# Fullstack AI-Native Engineer (Fintech) | Miyagami

> Fullstack AI-Native Engineer (Fintech) at Miyagami, Vietnam. We’re building financial infrastructure where a duplicated payment or a ledger that doesn’t…

Source: https://www.miyagami.com/careers/fullstack-ai-native-engineer-fintech

[Home](https://www.miyagami.com/)/ [Careers](https://www.miyagami.com/careers)/ Fullstack AI-Native Engineer (Fintech)

# Fullstack AI-Native Engineer (Fintech)

Development Vietnam Flexible Full-time

[Apply for this role](https://hiringmiyagami.tickup.vn/jobs/fullstack-ai-native-engineer-fintech) [All vacancies](https://www.miyagami.com/careers)

We’re building financial infrastructure where a duplicated payment or a ledger that doesn’t balance is a serious incident. We need a fullstack engineer with deep backend and payments experience, who works with AI agents every day and takes full responsibility for what ships.

What You’ll Do

- Build and own high-performance backend services in Node.js and TypeScript for payment flows, including asynchronous workflows and webhook processing
- Integrate with external fintech APIs and handle their real-world behavior: retries, timeouts, out-of-order events, and partner downtime
- Design idempotent payment processing and transaction handling on PostgreSQL that holds up under heavy concurrency
- Build and maintain immutable ledger and reconciliation logic so the numbers always add up
- Deliver the frontend for these features in React.js and TypeScript, and make system design decisions across the stack
- Design and run AI orchestration and multi-agent workflows, including task delegation, context management, and validation of agent outputs
- Use AI tools and agents across coding, debugging, testing, documentation, and code review
- Verify everything AI produces before it reaches production. You own the result, whoever or whatever wrote the first draft
- Raise blockers, risks, and unclear requirements early with the team instead of guessing

## What you bring

- Expert-level experience building high-performance backend systems with Node.js and TypeScript, including asynchronous workflows and webhook engineering
- Hands-on experience integrating external fintech APIs in production
- Expert knowledge of PostgreSQL transactions, isolation levels, locking, and concurrency
- Proven experience designing idempotent payment processing
- Strong system design skills
- Good knowledge of financial systems: transactions, immutable ledgers, and core accounting concepts (double-entry, balances, settlement)
- Working familiarity with BaaS, CaaS, Open Finance, and reconciliation
- Solid frontend skills in React.js and TypeScript, able to deliver features end to end
- Hands-on experience with AI orchestration and multi-agent workflows, including managing context across concurrent agent tasks
- Daily, practical use of AI tools and agents, with a real example of catching an AI mistake before it shipped
- Proficient English communicator experienced in collaborating across distributed, remote teams

Nice to Have

- Experience with payment providers, card networks, or banking partners
- Background in compliance-heavy environments (audit trails, PCI, KYC/AML)
- Experience with agent context files (e.g., [CLAUDE.md](http://CLAUDE.md)-style) and persistent-memory tooling for agents

## Skills

Backend Development Asynchronous Workflows Webhook Engineering Fintech API Integration PostgreSQL Database Transactions Idempotent Payment Processing System Design Financial Systems Immutable Ledgers Double-Entry Accounting Reconciliation BaaS CaaS Open Finance Frontend Development AI Tools AI Agents English (C1) IELTS 7.0+

How we assess

Two sixty-minute assessments, one with AI tools off and one with your own agents running. Both are scored on the same scorecards we use for every placement.

[How we vet](https://www.miyagami.com/how-we-vet)

Other vacancies

- [General Accountant](https://www.miyagami.com/careers/general-accountant-2)
- [Staff AI-Native Engineer (Node.js / React, Backend-Heavy)](https://www.miyagami.com/careers/staff-ai-native-engineer-node-js-react-backend-heavy)
- [Fullstack AI-Native Developer](https://www.miyagami.com/careers/fullstack-developer-senior)

Where we work

Amsterdam, London, Ho Chi Minh City and Da Nang.

[Our offices](https://www.miyagami.com/locations)

Let's talk

## Get a shortlist within three days

You share the roles and the stack in a short form or a thirty-minute call. Within three working days you get named senior engineers to review, each with both scorecards, and you can hire within five.

[Get a shortlist](https://www.miyagami.com/shortlist)

Reviewed on **Clutch** 39 reviews

[ISO 27001
Certified](https://trust.miyagami.com/)

Book thirty minutes with Dale

The calendar is provided by HubSpot, which sets its own cookies. Load it here, or book on HubSpot's page.

[Open booking page](https://sales.miyagami.com/meetings/dwesdorp)