Staff Software Engineer

About Us At algo1, we are reinventing one of the world’s most familiar experiences: the in-store grocery trip. We are building an AI-native product that understands each shopper, responds to their context in real time and makes an everyday experience less stressful, more personal and more engaging. We’re backed by leading investors and founded by two entrepreneurs: one with a track record of building and scaling companies, and the other a leader in retail data and shopper analytics. Together, they have brought together frontier AI researchers and engineers, product and strategy leaders, and senior operators from major UK and US grocery businesses. The people who join now will have an opportunity to shape the product, the engineering culture, and what algo1 becomes. The Role We are looking for a Staff Engineer to own the full-stack development of algo1’s retailer- and brand-facing product suite. You will be the primary engineering partner to our Head of B2B Product, James, turning ambitious and sometimes ambiguous product ideas into software that retailers and consumer brands rely on to create, launch, and measure campaigns. This is a product engineering role, not an infrastructure or platform architecture role. You will be responsible for building the core B2B experience that enables retailers and brands to bring their campaigns onto algo1’s in-store product. The quality of this software directly impacts the shopper experience. It is the layer through which offers and campaigns move from retailers and brands onto the in-store product. Getting this right means helping shoppers discover more relevant content while giving retailers and brands the tools to understand what works. You will own the customer-facing web application and the backend systems that power it, including campaign creation, offer management, retailer onboarding, permissions, reporting, performance measurement, and the integrations that allow promotional and EPOS data to flow into and out of the platform. You will work closely with product, design, and platform engineering teams, but you will be accountable for taking the B2B product from early concepts through to customer adoption, continuously improving it as we scale with retailers and brands. What You'll Own The most important requirement is clear evidence that you have personally built and shipped complex, customer-facing B2B software used by real customers. - Own the B2B product area end to end, from early product definition and technical design through implementation, release, and iteration. - Build intuitive retailer- and brand-facing web experiences using React and TypeScript. - Develop the backend services and APIs that power campaign creation, management, reporting, and customer administration. - Act as the senior engineering counterpart to the Head of B2B Product, helping shape scope, resolve ambiguity, set delivery cadence, and make effective product and technical trade-offs. - Integrate with platform services built by our Platform team, extending them where needed rather than duplicating platform capabilities within the B2B product. - Own retailer-facing integration touchpoints, including the flow of promotional and EPOS data into the system and campaign or performance data back out to customers. - Design reliable integrations using APIs, webhooks, authentication, and data synchronisation patterns. - Build responsive product experiences, including asynchronous and bi-directional interactions where they create meaningful customer value. - Establish strong engineering standards within the B2B product area while remaining pragmatic about what needs to be built now and what can evolve over time. - Use modern AI development tools to accelerate prototyping, implementation, testing, and iteration while maintaining strong engineering judgement and quality. About You Must Have - Full stack with backend depth. Professional software engineering experience across the stack, with your strongest work in the bac…