Nuclearn
Overview
Controller (Head of Accounting) at Nuclearn.ai. Hands‑on, systems‑minded, and ready to build the finance backbone of a mission‑critical AI company. Nuclearn.ai builds AI‑powered software for the nuclear and utility industries to keep critical infrastructure reliable, efficient, and safe. We are hiring a player‑coach Controller to turn momentum into disciplined financial operations: clean closes, accurate invoicing, tight controls, and decision‑ready reporting. You will own GAAP accounting end‑to‑end, stand up order‑to‑cash with rigor, and scale the function as we grow.
The role & impact Reporting to the CFO (founder), you will lead a multi‑facet accounting organization spanning order‑to‑cash (including invoicing), procure‑to‑pay, payroll, monthly close, revenue recognition (ASC 606), audit/tax readiness, and controls that align with our SOC 2 / ISO 27001 posture. This is a working Controller role: you’ll write policies, post JEs, review contracts, close the books, and build the team and systems that make it all run on rails. You will partner cross‑functionally with Sales, Customer Success, Legal, Security, and Product to ensure contracts become correct invoices, revenue is recognized properly, and cash is predictable.
What You’ll Own
Accounting ops & reporting
Own GAAP and the monthly close; publish a close calendar and deliver a consistent ≤ 6‑business‑day close.
Produce a monthly management package (P&L with product/segment views, cash flow, variance notes, KPIs).
Build a rolling 24‑month cash forecast and drive forecast‑to‑actual accuracy.
Order‑to‑cash & invoicing (explicitly yours)
Translate executed MSAs/SOWs into billing schedules by SKU (subscriptions, milestones, T&M).
Issue invoices on time (including utility/public‑sector portals), with correct backup and approvals.
Own revenue recognition policies; draft memos and JE patterns for multi‑element arrangements.
Manage collections (DSO targets, dunning cadence, dispute resolution) and cash application.
Procure‑to‑pay & payroll
Implement AP workflows (vendor onboarding, 2/3‑way approvals where needed, card/expense policies).
Oversee payroll and multi‑state compliance; coordinate benefits and equity accounting with HR/People.
Maintain clean COA, fixed assets, and capitalization thresholds.
Controls, compliance & governance
Stand up a lightweight internal control framework aligned to SOC 2 / ISO 27001 (change control, access, backups, audit trails).
Coordinate tax (federal/state income, franchise, sales/use, 1099s, nexus monitoring) with external firms.
Prepare PBCs and evidence for audits, security questionnaires, and enterprise customer onboarding.
Systems & data
Run today on QBO + modern tooling
Select and own tools across AP (e.g., BILL), corporate cards/expenses (e.g., Ramp/Brex), payroll/HRIS (e.g., Rippling/Gusto), equity (e.g., Carta), and close management.
Instrument finance KPIs (close time, on‑time invoicing, DSO, cash accuracy, error rates) and publish dashboards.
Cross‑functional & customer‑facing finance
Partner with Sales/Legal on deal review (pricing, billing terms, acceptance, renewals).
Support Customer Success on entitlement checks, usage→billing alignment, and AR escalations.
Contribute to security/commercial reviews (DPAs, vendor risk, SOC 2 evidence) for enterprise/utility customers.
People & org
Design the accounting org (Controller today; add AR/Billing Specialist and Staff/Senior Accountant as volume dictates).
Hire, onboard, and coach; set clear roles, growth paths, and segregation of duties.
Lead external partners: tax CPA, audit/review firm, and fractional support as needed.
Examples of near‑term problems you’ll tackle (first 90 days)
Close discipline: Implement a close calendar and deliver a ≤ 6‑day close with reconciliations and no post‑close surprises.
Invoicing rigor: Stand up billing schedules from live contracts; standardize invoice templates and portal SOPs; clear any backlog.
Revenue recognition: Author policies and sample memos for subscription + services bundles; establish JE patterns and controls.
Cash & collections: Launch a dunning cadence; improve DSO by 10+ days; institute weekly AR reviews and cash application SLAs.
