Rillet is an AI-native ERP, essentially a general ledger and accounting platform built to replace NetSuite and Sage Intacct at fast-growing companies. Founder and CEO Nicolas Kopp ran N26’s US business before starting Rillet, and co-founder Stelios Modes leads the technical side. The company launched in 2024, raised a $25M Series A led by Sequoia in May 2025, then a $70M Series B co-led by a16z and ICONIQ just twelve weeks later (August 2025), with reports putting the valuation around $500M. It signed 200+ customers in its first year and partners with accounting firms like Armanino. That business shapes the interviews: this is software where a rounding error or a double-posted journal entry is a customer-losing bug, so the loop leans hard on correctness, data modeling, and production judgment rather than algorithm puzzles.
Process
Public interview data on Rillet is thin, which is expected for a company this young: a handful of Glassdoor reviews, two backend phone screen reports on 1Point3Acres from 2026, and aggregator summaries. Piecing those together with the job postings, the loop for engineers looks like this: a 30-minute recruiter screen covering background and logistics, a hiring-manager round that digs into past backend projects, production systems you owned, and the technical decisions behind them, a practical take-home exercise, and a technical interview with collaborative coding plus backend system design. Candidates describe the take-home as a realistic build task judged on code quality, problem-solving, and whether the result is maintainable, rather than on algorithmic cleverness. Expect the whole cycle to run two to three weeks; Series B startups that are actively scaling engineering tend to move fast when they like you, and Rillet’s postings go through Ashby with a dedicated recruiting team in place. Roles are hybrid in New York (HQ at 160 Varick St), San Francisco, and Barcelona, with postings describing Tuesday and Thursday in office plus one flexible day. Fully remote appears to be the exception, so confirm location expectations on the first call.
What they actually ask
- Take-home build exercise. A scoped, practical assignment, reportedly graded on code quality, system thinking, and maintainability. Treat it like production code: tests, clear naming, a short README explaining tradeoffs.
- Backend phone screen coding. The 1Point3Acres reports are both backend technical phone screens: practical coding in your language of choice rather than trivia. Brushing up on coding patterns still helps for the live rounds, but data manipulation and API design matter more here.
- Backend system design. Expect design questions shaped by the product: modeling a ledger or revenue-recognition pipeline, idempotent ingestion of events from Stripe or Salesforce, keeping balances consistent, and reporting on top of a general ledger.
- Deep walkthrough of past work. The hiring-manager round centers on real systems you built, why you made the choices you did, and how you handled production incidents and tight deadlines.
- AI tooling fluency. Postings explicitly require actively incorporating AI tools into your daily workflow. Be ready to describe concretely how you use coding agents or LLM features, and for Applied AI roles, how you evaluate LLM output over financial data where hallucination is unacceptable.
- Values and motivation questions. Why fintech, why accounting software, how you collaborate, and stories about speed and ownership. Their stated values are extreme collaboration, speed wins, and pride in the craft, so shape your behavioral answers around shipping fast without cutting corners.
Levels and comp (2026)
Rillet is too small for a levels.fyi page, and titles are flat: Software Engineer, Software Engineer (Platform), Applied AI Engineer, plus a few Engineering Manager openings. The best public anchor is a late-2025 Software Engineer posting for SF/NYC listing $160K to $200K base plus equity for someone with 2+ years of experience; senior and staff-equivalent offers should land meaningfully above that, and aggregator sites showing sub-$110K averages are almost certainly polluted by non-engineering roles. Equity is the real variable at a company reportedly valued around $500M that raised over $100M in under a year: ask the recruiter for the exact base range for your level, the number of options and current strike price, the latest preferred price, and the vesting schedule. Benefits per postings include strong health coverage (90% for dependents), flexible PTO, and hybrid offices. There is no public signal of geo-adjusted bands, so if you are comparing against Big Tech, the base will look reasonable and the upside case rests on the equity.
Prep priorities
Put most of your time into the take-home and the design round, because that is where Rillet differentiates candidates. For the take-home, practice building a small, well-tested service in a few hours: clean boundaries, error handling, a data model you can defend. For design, study double-entry bookkeeping basics (debits, credits, immutable journal entries), then work through ledger-flavored design problems: exactly-once event ingestion, reconciliation, audit trails, and reporting queries over large transactional tables. The stack is TypeScript, Node, and React with Kubernetes, and at least one posting values JVM experience (Kotlin or Java), so be fluent in one backend language and comfortable talking through typed code. Do enough standard coding interview reps to be quick on arrays, maps, and string processing, but skip the hard dynamic-programming grind. Finally, prepare three or four crisp stories about owning a feature end to end, shipping under a deadline, and a production incident you handled, and have a specific answer for why accounting software interests you. Founders at this stage interview for conviction, and generic answers stand out in a bad way.
Frequently Asked Questions
Is the Rillet interview LeetCode-heavy? Reports suggest no. The loop centers on a practical take-home, collaborative coding, and backend design. Standard data-structure fluency is enough; save the hard algorithm prep for other companies in your pipeline.
Can I work remotely at Rillet? Mostly no. Postings describe a hybrid setup with Tuesday and Thursday in office plus one flexible day, anchored in New York, San Francisco, and Barcelona. Some listings mention remote flexibility, so ask early rather than assuming.
How long does the process take? Expect two to three weeks from recruiter screen to offer if you turn the take-home around quickly. The company moves fast and hiring managers are closely involved, so slow responses usually mean a no rather than a backlog.
What is the work culture like? Mixed but intense. Glassdoor reviews (a small sample of about ten) praise smart colleagues, autonomy, and growth, while a few describe burnout and abrupt terminations. Work-life balance rates around 3.0 and career opportunities around 4.5. It reads like a classic post-Series-B sprint: high pace, high ownership, and worth asking your interviewers directly about hours and on-call.
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