Education platform
Pilih Jurusan
A psychology test and student guidance platform that helps students understand their interests, strengths, major options, and career direction.
EducationAssessmentStudent guidance
Backend and platform engineer
Abdul Arfan: Builds reliable systems for finance, education, and operational platforms.
A 10+ year engineer and technical leader experienced in backend systems, APIs, cloud services, internal platforms, monitoring, cost optimization, and engineering mentorship.
Current roleManager IT Development
LocationIndonesia
Availability1 month notice
AI Engineer
Builds applied AI features — RAG pipelines, LLM orchestration, embeddings, and brand-visibility tooling grounded in real data.
Backend Engineer
Designs reliable APIs, money-movement and underwriting services, and operational platforms that stay understandable after launch.
SaaS Builder
Ships end-to-end products — from auth and data models to deployment — including multi-tenant and cost-conscious builds.
AI Consultant
Advises product teams on where AI fits, how to keep it honest, and how to integrate LLMs without overbuilding infrastructure.
Profile
Engineering judgment shaped by production systems.
I work across backend architecture, cloud infrastructure, product delivery, and operational reliability. My background spans digital banking, fintech underwriting, vulnerability scanning, smartcards, telecommunications, school platforms, and research environments.
I like teams that care about clear APIs, resilient services, practical documentation, good monitoring, and the engineering habits that keep systems understandable after launch.
Built projects
Sites and tools in the wild.
Public examples across education, company sites, document utilities, and everyday tools. Each one now has a project detail page inside this portfolio.
Details
Education website
Homeschooling Kak Seto
A public website for Homeschooling Kak Seto, presenting accredited SD, SMP, and SMA learning programs, branches, registration paths, and school information.
EducationSchool websiteRegistration
Education platform
Jurnal Sahabat Anak
A student journaling platform for Homeschooling Kak Seto, supporting structured activity records and student progress updates.
EducationStudent journalInternal platform
Company website
Intidaya Dielectric
A business website for Intidaya Dielectric, built to present the company, its services, and customer-facing information clearly.
Company profileWeb presenceDelivery
Browser utility suite
PDF Tools
A practical web toolbox for working with PDF files, focused on fast document workflows and simple in-browser interactions.
PDFDocument toolsUtility app
Collaboration and file-sharing tool
Entangle
A real-time collaboration tool for creating shared rooms, editing text together, and sharing files through invite-based sessions.
SvelteKitTypeScriptSupabaseRealtimeFile sharing
Image utility
BG Remove Extrapolator
A browser tool for transferring low-resolution transparency masks onto high-resolution images.
Image processingBackground removalUtility app
Prayer schedule app
Jadwal Sholat
A lightweight prayer time application for checking daily schedules with a clean, direct user experience.
Public utilityScheduleCloudflare Pages
Android apps
Play Store products under KMB Technologies.
Consumer Android apps published on Google Play, with Klakson Telolet as the main standout after reaching a reported 2.5M lifetime downloads.
Featured Android app
Klakson Telolet
A bus horn soundboard app for Android, built around the Indonesian telolet phenomenon.
2.5M lifetime downloads reported
1M+ downloads shown on Google Play
4.3 rating and roughly 24K reviews on the Play listing
Supports dozens of default telolet sounds.
Includes mod slots and downloadable additional sounds.
Maintained under KMB Technologies on Google Play.
Contact management Android app
Virtual Contact
A private contact manager for storing, organizing, importing, exporting, and managing phone numbers separately from the phone's default contact list.
Sound Android app
Sirine Arogan
A playful sound app for playing sirine and horn-style sounds from an Android device.
Sound Android app
Suara Remote Kunci Mobil
A small Android app that recreates car key remote lock and unlock sounds.
AI projects
Hands-on with retrieval, embeddings, and LLMs.
Small, focused builds that explore how to ground language models in real data — kept deliberately dependency-light and easy to reason about end to end.
Retrieval-augmented generation · Python CLI
RAG Embedding Toolchain
A minimal, hand-built RAG toolchain: chunk text files, embed them with sentence-transformers, store the vectors in SQLite through the sqlite-vec extension, retrieve with cosine similarity, and answer questions through the OpenAI API. Shipped as three small CLI tools with multi-tenant client isolation by design.