Controls: Lock down approvals, role‑based access, and evidence capture that satisfies SOC 2/ISO 27001 without slowing delivery.
Reporting: Deliver a board‑ready monthly package with product/segment views and a 24‑month runway view.
Org & tools: Define when to add AR/Billing and Staff Accountant; recommend pragmatic tooling (now).
You’ll thrive here if you…
Have 6‑10+ years blending public accounting (Big 4/Top 10) and startup/SaaS or services experience.
Are a player‑coach who can both post entries and design processes, policies, and metrics.
Know ASC 606 cold and have owned order‑to‑cash in enterprise/public‑sector environments (including customer portals).
Care about correctness and controls: typed contracts, evidence, approvals, and audit‑ready workpapers.
Communicate crisply with founders, customers, and auditors; write clear memos; keep calm when the numbers move.
Nice To Have (not Required)
CPA (active or inactive), multi‑entity consolidations.
SOC 2 / ISO 27001 experience; familiarity with enterprise security questionnaires.
Sales/use tax at multi‑state scale; revenue for milestone/T&M; light M&A integration.
Exposure to nuclear/utility or other regulated, safety‑critical environments.
Success Metrics (what “good” looks like)
On‑time invoicing: ≥ 98%
Monthly close: ≤ 6 business days (target 5 as we mature)
DSO: at/under contract‑weighted target; steady improvement
Cash forecast (13 weeks): ±5–10% accuracy
Billing error rate:
Audit/review: clean results; no material adjustments
Compensation & Benefits
Base salary: $145k - $165k
Equity: 0.04% - 0.12%
Bonus: 10%
Benefits: Unlimited PTO, health/dental/vision insurance
Work model Full‑time, salaried. Hybrid at Phoenix HQ (≥80% in‑office; Wednesdays remote). Occasional travel to customer sites, auditors, or partners as needed.
How We Hire
20‑min CFO intro to trade context and mutual fit
Technical accounting deep dive (close, ASC 606, controls)
Team panel (ops/systems, collections, cross‑functional collaboration)
Final discussion on 90‑day plan, success metrics, and board‑level reporting
Ready to build the accounting foundation that keeps critical infrastructure running? We’d love to meet you.
Job specifics
Seniority level: Mid‑Senior level
Employment type: Full-time
Job function: Accounting/Auditing and Finance
Industries: Software Development
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The role & impact Reporting to the CFO (founder), you will lead a multi‑facet accounting organization spanning order‑to‑cash (including invoicing), procure‑to‑pay, payroll, monthly close, revenue recognition (ASC 606), audit/tax readiness, and controls that align with our SOC 2 / ISO 27001 posture. This is a working Controller role: you’ll write policies, post JEs, review contracts, close the books, and build the team and systems that make it all run on rails. You will partner cross‑functionally with Sales, Customer Success, Legal, Security, and Product to ensure contracts become correct invoices, revenue is recognized properly, and cash is predictable.
What You’ll Own
Accounting ops & reporting
Own GAAP and the monthly close; publish a close calendar and deliver a consistent ≤ 6‑business‑day close.
Produce a monthly management package (P&L with product/segment views, cash flow, variance notes, KPIs).
Build a rolling 24‑month cash forecast and drive forecast‑to‑actual accuracy.
Order‑to‑cash & invoicing (explicitly yours)
Translate executed MSAs/SOWs into billing schedules by SKU (subscriptions, milestones, T&M).
Issue invoices on time (including utility/public‑sector portals), with correct backup and approvals.
Own revenue recognition policies; draft memos and JE patterns for multi‑element arrangements.
Manage collections (DSO targets, dunning cadence, dispute resolution) and cash application.
Procure‑to‑pay & payroll
Implement AP workflows (vendor onboarding, 2/3‑way approvals where needed, card/expense policies).
Oversee payroll and multi‑state compliance; coordinate benefits and equity accounting with HR/People.
Maintain clean COA, fixed assets, and capitalization thresholds.
Controls, compliance & governance
Stand up a lightweight internal control framework aligned to SOC 2 / ISO 27001 (change control, access, backups, audit trails).
