FullStack Developer for Tech Startup (Hybrid)

HydroNeo is a fast-growing, international startup focusing on Smart Farming solutions for the global aquaculture industry. Our vision is to expand our Smart Farm Management System — already the market leader in Thailand — into the HydroNeo Aquaculture Super App, serving everything farmers and the industry need. We are backed by leading Thai and international investors, BOI-promoted, with a dynamic team of 30+ working across our two offices in Bangkok and Surabaya.

​Are you ready to shape the future of aquaculture and make a real difference for shrimp and fish farmers worldwide? As our next FullStack Developer, you won’t just write code, you’ll help redefine an entire industry. This is not your typical 9-to-6 job. Here, your ideas matter, your voice is heard, and your code directly impacts real people and sustainable food production.

​We’re looking for a developer who’s hungry to grow, passionate about meaningful work, and excited to build something that truly matters. You’ll have the freedom to propose ideas, experiment, validate your solutions with data, and see your work come to life in the hands of our users.

​If you want to build, learn, and make a difference far beyond the average dev job, we want to meet you!

Primary Responsibilities:

Full-Stack Feature Development:

• Contribute to features across the stack, from database and APIs through to the Flutter mobile UI.
• Work with senior engineers, product, and design to turn requirements into working features.
• Grow into making independent implementation decisions as you learn our systems.

Mobile App Development (Flutter):

• Build and maintain screens, widgets, and state in our Flutter mobile application.
• Connect the app to backend APIs with proper error handling and loading states.
• Learn and apply mobile patterns for navigation, data flow, and platform behavior on iOS and Android.

API and Database Work:

• Build and extend REST APIs in Java that serve our Flutter clients.
• Write queries and schema updates across PostgreSQL and MongoDB, and learn when each fits best.
• Keep API contracts and documentation aligned with what the mobile app needs.

Working with AI:

• Use AI coding assistants as a daily part of your workflow to move faster and learn quicker.
• Contribute to AI-powered features in our product, from prompt design to integrating AI services into the backend and mobile app.
• Develop good judgment about when to trust AI output, when to verify, and when to solve it yourself.

Code Quality and Continuous Learning:

• Participate in code reviews on both backend and Flutter changes, and write tests for the code you contribute.
• Fix bugs and improve performance with guidance from the team.
• Actively build skills across the stack and bring back useful patterns and tools you come across.

You won't know all of this on day one, and that's fine. We expect you to grow into areas like IoT and MQTT, event-driven systems, Kafka, and Keycloak with support from the team.

• Thai nationals only!
• Bachelor's degree in Computer Science, Engineering, or a related field (or equivalent practical experience).
• Around 1–2 years of development experience, through work, internships, or substantial personal projects. Exposure to both backend and mobile is a plus, but we don't expect depth in both yet.
• Working knowledge of at least one backend language (Java preferred) and familiarity with REST APIs.
• Some experience with Flutter, or with another mobile framework and a genuine interest in picking up Flutter.
• Familiarity with relational databases (PostgreSQL) and/or document databases (MongoDB).
• Exposure to any of the following is a plus, but not required: Keycloak, MQTT, Kafka, event-driven systems, IoT, Docker, or Kubernetes.
• Good analytical, problem-solving, and critical-thinking skills.
• A team player who takes ownership of their work and cares about quality.Curiosity and willingness to learn across the stack, from mobile UI to backend services to IoT.
• English (able to communicate within an international team).
• Hybrid work in our Surawong, Bangkok office.

Why Join Us?

You’ll be part of a purpose-driven, multicultural team working on innovative solutions in one of the world’s most important industries. This is a great opportunity to grow professionally in a fast-paced startup environment.

Also, we provide:

• A competitive salary and other perks.
• Employee Stock Options (ESOP) to financially participate in the success of the company.
• Flexible work environment (e.g. office hours) with a focus on results.
• Meaningful work in an award-winning startup with the opportunity of creating real impact.
• Close collaboration with the leadership team and low hierachies.
• International work environment in a great team of 10+ nationalities.
• Very steep learning curve due to our open and performance-based culture.
• Great offices in central locations

Make it matter - Join HydroNeo and turn your ideas into impact.