• Design and implement secure, PCI-compliant payment processing systems supporting credit cards, ACH, and digital wallets • Build comprehensive transaction lifecycle management including processing, refunds, voids, and settlement reconciliation • Architect and implement integrations with multiple payment processors while maintaining flexibility to switch providers • Develop robust APIs for transaction monitoring, customer management, and merchant administration • Design and optimize database schemas for high-volume transaction processing and real-time reporting • Implement tokenization, encryption, and fraud detection systems meeting PCI DSS compliance requirements • Create RESTful APIs with consistent error handling, authentication, and webhook capabilities • Ensure sub-3-second transaction processing times and system scalability for high-volume periods

Role Description KnowHow is expanding its Software Engineering team to take our development capacity and speed to the next level. The optimal candidate for this role has very high ownership thinking, a demonstrated track record of being a fast learner, and the ability to manage a broad array of demanding overlapping timelines and projects. The candidate should have a strong preference for creative problem solving, an OCD preference for detailed documentation, and pride in delivering high-quality code consistently, on schedule. The purpose of the Full Stack Developer role is threefold: - To increase our development capabilities and capacity - To enable us to implement ‘industry-first’ features, far ahead of any competitors - To enable us to pursue our data, AI, and ML planned features You will be responsible for maintaining, building, and supporting frontend and backend application layers of our product. You will work closely with the core team to solve complex problems to meet customer needs. Other responsibilities include: - Work on improving the system architecture - Analyze and improve the performance of the web apps - Educate and support those around you as well as other developers - Develop basic ML/AI models and integrate them into our product - Familiarity with OpenAI API (or equivalent) is a plus - Basic knowledge of prompt engineering Qualifications - Undergraduate degree or diploma in Computer Science, Software Engineering, or related field - 5+ years of experience in full stack development building large-scale web applications - Strong JavaScript expertise and experience in modern UI frameworks (e.g., React/Redux, ES6) - Extensive knowledge of the DOM, HTTP, CSS3 (e.g., Flexbox, Grid) and core web technology concepts - Extensive knowledge of Python - Ability to dive deep into specific client-side areas, like performance, cross-browser compatibility, animations - Experience with RESTful API design and development - Working knowledge of standard AWS technologies, such as AWS Elastic Beanstalk, ECS, RDS, Elastic Beanstalk, Lambda, CloudWatch - Docker and Postman experience Requirements - Experience with Django - Experience with Hugging Face - Experience working on Agile/SCRUM development teams Benefits - Build cool tech and solve interesting problems with smart, fun people - Casual attire - Fast-paced environment, yet a rigorous discipline to planning - Weekly virtual team social event - Potential for equity compensation - Generous vacation plan - Your code will be used by live users starting week one - Experience in the US-Market (our target market) - Broad variety of development: mobile, web, cloud, AI, ML

• Develop and maintain technical components, services, and integrations that enhance engineering workflow applications. • Build foundational modules, reusable logic, and frameworks that enable scalable application development for Engineering and Operations teams. • Implement end‑to‑end solutions that support internal engineering and operational processes. • Collaborate closely with internal customers to translate functional requirements into robust, maintainable technical solutions. • Partner with development teams and stakeholders to define platform standards, architecture patterns, and best practices for both pro‑code and low‑code contributors. • Use high‑level programming languages (primarily Python) to build scalable enterprise applications. • Architect and deploy solutions using Amazon Web Services (AWS).

• Lead the architecture, design, and implementation of enterprise-scale cloud-native applications and services. • Provide technical leadership across multiple applications, services, and engineering teams. • Design and develop secure, scalable, and maintainable backend services using Node.js, TypeScript, and modern cloud technologies. • Establish and promote engineering standards, architectural patterns, and development best practices. • Partner with product owners, business stakeholders, and engineering leadership to translate business objectives into technical solutions. • Lead technical design discussions and architectural reviews. • Mentor engineers through code reviews, design reviews, technical guidance, and knowledge sharing. • Drive platform modernization initiatives and evaluate emerging technologies for potential adoption. • Design and implement integrations with internal and external systems and services. • Optimize application performance, reliability, scalability, and operational efficiency. • Contribute to long-term technology strategy and technical roadmaps. • Support DevOps practices, automation, observability, and continuous improvement initiatives. • Troubleshoot complex production issues and guide teams toward sustainable solutions. • Collaborate effectively across distributed teams while maintaining strong communication with both technical and non-technical stakeholders.