Full-stack Developer (Middle-Senior)

• Backend APIs and background workers in .NET (8, 10), using MongoDB and MySQL, Redis for caching, Hangfire for scheduled/background jobs, and MediatR for CQRS-style request handling
• Feature UI in Nuxt 3 / Vue 3 (Composition API, Pinia) for our member-facing and partner-facing portals
• Occasional work in our React 18 + TypeScript LMS module (Redux Toolkit, React Router, Vite)
• Cross-service integrations — e.g., file uploads via our storage microservice, employee data sync with external HR systems
• Using AI coding tools (e.g., Claude Code, Copilot, Cursor) as part of your daily workflow to scaffold, refactor, and ship features faster across our multi-service codebase
• Collaborating with product and design to turn compliance/legal requirements into clear, usable product features

• 3+ years of professional full-stack experience, comfortable owning a feature from database to browser
• Strong proficiency in C#/.NET (or a similar strongly-typed backend language) and modern JavaScript/TypeScript
• Experience with Vue or React (we use both across the product) and state management patterns (Pinia/Vuex/Redux)
• Working knowledge of MongoDB or another NoSQL/document database; comfortable with relational databases too
• Familiarity with REST API design, authentication (OAuth2/OIDC), and background job processing
• Hands-on experience with AI-assisted development tools, and good judgment about when to lean on them and when to review their output critically
• Ability to work independently across a multi-service codebase and communicate tradeoffs clearly
• Bonus: experience with AWS (Lambda, SQS), Redis, or building in a regulated/compliance-heavy domain

Nice to Have

• Experience with SCORM/LMS content or e-learning platforms
• Exposure to multi-tenant SaaS architecture (white-labeling, subdomain-based tenancy)
• Familiarity with Hangfire, MediatR, or other CQRS/mediator patterns in .NET
• Experience integrating AI/LLM features into a product (e.g., API-based completions, RAG, agentic workflows)

• Working time: 9AM - 6PM, Monday to Friday
• Participate in a young and dynamic team with flexible working environment.
• 13th-month salary and performance review 2 times/year
• Premium Healthcare Package from Bao Viet
• Free Coffee & Tea, snack everyday, happy hour every Friday afternoon
• Sport activities (Football & Badminton are fully sponsored)
• Annual company trip, year-end party, company events, teambuilding,...
• Benefits according to the Vietnam Labor Laws
• Gifts for Birthday, Wedding, Mid-Autumn Festival,...

Launched in 2016, BigIn is a leading software development company with extensive experience in building custom enterprise systems, mobile applications and stunning websites. We have been helping global businesses and startups in adopting cutting-edge technology into their business strategies and developing profitable digital products. 

Through our exciting journey, BigIn is honored to have been accompanied by more than 30 successful global initiatives, from Vietnam to the United States, Europe, and beyond, with many more on the way.