Staff Software Engineer

Onshore•New York, NY

10d•Onsite

About The Position

Onshore is seeking a Staff Software Engineer to define and drive technical strategy, own end-to-end technical solutions, and lead infrastructure investments. This role is a technical leadership position with no direct reports by default, focusing on influence through architecture, code, and technical direction. The Staff Engineer will make principled build-versus-buy decisions, produce technical roadmaps, advise leadership on technical trade-offs, and multiply the team's effectiveness through their contributions.

Requirements

8+ years of software engineering experience, with demonstrated impact at staff or equivalent scope: leading initiatives across multiple teams or systems.
A proven track record designing and shipping systems that are both highly available and correct, in domains where wrong output has consequences.
Deep architectural judgment paired with genuinely fast hands. You prototype to think, and your strategy shows up as code.
The ability to influence technical direction and align teams without direct authority, with excellent written and verbal communication across engineering and leadership.
High ownership: comfortable with ambiguity, able to define the problem and the plan rather than execute a predefined spec.
Able to work in person at our New York City office.

Nice To Haves

Experience making LLM-powered systems production-reliable: agents, evaluation infrastructure, structured extraction at scale. You know the distance between a demo and a system users rely on.
Experience owning platforms other teams built on, and the judgment about primitives versus one-offs that comes with it.
Compliance-aware system design: audit trails, data lineage, financial controls, or regulated-domain experience.
Experience with correctness-critical computation: ledgers, billing, rules engines, or anything compiler-shaped.
A track record of raising senior engineers through technical direction and of contributing meaningfully to hiring and engineering culture.

Responsibilities

Define and drive the technical strategy for one of Onshore's three pillars, including multi-year architecture decisions across agent infrastructure, tax computation, and data pipelines.
Own end-to-end technical solutions for the systems that can't be wrong: durable agent workflows, versioned tax computation, evaluation infrastructure, filing pipelines.
Identify and lead the infrastructure investments that unlock what's next: new study types, new entity and state coverage, and higher leverage for the operators who run engagements.
Make principled build-versus-buy decisions and produce technical roadmaps that balance near-term delivery against long-term platform health.
Advise the founders and engineering leadership on technical trade-offs and their downstream implications for the business.
Multiply the team: your primitives, designs, and reviews raise what every other engineer ships.