- sqlite-vec as the vector store — no Pinecone, Chroma, or FAISS dependency
- Multi-tenant data isolation by client, with knowledge bases updatable by knowledge_id
- Hand-rolled chunking, embedding, and retrieval plumbing (no LangChain)
- all-MiniLM-L6-v2 embeddings (384-dim) feeding OpenAI chat completion
PythonRAGsqlite-vecOpenAIsentence-transformersVector search
GEO scoring · Next.js + Supabase SaaS
Brand Visibility Analyzer
A SaaS-style tool that measures a brand's visibility inside AI answer engines — ChatGPT, Gemini, Claude, Perplexity, and Llama. It auto-generates category search queries with an LLM, fires them at a user-selected model through OpenRouter, and scores the brand by how often it and its competitors are mentioned (and cited) in the answers. Results are stored per user with per-model breakdowns and re-analysis history.
- Live multi-model orchestration through OpenRouter — no static mock data
- LLM-generated search queries adapt to each brand's category
- Per-model visibility breakdown with brand mentions, ranking position, and website-citation counts
- Supabase auth with admin-gated analysis and row-level-secured result history
Next.js 16TypeScriptSupabaseOpenRouterGEOLLM orchestration
Work timeline
Chronological career path.
A detailed horizontal timeline from early smartcard and research work through banking, platform engineering, and education systems.
Swipe for older roles
Nov 2025 - Present
Manager IT Development
PT Kazeto Putra Perkasa / Sekolah Kak Seto
Indonesia
Lead end-to-end IT operations and software development for school systems, infrastructure, networking, and internal platforms.
- Built Jurnal Sahabat Anak, a student activity journaling application for tutors and parents.
- Enabled tutors to record student activities and progress in a structured digital workflow.
- Enabled parents to view student updates and comment on activity logs.
- Manage infrastructure, networking, wireless systems, Google Workspace/Classroom, and internal platforms.
- Mentor IT Support, IT Developers, and Software Engineer roles.
EducationIT operationsInternal platformsMentorship
Apr 2025 - Nov 2025
Research and Business Development
PT Kazeto Putra Perkasa / Sekolah Kak Seto
Indonesia
Researched school operational processes and supported digital transformation and business-development initiatives.
- Conducted research to improve school operational processes.
- Developed product and business-development initiatives to support growth and expansion.
- Supported digital transformation and new internal system initiatives.
ResearchEducationOperationsDigital transformation
Dec 2024 - Mar 2025
Principal Engineer
Broom.id
Indonesia
Led platform reliability, AWS cost optimization, promo engine work, scheduler systems, and engineering documentation.
- Reduced RabbitMQ-related infrastructure cost.
- Initiated AWS Compute Optimizer usage for rightsizing and idle resource elimination.
- Combined low-load services into one VM to reduce operational cost.
- Designed and implemented promo engine and recurring scheduler systems.
- Mentored engineers on data consistency, optimistic locking, CQRS, and Saga discussions.
- Developed a documentation framework for backend, frontend, and QA collaboration.
AWSNext.jsTypeScriptDatadogCost optimization
Mar 2022 - Dec 2024
Software Engineer
Aladin Bank
Indonesia
Designed and implemented backend systems for digital banking, including money movement, recurring services, and e-statements.
- Built money movement APIs, recurring services, and e-statement generators.
- Monitored production systems with Datadog and Opsgenie.
- Resolved operational issues and created RCA documents for incidents.
- Improved API design and backend efficiency across critical services.
GolangMySQLGCPDatadogOpsgenieBanking
Apr 2020 - Mar 2022
Software Engineer
SRLabs / Autobahn
Remote / International
Developed backend services for vulnerability scanner products and security-platform integrations.
- Built backend services for vulnerability scanner products.
- Integrated the platform with Jira and Splunk.
- Worked with AWS-based backend infrastructure.
PythonMySQLAWSSecurityJiraSplunk
Oct 2019 - Apr 2020
Software Engineer
OVO / PT Visionet Internasional
Indonesia
Developed backend systems for underwriting workflows and loan eligibility assessment.
- Built backend services for underwriting workflows.
- Integrated APIs used to assess loan eligibility.
- Supported decision-making workflows through backend services.
PythonGolangMongoDBUnderwritingFintech
Oct 2017 - Oct 2019
Fullstack Engineer
Mapan
Indonesia
Developed backend services and business logic for sales operations and supply-chain processes.
- Built backend services for sales operations.
- Implemented supply-chain business logic.
- Worked with Python/Django, Golang, and GCP-based systems.
PythonDjangoGolangGCPSupply chain
May 2014 - Oct 2017
Senior Software Engineer
Bumblebee Technologies
Indonesia
Worked on smartcard and telecommunications projects, including SIM card testing tools and operating-system components.