Coordinate tax (federal/state income, franchise, sales/use, 1099s, nexus monitoring) with external firms.
Prepare PBCs and evidence for audits, security questionnaires, and enterprise customer onboarding.
Systems & data
Run today on QBO + modern tooling
Select and own tools across AP (e.g., BILL), corporate cards/expenses (e.g., Ramp/Brex), payroll/HRIS (e.g., Rippling/Gusto), equity (e.g., Carta), and close management.
Instrument finance KPIs (close time, on‑time invoicing, DSO, cash accuracy, error rates) and publish dashboards.
Cross‑functional & customer‑facing finance
Partner with Sales/Legal on deal review (pricing, billing terms, acceptance, renewals).
Support Customer Success on entitlement checks, usage→billing alignment, and AR escalations.
Contribute to security/commercial reviews (DPAs, vendor risk, SOC 2 evidence) for enterprise/utility customers.
People & org
Design the accounting org (Controller today; add AR/Billing Specialist and Staff/Senior Accountant as volume dictates).
Hire, onboard, and coach; set clear roles, growth paths, and segregation of duties.
Lead external partners: tax CPA, audit/review firm, and fractional support as needed.
Examples of near‑term problems you’ll tackle (first 90 days)
Close discipline: Implement a close calendar and deliver a ≤ 6‑day close with reconciliations and no post‑close surprises.
Invoicing rigor: Stand up billing schedules from live contracts; standardize invoice templates and portal SOPs; clear any backlog.
Revenue recognition: Author policies and sample memos for subscription + services bundles; establish JE patterns and controls.
Cash & collections: Launch a dunning cadence; improve DSO by 10+ days; institute weekly AR reviews and cash application SLAs.
Controls: Lock down approvals, role‑based access, and evidence capture that satisfies SOC 2/ISO 27001 without slowing delivery.
Reporting: Deliver a board‑ready monthly package with product/segment views and a 24‑month runway view.
Org & tools: Define when to add AR/Billing and Staff Accountant; recommend pragmatic tooling (now).
You’ll thrive here if you…
Have 6‑10+ years blending public accounting (Big 4/Top 10) and startup/SaaS or services experience.
Are a player‑coach who can both post entries and design processes, policies, and metrics.
Know ASC 606 cold and have owned order‑to‑cash in enterprise/public‑sector environments (including customer portals).
Care about correctness and controls: typed contracts, evidence, approvals, and audit‑ready workpapers.
Communicate crisply with founders, customers, and auditors; write clear memos; keep calm when the numbers move.
Nice To Have (not Required)
CPA (active or inactive), multi‑entity consolidations.
SOC 2 / ISO 27001 experience; familiarity with enterprise security questionnaires.
Sales/use tax at multi‑state scale; revenue for milestone/T&M; light M&A integration.
Exposure to nuclear/utility or other regulated, safety‑critical environments.
Success Metrics (what “good” looks like)
On‑time invoicing: ≥ 98%
Monthly close: ≤ 6 business days (target 5 as we mature)
DSO: at/under contract‑weighted target; steady improvement
Cash forecast (13 weeks): ±5–10% accuracy
Billing error rate:
Audit/review: clean results; no material adjustments
Compensation & Benefits
Base salary: $145k - $165k
Equity: 0.04% - 0.12%
Bonus: 10%
Benefits: Unlimited PTO, health/dental/vision insurance
Work model Full‑time, salaried. Hybrid at Phoenix HQ (≥80% in‑office; Wednesdays remote). Occasional travel to customer sites, auditors, or partners as needed.
How We Hire
20‑min CFO intro to trade context and mutual fit
Technical accounting deep dive (close, ASC 606, controls)
Team panel (ops/systems, collections, cross‑functional collaboration)
Final discussion on 90‑day plan, success metrics, and board‑level reporting
Ready to build the accounting foundation that keeps critical infrastructure running? We’d love to meet you.
Job specifics
Seniority level: Mid‑Senior level
Employment type: Full-time
Job function: Accounting/Auditing and Finance
Industries: Software Development
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