Private Agent Runtime Engineer

HushOne, Inc.; Kirkland (WA); On-site; USD 120,000 - 190,000; Full time

Benefits offered by this job

Stock options

Annual bonus

Health, dental and vision insurance

401(k) with company match

AI tokens budget

Gym membership

Remote-friendly / flexible work

Referral program

Job summary

HushOne, Inc. is seeking a strong backend/systems engineer with practical agent experience to design and implement durable workflows, including tool calls, background tasks and human approvals.

You will ensure a single authoritative identity per user, while enabling constrained workers and visible handling of cancellations and external outcomes. The ideal candidate can articulate actions after execution, demonstrates careful handling of retries and secrets, and focuses on preventing irreversible

Qualifications

• Strong backend or systems engineering, plus practical agent work.
• Careful handling of retries, secrets, and external side effects, with examples.
• You design so an action can be explained after the fact, not just executed.
• You treat an irreversible side effect as something to be deliberate about.

Responsibilities

• Implement durable execution, tool calls, background jobs, checkpoints and human approvals.
• Keep one authoritative identity and policy domain per user while allowing constrained workers.
• Enforce permissions outside the model and make cancellation, revocation and uncertain external outcomes visible.

Skills

Backend engineering

Agent experience

Retries and secrets handling

Explainable actions

Job description

You build the part of Private Agent One that turns a person's intention into completed, inspectable work. Inspectable is the load-bearing word: the person has to be able to see what their agent did and why, which shapes the runtime more than any performance requirement does.

The work:

Implement durable execution, tool calls, background jobs, checkpoints and human approvals. Keep one authoritative identity and policy domain per user while allowing constrained workers. Enforce permissions outside the model and make cancellation, revocation and uncertain external outcomes visible.

What good looks like:

In your first 90 days, ship a useful workflow that survives interruption, requests approval at the right boundary and explains the actions it completed.

Evidence we look for:

Bring strong backend or systems engineering and practical agent experience. Show attention to retries, secret handling and external side effects.

Required:

• Strong backend or systems engineering, plus practical agent work
• Careful handling of retries, secrets, and external side effects, with examples
• You design so an action can be explained after the fact, not just executed
• You treat an irreversible side effect as something to be deliberate about

Nice to have:

• Workflow or orchestration engine experience
• Idempotency and exactly-once semantics in practice
• You have built an audit trail somebody actually used

The exercise:

Design a workflow where the user revokes permission while an external task is still running, including the limits of recall.

How we work:

We work together in the office, five days a week, and you can be based at any of our garages: Kirkland Garage (Kirkland, WA); UAE Garage (Dubai, Dubai). We hire across the United States, India and the UAE. We are remote-friendly around family: if you need to work from home some days to look after the people you love, we arrange that with you one person at a time, and we encourage people to use it rather than tough it out.

Pay:

We publish what we pay. Indicative ranges by market and level are on our compensation page, and they are realistic going market rates rather than headline numbers. Wherever we hire we pay at least the local market rate, and for full-time roles our floor is a living wage, never the statutory minimum. Compensation is reviewed every year and on promotion.

Equity:

Every full-time teammate gets stock options. Four-year vesting with a one-year cliff, sized to role, level and impact, and confirmed in writing at offer. High performers earn refresh grants.

Bonus and commission:

An annual performance bonus tied to clear company and personal goals, indicatively 10 to 20 percent of base for non-sales roles. Customer-facing roles carry on-target earnings, typically a 50/50 split of base and variable, with uncapped commission and accelerators above quota.

Health and peace of mind:

Medical, dental and vision for you and your family, plus life and disability cover. We have chosen the highest plan tier available to us rather than the cheapest one that clears the bar, because the point of this is that you never have to think about it. The specific plan numbers are confirmed in your offer letter.

401(k) with company matching:

A 401(k) with a company match, so the years you spend here compound into something that is yours whatever happens next. The match formula is confirmed in your offer letter.

AI tokens:

A budget of AI tokens of your own, because a company that says you should own your AI cannot be the company that rations it. Use them on the work and on whatever you are curious about.

Gym, and the everyday things:

A gym membership, and a corporate benefits programme with its own app, where you redeem real discounts with a long list of retailers on the ordinary purchases of a life.

Family:

We are remote-friendly around your family, arranged one person at a time, and we would rather you took it rather than toughed it out.

Referrals:

Refer someone we hire full-time who stays a year and you get $1,000 plus $10,000 in referral stock-based equity, on top of your own package.