About the role

Onshore builds AI-native tax software for the people who build America. Farmers, manufacturers, and founders do the R&D that moves this country forward — and most never get the credit they've earned. We're fixing that: our agents do the analysis that used to take CPAs weeks, our experts review it, and our customers get their money back. We started with R&D tax credits and are expanding into agricultural incentives, corporate tax returns, and other tax incentives.

We're hiring a Senior Software Engineer to lead technical work across the platform and raise the bar for everyone around them.

What you'll do

Architect and ship complex systems across our stack: TypeScript end-to-end, Bun + Hono on SST v3 (Lambda, ECS/Fargate, SQS), Aurora Postgres with Drizzle, Vite + React on the front.
Lead one of our four platform builds: the core R&D credit engine, agriculture incentives, corporate tax and compliance (versioned calc graph, MeF e-file), or agentic infrastructure (verification layers, evals, RAG over primary tax authority).
Design agent workflows where wrong answers have real consequences — verification, calibration, and audit-defensibility are the product.
Mentor engineers at every level, lead design reviews, and shape engineering practice as we scale from \~10 toward 20.
Partner directly with founders, tax experts, and customers to turn ambiguous problems into shipped product.

Our stack

TypeScript end-to-end — Bun + Hono services, Vite + React (shadcn, Tailwind) on the front.
SST v3 on AWS: Lambda, ECS/Fargate, SQS, Step Functions.
Aurora Postgres with Drizzle ORM, Pinecone for RAG, Clerk for auth.
Frontier LLMs powering extraction, analysis, and agent workflows.

You should have

5+ years building production software, with deep full-stack experience.
Strong systems judgment — you've owned architecture decisions and lived with their consequences.
Experience shipping LLM-powered products, data pipelines, or high-stakes automation is a strong plus.

Compensation

$225k base
equity
Full benefits

About the company

Onshore is a technology company that is changing the tax consulting industry. We have developed artificial intelligence software that automates many of the tasks performed by tax consultants. This gets much more exciting when you consider that tax consultants earn more than $10 Billion in fees each year. That's a market worth transforming!

What is tax consulting? Good question.
Tax consultants are tax experts that analyze one or two numbers that go on a company's tax return. For example, the R&D tax credit. The rules for the R&D tax credit are very complex and most accountants do not have the expertise to compute the credit. So a company will hire a tax expert to compute the R&D tax credit for the company. That's tax consulting.