---
title: 'Assistant Controller (D/F/M) at QphoX'
canonical: 'https://feeny.ai/job/assistant-controller-d-f-m-qphox-delft-south-holland-3pta6kwq3rdy'
type: 'job'
last_seen: '2026-09-10'
---

# Assistant Controller (D/F/M) at QphoX

- **Company:** QphoX
- **Location:** Delft South Holland, Netherlands
- **Posted:** 2026-05-26
- **Last confirmed live:** 2026-09-10
- **Apply:** https://job-boards.eu.greenhouse.io/qphox/jobs/4875175101

## Job description

QphoX is looking for an Assistant Controller to support the CFO in the day-to-day finance operations of a fast-growing technology company. The role combines financial administration, month-end closing, reporting support, payroll coordination, intercompany reconciliations and assistance with grant/subsidy reporting.

The Assistant Controller will work closely with the CFO, management team, external accountants, payroll providers and colleagues across the business to ensure that financial information is accurate, complete and on time.

This position is well suited to someone who is highly structured, detail-oriented and comfortable working in a scale-up environment. The successful candidate will be confident using accounting software (Exact Online), handling Dutch accounting processes, and supporting the professionalization of the finance function.

Key responsibilities:

- Process supplier invoices, customer invoices, expense claims and bank transactions in Exact Online, ensuring correct coding, VAT treatment and supporting documentation.
- Prepare supplier payment runs, monitor outstanding receivables, follow up on overdue customer invoices and maintain accurate AP/AR records.
- Support month-end close activities, including bank reconciliations, balance sheet reconciliations, accruals, deferred revenue/cost entries, inventory/COGS checks and intercompany reconciliations.
- Coordinate monthly payroll administration with the external payroll provider, including employee changes, expense reimbursements and payroll-related accounting entries.
- Assist with management reporting, year-end financial reporting, external accountant queries, subsidiary transactions and grant/subsidy reporting.

Skills and knowledge you will bring to QphoX:

- 2-5 years experience in Dutch financial administration, bookkeeping or assistant controller work, preferably in a growing company or international group.
- Strong working knowledge of accounting and expense software packages (preferably Exact Online).
- Good understanding of Dutch VAT, invoice requirements, expense processing and basic payroll administration.
- Ability to perform month-end reconciliations and understand balance sheet and profit-and-loss movements.
- Experience with accounts payable, accounts receivable, supplier payments and debtor follow-up.
- Strong spreadsheet (Excel or Google Sheets), online database, expense management and payroll software skills.
- Be accurate, proactive, discreet and well-organized, with the ability to manage deadlines and improve finance processes over time.
- The ideal candidate has completed or is working towards a relevant finance qualification.

Our Ideal Candidate:

The ideal candidate is hands-on, accurate and motivated by building reliable financial processes. They enjoy working with numbers, systems and people, and are comfortable moving between day-to-day financial administration and broader reporting tasks. They are proactive, responsible and eager to improve how finance operations are structured, documented and delivered.

They will be confident working independently, while also knowing when to ask questions and involve the CFO, accountants, payroll provider or other colleagues. Teamwork is an essential value of our company, hence fitting into the team is crucial. Finally, we have a positive and fast-paced learning environment.

We strongly encourage people of any underrepresented group to apply as we are committed to diversity and work to build an inclusive environment where all people, regardless of gender, race, religion, or background, can thrive.

Benefits and other perks of working with us:

- Competitive salary
- Employment stock ownership plan
- End-year performance-based bonus
- 25 days of holidays on a full-time basis
- Career growth opportunities
- Opportunities to network and connect

About us:

At QphoX we strive to be an inclusive place where a diverse mix of talented people want to come, to learn, to live their passion and do their best work.

We are dedicated to promoting equality, creating a safe environment for everyone, and believe deeply in diversity of race, gender, sexual orientation, religion, ethnicity, national origin, age, socioeconomic background and all the other fascinating characteristics that make us different. We truly think diversity is a strength and working in a diverse environment, and being exposed to a variety of perspectives makes us stronger as a team and better human beings.