- Developed testing applications for SIM card projects.
- Created custom file-system components for SIM cards.
- Built operating-system components for smartcards.
- Worked with telecommunication operator clients and smartcard constraints.
JavaCSmartcardSIM cardTelecommunications
Nov 2013 - May 2014
Senior Developer
BilineDev
Indonesia
Developed backend systems for mobile applications and contributed to backend and mobile components.
- Built backend features for mobile application projects.
- Worked across PHP, Java, and Objective-C codebases.
- Supported application delivery for consumer mobile use cases.
PHPJavaObjective-CMobile backend
Mar 2013 - Nov 2013
Software Engineer
Cipta Srigati Lestari / CSL Group
Indonesia
Worked on fingerprint library research and Java Card file-system implementation for biometric smartcard systems.
- Researched fingerprint ISO standards and compact representation of minutiae data.
- Implemented conversion from minutiae data to compact card format.
- Developed file-system components in Java Card.
Java.NETJava CardBiometricsFingerprint
Mar 2012 - Feb 2013
Researcher
Ajou University
South Korea
Researched hard disk mechanisms and caching models, with published work based on the research outcomes.
- Studied SATA hard disk behavior and access-time-aware cache models.
- Built research understanding around storage mechanisms, performance, and cache behavior.
- Prepared research outputs that led to an accepted paper at IEICE Journal.
JavaCResearchStorageCaching
Sep 2008 - Mar 2010
Software Developer
Universitas Indonesia
Indonesia
Built smartcard biometric data capture systems, SMS gateway infrastructure, web services, and Java desktop tooling.
- Developed Java application features for picture capture and editing.
- Built fingerprint data capture functionality for smartcard-related workflows.
- Implemented SMS gateway infrastructure and supporting web services.
- Worked with PHP, Java, MySQL, and PostgreSQL across application and data layers.
PHPJavaMySQLPostgreSQLSmartcardSMS gateway
Writing
Technical notes from real builds.
Short-form technical writing about protocols, implementation tradeoffs, and systems that need to feel practical in use.
Jun 7, 2026 / Realtime collaboration
Entangle
A build note about Entangle, a small web tool for invite-based text collaboration and file sharing.
Room-Based CollaborationRealtime Text EditingFile Sharing
Apr 4, 2026 / Embedded systems
VirtualKeyMouse
A technical write-up about turning an Android phone into a wireless keyboard and mouse through Bluetooth, ESP32-S3, and USB HID.
Runtime BehaviorCommand ProcessingHID Mapping
Recognition
Achievements, talks, and publications.
Achievements
2nd Place, 2024 AngelHack HackJakarta, Financial Inclusion TrackView details
Finalist, Mandiri "What the Hack" Hackathon Competition, National Top 50 Developer
Finalist, Republic of IoT 2018 Makers Make Nation, National Top 30
3rd Place, 2017 BCA Financial Hackathon
Gold Medal / 1st Place in Applied Programming, National Science Week 2007
Silver Medal / 2nd Place in ICT Open Source Creation Event, National Science Week 2008View detailsTalks and Publications
FAQ
Working with an AI engineer and backend engineer.
What does an AI engineer do on a product team?
As an AI engineer, I build applied AI features that stay grounded in real data — retrieval-augmented generation (RAG) pipelines, LLM orchestration, embeddings, and tools that measure visibility inside AI answer engines. The goal is practical AI that ships, not demos.
Are you available as an AI consultant?
Yes. As an AI consultant I help teams decide where AI genuinely fits, how to keep model output honest and evaluable, and how to integrate LLMs without overbuilding infrastructure. Saya tersedia sebagai konsultan AI maupun programmer AI untuk tim produk di Indonesia.
What kind of backend engineer are you?
I am a backend engineer with 10+ years across digital banking, fintech underwriting, vulnerability scanning, and education platforms. I work on money-movement APIs, recurring services, internal platforms, monitoring, and the engineering habits that keep systems understandable after launch.
Do you work as a SaaS builder?
Yes. As a SaaS builder I ship end-to-end products — authentication, data models, multi-tenant isolation, deployment, and cost-conscious infrastructure. Several public tools and internal platforms in this portfolio were built that way.
Where are you based, and what is your availability?
I am based in Indonesia and has experience in working remotely with international teams. Current availability is with a one-month notice period. Reach out via the contact button above for AI engineering, backend, or SaaS builder work.