Sr Software Engineer - Full Stack (City of London)

POSTX's vision is to change the way the world moves goods with zero carbon emissions by providing a transportation and logistics platform that enables our customers to reduce costs, improve service and avoid 100% tailpipe emissions. Our focus is on vertically integrating logistics and transport services using cutting-edge technology that leverages in-vehicle data, geospatial indexing, machine learning, and out-of-the-box methods to optimise sorting, routing, and loading across multiple sites, reducing the overall cost to serve. Our customers are 3PLs, road hauliers, distributors, and logistics providers seeking dedicated fleets or third-party logistics partners to support their decarbonisation goals for middle and last mile road freight. We’re growing fast—with operations live, a successful pilot completed, multi-year contracts secured, and backing from top-tier investors

Join our team and focus on solving the logistics challenges of tomorrow.

We are seeking a skilled and motivated Full Stack TypeScript Developer with a product-focused mindset to join our team. The ideal candidate will have a strong foundation in software development, leadership experience/ potential, experience with modern frameworks and libraries, and a passion for building scalable, high-quality applications. This role involves working across the entire stack, from building user interfaces to building scalable backend services. We prioritise autonomy, empowering the team to take ownership and deliver their best work.

• Proficiency in TypeScript and JavaScript .
• Experience with modern frontend frameworks (e.g., React.js , Next.js ).
• Experience with React Native / Expo and building mobile applications.
• Building scalable systems through event based systems
• Solid understanding of backend technologies, particularly Node.js .
• Familiarity with API development and integration ( REST , GraphQL ) and Nest.js would be a huge benefit.
• Experience with databases ( Postgres / SQL ).
• Knowledge of version control systems, particularly Git .
• Familiarity with cloud platforms ( Vercel , Google Cloud / AWS preferred ) and containerisation.
• Experience with test frameworks such as Jest / supertest.

• Strong problem-solving skills and attention to detail .
• Excellent communication and teamwork abilities.
• Ability to manage time effectively and prioritise tasks.
• Striving for pragmatic delivery through iteration and testing with users.

• Experience working within a startup and any exposure to logistics, geospatial tools such as Uber H3 is a huge plus.
• E xperience using Inngest or similar workflow automation tools.

• Help decarbonize one of the largest sectors in the world.
• Be part of a high-growth company with a bold mission and real traction.
• Work with an ambitious, passionate, and collaborative team.
• Competitive compensation, equity, and performance incentives.
• Opportunity to shape the future of national operations from the ground up.