Full Stack Engineer – Fintech MVP

Twine; New Zealand; On-site; NZD 120,000 - 180,000; Full time

Job summary

Twine is seeking a senior full-stack engineer to deliver a production-quality MVP for a consumer financial app. You will transform a product vision into a scalable solution, enabling users to connect accounts, gain insights, and act on opportunities.

You will review the existing codebase, align implementation with product decisions, and lead the development with a small team, using React Native/Expo, Node.js, PostgreSQL, and Flinks for integrations.

Qualifications

• Senior lead for fintech app development with MVP delivery.
• Expertise in React Native/Expo, Node.js, and PostgreSQL.
• Knowledge of data privacy, consent management, and auditing.
• Experience integrating third-party APIs (e.g., Flinks).
• Ability to review and align code with product vision.

Responsibilities

• Lead the end-to-end development of a consumer financial app MVP
• Review and align repository and requirements with product vision
• Implement secure sign-in, consent capture, and account connection via Flinks
• Develop account-data ingestion, event, and audit recording features
• Oversee mobile onboarding and user experience flows
• Integrate third-party APIs and ensure privacy and regulatory compliance
• Establish and maintain code review, testing, and documentation processes
• Prioritize MVP features and manage timelines for the 90-day delivery
• Collaborate with engineering, QA, and design teams

Skills

Senior full-stack

React Native

Node.js

PostgreSQL

API integrations

Data privacy

Consent management

Audit trails

Leadership

Problem solving

Tools

Flinks

Job description

Join a dynamic project as a senior full-stack engineer to deliver a production-quality MVP for a consumer financial application. This role involves transforming a defined product vision into a robust, scalable solution that enables users to connect their financial accounts, gain insights, and act on financial opportunities. You will be responsible for reviewing the existing codebase and requirements, aligning technical implementation with product decisions, and leading the development process. The tech stack includes React Native/Expo for mobile, Node.js for backend, PostgreSQL for data storage, and integration with third-party APIs such as Flinks. You will also establish best practices for code review, testing, and documentation, while supporting a small team of engineers, QA, and designers. Experience with data privacy, consent management, audit trails, and regulated fintech or open-banking products is highly valued. The project aims for MVP delivery within 90 days.

Responsibilities

• Lead the end-to-end development of a consumer financial app MVP
• Review and align existing repository and requirements with product vision
• Implement secure user sign-in, consent capture, and account connection via Flinks
• Develop robust account-data ingestion, event, and audit recording features
• Oversee mobile onboarding and user experience flows
• Integrate third-party APIs and ensure compliance with privacy and regulatory standards
• Establish and maintain code review, testing, and documentation processes
• Prioritize MVP features and manage timelines to meet the 90-day delivery goal
• Collaborate with engineering, QA, and design team members

Skills And Requirements

• Proven experience as a senior full-stack engineer or technical lead, ideally in fintech or open-banking environments
• Expertise in React Native/Expo, Node.js, PostgreSQL, and API integrations
• Strong background in data modeling, privacy, consent management, and audit trails
• Familiarity with regulated financial products and external provider integrations (e.g., Flinks)
• Ability to review and enhance existing codebases and documentation
• Excellent problem-solving, communication, and leadership skills
• Experience establishing practical review, testing, and documentation processes
• Ability to work independently and collaboratively within a small, cross-functional team
• Availability to deliver MVP within a 90-day timeframe

About Twine

Twine is a leading freelance marketplace connecting top freelancers, consultants, and contractors with companies needing creative and tech expertise. Trusted by Fortune 500 companies and innovative startups alike, Twine enables companies to scale their teams globally.

Our Mission

Twine's mission is to empower creators and businesses to thrive in an AI-driven, freelance-first world.