Felix Winston · Full-Stack AI Engineer
Building Intelligent Software, From AI Agents to Production Applications.
I'm a Full-Stack AI Engineer specializing in AI agents, machine learning systems, backend development, web applications, and mobile development.
Medan, Indonesia · Remote-ready
Languages: Indonesian (native), English (professional working)
Public track record on Fastwork
fastwork.id/user/felixwlimz — opens in a new tab- 5.0
- Rating
- 14
- Completed orders
- 7
- Reviews
- 3
- Rehired
Figures taken from the public Fastwork profile on 8 November 2026 and may change.
Expertise
Technical expertise
- AI Engineering
- AI AgentsLangGraphLangChainRAGLLM applicationsPredictive modelingPyTorchscikit-learn
- Backend
- PythonFastAPIPostgreSQLREST APIs
- Frontend
- Next.jsReact
- Mobile
- FlutterDartRiverpodBLoC
- Engineering
- Clean ArchitectureAPI integrationTestingDeployment
Experience
Professional experience
January 2026 — Present
Futurescale Digital Technology
AI Engineer (Freelance)
- Develop stateful AI agents with LangGraph and LangChain workflows
- Build tool integrations and FastAPI endpoints
- Design machine learning pipelines from data to inference
- Ship AI-powered product features
December 2024 — Present
PT Bank Mestika Dharma Tbk.
Mobile Developer
- Develop production Flutter applications for banking operational systems
- Apply Clean Architecture with Riverpod and BLoC
- API integrations and integration testing
September 2023 — July 2024
Musim Mas Group
Officer — Operations Management
- Monitored factory operations
- Identified operational bottlenecks and supported process improvements
Selected Work
Selected projects
Each project carries an attribution label. Professional work is not a FEWN Digital client project, and vice versa.
Professional work at Futurescale Digital Technology
JourneyX
AI Platform
JourneyX turns fragmented trip planning into a single guided flow. A conversational AI assembles day-by-day itineraries around traveller intent, budget, and dietary needs, then hands the plan to verified local operators.
Developed at Futurescale Digital Technology, where Felix Winston works as an AI Engineer. Shown as professional experience, not as a FEWN Digital client project.
- Next.js
- TypeScript
- Python
- PostgreSQL
View case studyjourneyx.futurescaletech.comProfessional work at Futurescale Digital Technology
Foresight AI
Business Intelligence
Foresight AI reads operational and marketing data to forecast demand, revenue, and churn risk. Teams get a shared analytics surface with plain-language explanations behind every projection.
Developed at Futurescale Digital Technology, where Felix Winston works as an AI Engineer. Shown as professional experience, not as a FEWN Digital client project.
- Next.js
- FastAPI
- Python
- PostgreSQL
View case studypredictive.futurescaletech.comFEWN Digital client project
Beesmarts
Traceability Platform
Beesmarts pairs every batch of Siak acacia forest honey with a digital record: hive coordinates, colony sensor readings, extraction date, and lab results, so a buyer can trace a bottle back to the hive it came from. The brand storefront and verification lookup run on one system.
Designed and built by FEWN Digital for this client.
- Next.js
- TypeScript
- PostgreSQL
- Cloud
View case studybeesmarts.co.idIndependent project
Scrib
Fintech Platform
Scrib gives finance teams a live picture of assets, liabilities, and cash position, with structured records, approvals, and audit-ready exports.
An independent project developed without an external client.
- Next.js
- TypeScript
- Python
- PostgreSQL
Freelance Services
What I can do for you directly
- 01
Full-Stack Web Development
Websites and web apps with Next.js, React, and a Python/FastAPI backend.
- 02
AI Agent Development
Stateful agents with LangGraph/LangChain, tool calling, and RAG for specific needs.
- 03
API & Backend Development
REST APIs, PostgreSQL databases, authentication, and FastAPI services.
- 04
Mobile App Development
Android and iOS apps with Flutter and clean architecture.
- 05
AI Integration & Automation
Connecting AI models and automated workflows to the systems you already use.
Education
Education
Universitas Mikroskil
2020 — 2024Bachelor of Computer Science
Programs & Achievements
Programs & achievements
Laskar AI — AI Engineer Cohort
2025NVIDIA-backed national AI scholarship. One of 100 selected professionals and lecturers.
Bangkit Academy — Mobile Development Cohort
2023One of 5,000 participants selected from roughly 67,000 applicants.
ICStar Hackathon
2023ONE INDONESIA. One of 117 participants from roughly 3,000 applicants.
Contact
Let's work together.
For freelance projects or opportunities, reach me through the channels below.
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