving without sacrificing quality.

00DuplicationReduced

Reusable hooks and shared frontend primitives

00Re-rendersFixed

Stabilized state boundaries and memoized expensive flows

00VelocityImproved

Reusable patterns for forms, tables, data fetching, and UI states

00SecurityHardened

Secure frontend workflows, CSP awareness, and protected access patterns

Built scalable frontend patterns for forms, dashboards, data tables, and authenticated flows.

Improved maintainability through modular architecture and reusable component systems.

Implemented secure frontend systems for protected access, validation, and delivery workflows.

Applied production-ready SaaS practices across fintech, AI, and file-sharing products.

Technical stack

Frontend depth with fullstack range

Organized around the practical surfaces of modern SaaS products: interfaces, APIs, data, AI, infrastructure, testing, and secure delivery.

Frontend Development

ReactVue/NuxtAngularTypeScriptNext.jsTailwind CSSPiniaRedux

Backend & API Development

Node.jsNestJSREST APIsJWT AuthenticationTransactional Workflows

AI & RAG Systems

Vector SearchOpenAI SDK IntegrationEmbedding PipelinesRAGpgvector

Database & ORM

PostgreSQLPrismaSchema DesignQuery Modeling

Security Engineering

CSPXSS PreventionSigned URLsSecure File PreviewAudit Logging

Cloud & Infrastructure

DockerCloudflare R2Object StorageDeployment Workflows

Testing

JestComponent TestingRegression CoverageBehavioral QA

Architecture & Practices

Reusable ComponentsModular ArchitectureClean CodeScalable SaaS Patterns

Experience

Fintech, B2B platforms, and product engineering

A timeline of engineering work focused on shipping maintainable frontend systems inside real product constraints.

Software Engineer

Pohon Dana Indonesia

Fintech financing systems, production frontend workflows, and secure product delivery.

  • Built and maintained fintech-facing product interfaces for financing operations.
  • Improved frontend maintainability through reusable patterns and modular UI architecture.
  • Collaborated across product, backend, and QA to ship reliable production features.

Software Engineer

Elefin Indonesia

B2B platform development with scalable frontend systems and cross-functional delivery.

  • Developed B2B SaaS interfaces with attention to performance, clarity, and maintainability.
  • Reduced repeated implementation work through shared UI and state-management patterns.
  • Supported product iteration through clean integration with backend services.

Frontend-Focused Fullstack Engineer

Freelance Fullstack Engineer

AI-powered SaaS products, secure file-sharing systems, and end-to-end product builds.

  • Delivered AI-integrated applications with robust software engineering and backend APIs.
  • Designed secure document access workflows with previews, limits, and auditability.
  • Created reusable engineering systems for faster, cleaner SaaS development.

Security & architecture philosophy

Build interfaces like product infrastructure

The frontend should be a reliable system boundary: accessible, typed, secure, fast to extend, and clear enough for future engineers to trust.

Scalable software architecture

Feature modules, shared primitives, predictable state, and composition patterns that reduce incidental complexity.

Secure access systems

CSP/XSS prevention, signed access flows, guarded previews, and audit-friendly event modeling.

Maintainable product code

Clean component boundaries, reusable hooks, practical testing, and naming that mirrors product behavior.

AI-integrated SaaS

RAG pipelines, grounded responses, embedding workflows, and AI interfaces designed for user trust.

Contact

Let’s build secure, scalable SaaS products.

Available for frontend-focused fullstack engineering across fintech platforms, B2B SaaS, AI-powered applications, and secure product infrastructure.

setyarakap@gmail.comLinkedInGitHubWhatsApp