Senior Full Stack Developer - Johannesburg

DataFin was established in 1999. We pride ourselves on the fact that we have established relationships with industry leaders and a vast majority of our business is repeat business.Duties & Responsibilities ENVIRONMENT: A cutting-edge AgriTech company is seeking an experienced Senior Full Stack Developer to drive the end-to-end development of their core AgriTech SaaS platform. In this role, you will bridge the gap between user-facing interfaces and backend infrastructure, taking full ownership of feature delivery from database design to UI implementation. They value pragmatic, sharp problem solvers who enjoy building scalable systems that bring tangible value to the agricultural sector. Beyond hands-on development, you will help lead architectural decisions, optimise cross-layer performance, and foster technical excellence across the engineering team. DUTIES: • Full-Stack Feature Ownership: Design, build, and maintain end-to-end applications across the full lifecycle, connecting Angular/Flutter frontends with Ruby on Rails backend APIs using GraphQL (main stack) • Architecture & Performance: Lead architectural design for scalable frontend and backend systems, ensuring low latency, clean code separation, and efficient network communications. • Data Strategy & Infrastructure: Manage full-lifecycle deployments on AWS and Heroku. Optimize relational databases (PostgreSQL), design efficient schemas, and research advanced storage concepts (e.g. hashing, sharding) and distributed ETL processing. • UI/UX & Product Collaboration : Partner closely with UI/UX designers and product owners to translate complex user workflows into responsive, intuitive web and desktop interfaces (utilising Tailwind CSS). • Technical Leadership & Culture : Conduct deep-dive R&D, maintain high engineering standards through code reviews and continuous CI/CD improvement, and mentor team members via workshops and collaborative technical discussions. REQUIREMENTS: Formal Qualifications • Preferred: Bachelor’s degree in Computer Science, Software Engineering, Mathematics, or Information Systems (or equivalent practical experience). Knowledge, Skills & Experience • They require that you have a passion for working in/learning the below, and proficiency is beneficial. Experience &Technical Proficiency • Seniority : 5+ years of software engineering experience delivering full-stack, production-grade applications. • Frontend : Strong experience building production webapps with a modern component framework such as Angular, React, or Vue, using TypeScript or another statically typed language. Experience with utility-first CSS frameworks like Tailwind. • Backend : Strong experience designing and building production APIs in a mature server-side framework such as Ruby on Rails, Django, Laravel, or Node. Experience with GraphQL or a comparable API layer is a plus, as is a track record of picking up a new backend language quickly. • Data & Analytics : Advanced SQL experience; familiarity with ETL data processing pipelines and alternative storage engines. • Cloud & DevOps: Hands-on experience with Heroku, AWS services, Docker (local development), and GitHub (CI/CD pipelines, version control). ATTRIBUTES: • Strong full-stack architectural mindset, debugging skills, and system design capability. • Agile development experience with a track record of balancing multiple projects and shifting priorities. • Multi-tenancy: experience designing and implementing multi-tenant architectures, with a deep understanding of data separation, tenant provisioning, and resource optimization. • Clear written and verbal communication skills with a collaborative, knowledge-sharing approach. • Open-source contributions or participation in software development communities are a plus. • A natural problem-solver who thrives on untangling complex technical challenges and turning ambiguity into elegant, scalable code. Desired Experience & QualificationSenior, Full, Stack, Developer, Johannesburg