Hoang Yell
Senior Software Developer
Professional Summary
Senior Software Developer with 8+ years of experience in Python backend and API development. Builds cloud-native, microservices-based systems with a focus on performance optimization, observability, and structured logging. Skilled in asynchronous processing and integrating enterprise solutions (e.g., ATS like SAP SuccessFactors). Startup-minded team player passionate about solving complex problems and delivering scalable solutions.
Core Skills
- Languages & Tools
- Python · JavaScript · SQL · Git · Linux
- Frameworks
- Django · FastAPI · Flask · Node.js
- APIs & Protocols
- REST · WebSocket · OpenAPI
- Cloud & Platforms
- AWS · Firebase · Cloudflare · Serverless
- Data & Observability
- Athena · S3 · Datadog · Sentry · Logging
- DevOps & Tools
- CI/CD · Docker · Kubernetes
Professional Experience
Paradox.ai — Senior Software Engineer
- Developed an internal Postman-like automation tool for large-scale asynchronous API requests, cutting per-client dev time and shifting workflows from developers to integration specialists (Compass Group, 7-Eleven, McDonald's, etc.).
- Led migration from centralized RDS logs to region-aware data lakes via Kinesis → Firehose → S3 and Athena queries — improving performance, compliance, and scalability.
- Created "Yell Lang", a custom JSON-based DSL allowing non-devs to configure 3rd-party API workflows directly from the UI.
- Proactive in finding and implementing new monitoring solutions utilizing Datadog and Sentry with Slack alerts, reducing production incidents significantly.
- Delivered enterprise integrations with SAP SuccessFactors, Salesforce, and other ATS systems for global clients.
Fiverr — Freelancer Developer
- Completed diverse freelance projects for global clients.
- Maintained 100% 5-star client satisfaction across multiple backend and automation projects.
- Delivered solutions in Python, Regex, Screaming Frog, and other tools.
FPT Software — Software Developer
- Built full-stack modules with ASP.Net, Angular, ReactJS, Node.js, and Swift / Xamarin.iOS for enterprise clients.
- Gained extensive enterprise development experience in structured corporate teams and agile workflows.
GOSU Online Corporation — Part-time Developer
- Designed REST APIs and optimized database schemas for a scalable online card-game platform.
- Built WebSocket-based real-time gameplay in Python/Node.js, increasing player engagement by 80%.
- Launched an in-game event driving over 130M VND (~$5,500) in revenue within two weeks.
Personal Projects
- hoangyell.com — personal blog, updated when inspired.
- spychat — real-time chat app on Cloudflare Edge (Workers, Durable Objects, TypeScript) + Next.js.
- jobs.hoangyell.com — automated job search and vacancy parsing platform with FastAPI + Next.js, enhanced with LLM-based analysis.
Education
Hue University of Sciences, Hue, Vietnam
- GPA: 3.22 / 4.00 — Ranked 1st in cohort
Certifications
- AWS Certified Developer – Associate (2017–2019)
Strengths
- Ownership & Accountability — delivers reliable, on-time results.
- Deep backend expertise — Python, API design, async, distributed systems, observability.
- Cloud-native mindset — AWS & Cloudflare edge deployments at scale.
- Team collaboration — effective communicator across global time zones.