Hendry Zheng
Backend, Platform & Applied AI Engineer — Remote Worldwide
I build and improve backend systems, APIs, integrations and applied AI solutions. From production-grade platforms to AI agents and internal automation, I work closely with teams to understand the real problem, build the solution and get it running reliably in production.
Independent software engineering and technology services operated through
PT SUKSES CAHAYA DIGITAL, Indonesia.
Core Expertise
- • Backend architecture, distributed systems & platform engineering
- • API Gateway design & migration (KrakenD, Tyk, Kong)
- • API modernization & OpenAPI standardization
- • Node.js / TypeScript / PHP backend optimization
- • Distributed system reliability & chaos testing
- • Mobile App Development (React Native / Ionic)
- • Web App Development (Next.js / Laravel / Vue)
- • Secure API design (JWT, signed payloads, rate limiting)
- • AI agents & agentic workflows (tool calling, MCP integrations)
- • LLM-powered internal tools & AI-assisted operational workflows
- • Retrieval / knowledge systems & document intelligence
- • Structured extraction, guardrails, evaluation & observability
- • Process automation & workflow orchestration
- • Financial systems & loan processing workflows
- • Third-party API integration & data synchronization
- • Web3 & DeFi protocol integration (ethers.js, smart contract automation)
- • ETL pipelines & data transformation
- • Business process digitization & legacy system modernization
- • Event-driven architecture & message queuing (RabbitMQ, Kafka)
- • Disaster Recovery (Tyk, PostgreSQL, Redis)
Service Offerings
Applied AI Solutions
Build AI into real business workflows rather than standalone demos. I design and implement agents, LLM-powered tools and automation that integrate with existing APIs, databases and operational systems.
Multi-step agents with tool calling and MCP integrations, wired into the services, APIs and internal tools already in use.
Retrieval over internal documents and data, with grounding, permissions and traceable sources.
Structured extraction and document processing pipelines with validation and human-in-the-loop review.
Evals, guardrails, observability and failure handling, so behaviour stays measurable once it is in production.
Forward Deployed Engineering
For problems that are difficult to define upfront, I work directly with product, engineering and business teams to understand the workflow, identify the real constraint and build the solution alongside the team. This can involve backend systems, integrations, data workflows, AI agents, internal tooling or a combination of them.
The engagement is hands-on: understand the problem, prototype quickly, integrate with existing systems, productionize and iterate based on actual usage.
- • Ambiguous technical problems
- • New AI initiatives
- • Internal operational tooling
- • System integrations
- • Technical discovery followed by implementation
- • Projects where requirements emerge while building
Web3 / DeFi Focus
Hands-on DeFi engineering with ethers.js for lending, liquidation, and execution tooling. Designed for reliability-first operations with clear monitoring and alerting.
Wallet orchestration, multicall batching, and transaction hygiene (gas controls, retries, health checks).
EVM-compatible lending, staking, liquidation, and portfolio monitoring pipelines with alerting hooks.
Ethers.js-driven watcher for on-chain positions with liquidation visibility and alerting hooks.
Fullstack Node/TypeScript Builds
End-to-end Node/Express and React/TypeScript apps for auctions, workflow ops, fares, and service health.
- Auction System (Node/Express + React TS) — Real-time bidding flow with TypeScript, API orchestration, and reactive UI.
- Task Application (Node + React) — Task orchestration app with Node backend and React frontend.
- Trip Fare Application — Fare calculation workflow with backend services and client UI.
- simple-nodejs-httpstat — Lightweight HTTP latency/status probe for service health checks.
Highlighted Engagements
- Venus Liquidator Monitoring — DeFi liquidation watcher built with ethers.js, alerting, and on-chain risk visibility.
- Fintech Gateway Migration — Migrated from custom Express gateway to KrakenD; improved scalability and observability.
- Network Operations API (CSET) — Modernized legacy APIs for gateway onboarding and network analytics.
- Customer Self-Service Platform (BSS) — Unified multiple customer APIs under a single API gateway for better user experience.
- Disaster Recovery (Tyk Ecosystem) — Architected DR for gateway, dashboard, pump, and portal.
- Gateway Proxy Release Testing — Designed percentage-based traffic rollout strategies and test plans.
- Velintech Client Apps — Delivered end-to-end mobile & web app solutions for SMEs and enterprises.
Example Problems I Can Help With
- • Build an AI agent that works across existing internal tools and APIs
- • Add LLM capabilities to an existing SaaS or product
- • Automate operational workflows with AI plus deterministic business logic
- • Build reliable document extraction and processing pipelines
- • Connect fragmented internal systems
- • Design and build new backend services
- • Improve API and platform reliability and performance
- • Take an AI prototype into production
- • Evaluate where agents make sense versus conventional software
- • Act as an embedded engineer on a new technical initiative
How I Work
Engagement Model
Project-based delivery, long-term engineering engagements and FDE-style technical partnerships. Remote collaboration worldwide.
Engagements can start from
- • A defined engineering project
- • An AI use case
- • An operational problem
- • An architecture or problem discovery phase
- • An ambiguous problem needing hands-on technical exploration
Commercial engagements and invoicing are handled through PT SUKSES CAHAYA DIGITAL.
Contact
Prefer email for initial contact. I respond to concise project descriptions (scope, timeline, and preferred collaboration model).
Commercial engagements, contracts and invoicing are handled through PT SUKSES CAHAYA DIGITAL.