Architecting resilient backend systems & scalable AI platforms.
Hello, I am Kevin Putrayudha Naserwan. An engineer specialized in high-concurrency microservices, distributed data pipelines, and mission-critical enterprise platforms across mining, ERP, and smart transport ecosystems.
Verified Scale, Polyglot Breadth & Production Uptime
Key engineering milestones and code metrics across enterprise mission-critical systems and open-source ecosystems.
Polyglot open source systems across Go, C#, TypeScript, Rust & Python.
Mission-critical ERP & supply chain at PT Bukit Asam Tbk & HashMicro.
Core Web Vitals optimized, slashed slow URLs from 3,956 down to 246.
Community stars across high-performance utilities, developer tools & open-source packages.
Selected among Top 100 national innovators for rural cooperative digital empowerment.
Zero discrepancy transaction pipelines, atomic database guards & SAP reconciliation.
Frequently Used Languages & Architectural Arsenal
A battle-tested polyglot toolset spanning distributed microservices, low-latency stream parsers, resilient queues, and sub-second web frontends.
TypeScript
Core language for enterprise microservices with NestJS at PT Bukit Asam Tbk, sub-second SSR island architecture with Astro at HashMicro, and modern reactive frontends in Next.js 14. Also powers compiler analyzers like query-lens and mock servers like ts-mocktail.
Go (Golang)
Leveraged for low-latency streaming tools and CLI utilities such as db-masker (streaming SQL lexer), event-driven WhatsApp & CRM webhook microservices, high-throughput workers, and concurrent goroutine pipelines with sub-millisecond execution.
C# / .NET 8
Applied in building mission-critical background job orchestrators like resil-mesh (sliding-window rate limiting & dead-letter queue) and ultra low-latency sports telemetry engines with Clean Architecture, CQRS (MediatR), and Redis time-series streams.
PHP / Laravel
Engineered mission-critical judicial public portals including the Pengadilan Agama Muara Enim Digital Guest Book with webcam hardware intake, institutional administrative platforms, robust relational MySQL schema architectures, and multi-tenant MVC services.
Python
Engineered computer vision pipelines combining YOLOv8 and ByteTrack for ball tracking & possession analytics, PyTorch temporal convolutions for satellite crop yield forecasting via Sentinel-2, and spatiotemporal wildfire early warning systems with LightGBM.
Rust & WebAssembly
Authored zero-server privacy utilities like doc-scrub compiled directly to WebAssembly, providing instantaneous offline text and document redaction in the browser with deterministic regex matching and zero memory leaks.
Built with clean precision, verified by production scale.
From modernizing mission-critical ERP microservices at state-owned mining enterprise PT Bukit Asam Tbk to migrating 4,100+ web applications at HashMicro, I focus on clean architecture, sub-second latency, and deterministic reliability.
Top 100 Hackathon Koperasi Desa Merah Putih
Selected among the Top 100 national innovators in building technology solutions for rural village cooperatives and digital economic empowerment across Indonesia.
Core Web Vitals Optimization (4,100+ Pages)
Slashed poor-performing URLs from 3,956 down to 246 via Astro SSR, asset caching with Redis, and island architecture at HashMicro.
State-Owned Enterprise Systems
Engineered enterprise backend integrations with SAP ERP, real-time logistics tracking, and automated transactional pipelines for PT Bukit Asam (Persero) Tbk.
Production Systems & Real Client Solutions
Real platforms engineered for public transportation, government analytics, Islamic education institutes, and municipal digital services.
LRT Sumatera Selatan Official Portal
Comprehensive web platform providing passengers with instant transit schedules, interactive route maps, tariff calculators, and multi-station connectivity data.
Parking Monitoring & Revenue Analytics
Real-time administrative analytics dashboard for municipal authorities, tracking 2,300+ daily vehicle movements, revenue charts, and zone saturation.
Digital Guest Book System & Verification
Judicial institution visitor intake platform with hardware webcam integration, instantaneous identity logging, automated queue numbers, and visitor archives.
Ma'had Tahfidz Institutional Platform
Digital portal and academic admission workflow for Islamic boarding school, modernizing santri enrollment, curriculum showcases, and institutional outreach.
HashMicro Multi-Country Web & Blog Ecosystem
Engineered high-scale web architecture and blog ecosystem across multiple countries, optimizing Core Web Vitals across 4,100+ pages and slashing bundle sizes via Astro SSR & Redis caching.
PBX MKT Cloud VoIP & Call Management System
Internal mission-critical VoIP telephony and call routing portal for sales and marketing teams, providing low-latency call dispatching, agent state telemetry, and CRM data pipeline integration.
Official Disposition & Incoming Mail Tracking System
Enterprise judicial document flow engine managing official incoming letters, multi-tier judicial leadership dispositions, digital approvals, and archive tracking.
Smart Parkir Baturaja Telemetry & Admin Portal
Municipal smart parking management system providing QR code scanning, spot occupancy telemetry, real-time ticket transactions, and regional revenue monitoring.
Bujang Gadis Official Web & CMS Portal
Headless content management system and official digital showcase for the regional youth ambassador pageant, featuring contestant profiles, voting systems, and event schedules.
