• Redesign the webhook processing architecture to support 10x growth. • Architect a new abstraction layer that decouples internal subscription models from Shopify order primitives. • Lead a technical deep-dive on Shopify GraphQL bulk operations and performance tradeoffs. • Write an RFC defining the next generation of Stay’s integration framework. • Review critical infrastructure PRs and guide engineers on distributed systems design. • Implement new APIs and services to unlock the next generation of subscription management and analytics features for merchants. • Design and develop internal tooling when you see opportunities to better enable yourself and other engineers. • Collaborate with your teammates on Eng, Design and Product Management to plan and execute on new projects.

• Develop robust service logic to expose AI models via RESTful APIs using frameworks such as FastAPI or Flask • Collaborate with data scientists, engineers, and product teams to translate business requirements into technical solutions • Work within Azure cloud infrastructure, leveraging containerised environments for scalable and reliable deployments • Support model lifecycle management using tools such as Databricks Mosaic AI and AI Foundry, ensuring governance, traceability, and performance monitoring • Implement data preprocessing pipelines and feature engineering workflows • Ensure codebases are secure, scalable, maintainable, and aligned with software engineering best practices • Monitor deployed models and services, iterating based on performance metrics, feedback, and evolving requirements • Maintain clear documentation and appropriate testing coverage for all developed components • Contribute to shared design, development, deployment, and monitoring practices within cross-functional agile teams

This description is a summary of our understanding of the job description. Click on 'Apply' button to find out more. Role Description We are seeking a very senior Backend Engineer with expert-level experience in Node.js, TypeScript, and serverless AWS architecture. You’ll own core backend systems that power our neobank: payments, wallets, secure authentication, event-driven pipelines, and streaming infrastructures. You’ll work at the intersection of fintech, blockchain, event streaming, and AI, designing mission-critical systems with strong security, compliance, and performance guarantees. This role is ideal for engineers who thrive in fast-moving, high-ownership environments and love pushing what’s possible with AI-assisted development. Key Responsibilities - 10+ years of software engineering experience, with a strong backend record. - Deep expertise in Node.js + TypeScript building distributed systems or financial platforms. - Strong hands-on experience with serverless AWS (Lambda, API Gateway, DynamoDB, Kinesis, EventBridge, Cognito). - Experience designing secure, compliant financial flows (payments, wallets, KYC, auth, etc.). - Solid understanding of real-time protocols: WebSockets, SSE. - Familiarity with stablecoins, blockchain payment flows, or modern payments APIs. - Able to contribute to React Native when needed (not the main focus). - Comfortable in an engineering environment where AI is actively used every day. - Passion for pushing the frontier of AI-driven development, not just adapting to it. Qualifications - 10+ years of professional software engineering experience. - Deep expertise in Node.js + TypeScript, building distributed or financial systems. - Strong hands-on experience with serverless AWS: Lambda, API Gateway, DynamoDB, Kinesis, EventBridge, and Cognito. - Experience designing secure, compliant financial flows (payments, wallets, KYC, identity, auth). - Solid understanding of real-time protocols (WebSockets, SSE). - Familiarity with stablecoins, blockchain transaction flows, or modern payment APIs. Requirements - Ability to contribute to React Native when necessary. - Comfortable in high-AI-usage engineering environments. - Passion for pushing the frontier of AI-driven software development. Benefits - Build a world-class, AI-powered fintech infrastructure platform. - Work in a modern unified TypeScript stack across backend and mobile. - Shape the future of AI-driven engineering workflows. - Solve complex challenges in payments, blockchain, event streaming, reliability, and security. - Join a senior, globally distributed team that values ownership, excellence, and innovation. Interview Process - Introduction with CTO and Head of Engineering. - Technical interview + take-home assessment (45–60 min).

Who We Are Freedx is a newly established cryptocurrency exchange dedicated to providing a seamless, secure, and innovative trading experience. Our team comprises experienced professionals from the crypto, finance, and technology sectors, all passionate about driving the future of digital finance. At FreedX, we are committed to creating a platform that empowers our clients with the freedom to manage their digital assets confidently and efficiently. Our Vision: At Freedx, our vision is to be the most trusted and reliable cryptocurrency exchange, offering unparalleled freedom and scalability to our clients. We aim to build a platform where users can trade and manage their assets with complete peace of mind, knowing that their security and reliability are our top priorities. We strive to continuously innovate and adapt to the evolving needs of the crypto market, ensuring that our clients have access to the best tools and services to achieve their financial goals. Join us on our journey to redefine the standards of digital asset trading and experience the freedom, reliability, and scalability that Freedx has to offer. Role We are seeking an experienced and passionate Senior .NET Backend Developer to join our team and help shape the backend infrastructure of a cutting-edge cryptocurrency exchange platform. As a Senior Backend Developer, you will be responsible for designing, developing, and optimizing our core systems to support high-frequency trading, secure transaction processing, and real-time data flow. This is a unique opportunity to work at the forefront of the crypto industry, leveraging your expertise in .NET to build scalable and efficient systems that meet the demands of a fast-growing, high-performance exchange. Key Responsibilities Design & Development: Lead the design and development of backend services and microservices using .NET (C#) to support trading, transaction processing, and account management in a high-availability, low-latency environment. Architecture & Optimization: Architect efficient and scalable solutions for core exchange functions, including order matching, wallet management, and payment gateways. API Development: Create and maintain RESTful APIs and WebSocket services to facilitate seamless data communication with frontend applications and third-party integrations. Security & Compliance: Implement security best practices to protect user data and transactions, and ensure compliance with industry standards and regulatory requirements. Requirements Required Skills & Experience Technical Proficiency: 5+ years of experience in backend development using .NET Core and C# . Strong experience with microservices architecture and cloud-based services (e.g., AWS, Azure). Proficient in SQL and NoSQL databases , with hands-on experience in data modeling, query optimization, and high-volume data processing. API Development: Extensive experience in developing secure and scalable RESTful APIs and WebSocket-based services. Crypto Knowledge: Basic understanding of blockchain, cryptocurrencies, and the crypto trading ecosystem is highly desirable. Security Awareness: Knowledge of security practices, encryption standards, and compliance relevant to the financial or crypto sectors. Analytical Skills : Strong problem-solving skills and an ability to work in a fast-paced, agile environment. Collaboration: Excellent communication and team collaboration skills to work with cross-functional teams including frontend developers, DevOps , and product managers. Preferred Qualifications Experience with high-frequency trading platforms or real-time financial systems Familiarity with message brokers like Kafka or RabbitMQ Previous experience in a fintech or crypto environment Familiarity with CI/CD pipelines and DevOps practices Benefits What We Offer: Competitive salary Generous paid leave Opportunity for professional development, participation to industry events Flexible payment options - choose to be paid in traditional currency or cryptocurrency. High-impact environment - your work directly shapes our growth and success. Close collaboration with the founders, experienced leaders and cross-functional teams. Freedx is an equal opportunity employer. We stand for an open and inclusive work environment that fosters the well-being of everyone. We embrace and encourage differences in age, color, disability, ethnicity, family or marital status, gender identity or expression, language, national origin, physical and mental ability, race, religion, sexual orientation, socio-economic status, veteran status, and other characteristics that make our people unique.