Software Engineer, Tax

Who is Aiwyn and what do we do? Aiwyn is the first complete platform for modern Accounting Firms. Backed by top-tier investors like Bessemer, KKR, and Revolution, we're one of the fastest-growing scale-up SaaS companies in the world. We build category-defining technology, and we're doing it with world-class people, processes, and products. To learn more, visit our website We work with the majority of the Top 500 firms in the country. We're replacing 40-year-old tax engines and brittle integrations with software accounting firms can actually trust, and we have rare product-market fit in an industry that's about to change permanently. We're hiring a senior software engineer to join the team that owns our tax engine: the calculation core that's already filed over a million returns and is now the wedge that lets us own the entire return end to end. The role The tax engine is one of the most strategic pieces of IP at Aiwyn, and the foundation we're opening up to AI labs and modern firms who want a tax engine they can build on top of. We built TaxCalcBench , which has become how the AI labs measure their frontier models on tax calculation, and Anthropic came to us to ship Aiwyn Tax as a