High-Performance Systems & Production Repositories
Battle-tested production repositories on GitHub spanning stream lexers, resilient queues, AST analyzers, WebAssembly engines, and computer vision pipelines.
db-masker
High-throughput streaming SQL lexer & CLI written in pure Go for enterprise database data obfuscation, PII masking, and deterministic salted hashing.
resil-mesh
Resilient in-memory background worker queue engine in pure C# (.NET 8) with exponential backoff retries, sliding-window rate limiting, and dead-letter queues.
query-lens
Zero-dependency SQL execution plan analyzer and performance anti-pattern linter written in TypeScript, detecting full table scans, Cartesian products, and missing indexes.
ts-mocktail
Contract-driven type-safe mock API server generating deterministic, seedable fixtures directly from TypeScript interfaces and OpenAPI 3.0 schemas.
doc-scrub
Zero-server, privacy-first client-side document sanitizer compiling Rust to WebAssembly for instant offline redaction of API keys, secrets, and PII.
sports-telemetry-engine
Ultra low-latency sports telemetry ingest & processing engine built with .NET 8, Clean Architecture, CQRS, MediatR, and Redis time-series buffering for sub-second event broadcasts.
football-possession-tracker
Computer vision pipeline utilizing YOLOv8 and ByteTrack to track ball trajectories, compute real-time team possession percentages, and generate spatial pitch heatmaps.
id-crop-yield-sentinel
Deep learning framework for predicting agricultural crop yield in Indonesia combining Sentinel-2 multispectral imagery, Google Earth Engine, and PyTorch temporal convolutions.
nusantara-wildfire-earlywarning
Spatial-temporal wildfire prediction engine analyzing MODIS/VIIRS thermal hotspots, weather telemetry, and peatland hydrology via LightGBM and GeoPandas for Indonesian archipelago.
Work Experience & Production Impact
Proven history of scaling platforms, streamlining microservices, and delivering mission-critical applications.
Application Developer
- Engineering microservices architectures utilizing NestJS, Node.js, and SQL Server for enterprise mining operations and supply chain logistics.
- Maintaining mission-critical backend modules integrating SAP ERP, equipment health tracking (EHA), and multi-service operational APIs across 34 microservices.
- Hardening API data validation, query performance with TypeORM and raw T-SQL, and enforcing atomic transactional guards.
Fullstack Developer
- Architected frontend migration from legacy PHP to Astro & TypeScript using SSR and Island Architecture, dramatically improving SEO and slashing bundle size.
- Optimized Core Web Vitals across 4,100+ pages, cutting poor-performing URLs from 3,956 down to 246 with asset pipelines and Redis caching.
- Engineered high-scale backend services in NestJS and Golang for HR, CRM, distributed SEO crawlers, and PostgreSQL workloads.
- Built event-driven WhatsApp & CRM services in Go for low-latency webhook ingestion and centralized lead dispatching.
- Integrated AI automation workflows with Claude, OpenAI, and Gemini APIs for automated content analysis and SEO auditing.
Founder & Backend Developer
- Spearheaded product architecture, delivering responsive web platforms in Next.js and cross-platform mobile apps in Flutter.
- Constructed high-throughput backend services using Go, NestJS, and RabbitMQ message queues for event-driven asynchronous processing.
- Integrated Midtrans payment gateways, Google OAuth, and JWT authentication pipelines with zero transactional discrepancies.
Full Stack Engineer
- Built full-stack academic management modules using NestJS and Next.js for Universitas Padjadjaran (UNPAD) SIAKAD platform.
- Engineered conflict-free course scheduling algorithms, credit unit tracking (SKS), and grade recalculation pipelines.
Back End Developer Intern
- Built RESTful APIs following Clean Architecture principles within client enterprise web applications.
- Architected relational database schemas in MySQL, optimizing queries and foreign key indexing for high transactional integrity.
Technical Mastery & Stack
Tools, frameworks, and architectural paradigms leveraged to engineer resilient digital products.
Backend & Distributed
- NestJS & Node.js Advanced
- Golang Production
- PHP (Laravel) Proficient
- C# / .NET 8 Clean Arch
- Microservices Pattern
- RabbitMQ & Redis Messaging
Frontend Engineering
- Next.js & React Advanced
- TypeScript Strict
- Astro & SSR Islands
- Tailwind CSS Modern
- Flutter (Dart) Cross-Platform
- Canvas & Motion Dynamic
Databases & Storage
- PostgreSQL Advanced
- SQL Server (T-SQL) Enterprise
- MySQL Proficient
- Redis Cache In-Memory
- TypeORM / Prisma ORM
- S3 / MinIO Object
AI & DevOps
- OpenAI / Claude / Gemini APIs LLM
- PyTorch & YOLOv8 Vision
- Docker & Compose Containers
- Kubernetes Cluster
- Grafana & Telemetry Observability
- CI/CD & Git DevOps
Freelance Rates & Project Collaboration
Currently working full-time at PT Bukit Asam (Persero) Tbk. Available selectively for high-impact freelance projects, technical consulting, and deliverable-based milestone builds outside working hours.
Technical Advisory & Audit
Ideal for architectural reviews, backend bottlenecks, database indexing audits, and code optimization sessions.
- Microservice Architecture & Schema Audit
- Complex SQL / T-SQL Query Optimization
- API Contract & Security Verification
- Pair programming & 1-on-1 technical advisory
Full Project Delivery
End-to-end development of production web apps, management portals, telemetry dashboards, or microservice modules.
- Full-stack implementation (Next.js / NestJS / Go)
- Clean relational database schema & caching
- Interactive UI, Charts & Admin Dashboards
- Dockerized setup & Cloud / VPS Deployment
- 30-day post-launch warranty & handover
Part-Time Sprint Retainer
Dedicated part-time engineering bandwidth (~10–15 hours/week). Continuous feature rollouts, API maintenance, or AI pipelines.
- Dedicated weekly development sprints
- Ongoing API & database performance tuning
- Priority bug resolution & technical enhancements
- Direct communication via Slack / Discord / WA
Let’s build something extraordinary together.
Whether you need high-throughput microservices, enterprise ERP integrations, or modern AI application architecture, my inbox is always open.