## About QphoX

## Company Overview
- **One-liner**: QphoX develops quantum transduction technology to optically connect quantum computers, enabling scalable quantum networking.
- **Entity Type**: Private (Series A‑II, alive)
- **Headquarters**: Delft, Netherlands
- **Founded**: 2021
- **Founders**: Simon Groeblacher (CEO) and Robert Stockill (CTO)

## Core Business
- **Primary industry**: Quantum computing infrastructure (quantum networking, quantum transduction, photonics)
- **Target customers**: B2B – quantum computer manufacturers, research labs, defense and government agencies (e.g., AFRL, NQCC)
- **Mission / purpose**: “Bringing innovative networking solutions to tackle the most challenging scaling problems facing quantum computing.” [qphox.eu](https://qphox.eu/)

## Products & Services
- **QphoX Quantum Transducer**: A patented device that converts single microwave photons to single optical (telecom) photons, enabling quantum links between qubits without heat transfer. Type: Hardware (quantum component).
- **QphoX Optical Control System**: A full solution for delivering RF signals into extreme cryogenic environments via optical fibers, replacing traditional coaxial cables. Type: Hardware + system.
- **CryoSwitch Control Module**: A cryogenic microwave switch (designed for use with Radiall’s SP6T actuator) for routing signals at low temperatures. Type: Hardware.
- **White Paper – “Scalable Quantum Computing with Optical Links”**: Published in March 2025, outlining the company’s approach. Type: Educational resource. [qphox.eu](https://qphox.eu/)

## Market Standing
- **Valuation**: Not publicly disclosed
- **Key Metric**: Total funding raised – **$22.61M** (USD) as of latest round (Series A‑II, €10M from EIC STEP Scale‑Up in November 2025). [cbinsights.com](https://www.cbinsights.com/company/qphox)
- **Notable Investors / Partners**:
  - EIC STEP Scale‑Up (€10M)
  - Techleap, High‑Tech Gruenderfonds, Quantonation, Speedinvest, and 19+ other investors
  - Rigetti Computing (joint $5.8M AFRL contract)
  - UK National Quantum Computing Centre (NQCC)
  - Welinq, Sorbonne University (Project Meet‑Q)
  - European Quantum Pilot Line SUPREME (work package leader)
- **Growth Signals**:
  - Won $5.8M AFRL contract with Rigetti to enable optical networks of superconducting qubits (May 2025)
  - Launched breakthrough product for distributed quantum computing over long‑distance optical networks (January 2026)
  - Selected by European Innovation Council for €10M STEP Scale‑Up scheme (November 2025)
  - Leading work package in €50M European Quantum Pilot P4Q (starting 2026)
  - Team of 36 people from 21 nationalities, with 44% women [qphox.eu/team](https://qphox.eu/team/)

## Competitive Advantages
- **Patented quantum transduction technology** – the first viable interface between single microwave and single optical photons, solving the scaling bottleneck of quantum computers.
- **Optical control system** – replaces high‑thermal‑conductivity coaxial cables with low‑thermal‑conductivity optical fibers, preserving cryogenic environments.
- **Single‑photon interfaces** – leverage decades of progress in photonic, MEMS, and superconducting nanofabrication.
- **Strong government and industrial partnerships** (AFRL, NQCC, Rigetti, European Commission) validating the technology roadmap.

## Strategic Focus
- Scale quantum computing performance through optical networking and parallelization.
- Drive the development of the quantum internet by enabling distributed quantum computing over long distances.
- Commercialise the Quantum Transducer and Optical Control System for integration into existing quantum processors.
- Expand through European and US defence contracts (AFRL) and EU pilot lines.

## Why Work Here
- **Culture highlights**: Emphasises teamwork, diversity and inclusion, transparency, and self‑motivation. Hiring process includes a cultural fit call, technical presentation, and references. [job-boards.greenhouse.io/qphox](https://job-boards.greenhouse.io/qphox)
- **Work environment**: Office in Delft, Netherlands (Elektronicaweg 10). Likely on‑site, but hybrid/remote not explicitly stated.
- **Team**: Multidisciplinary mix of scientists, engineers, and technologists; 21 nationalities, 44% women.
- **Notable perks**: Work at the forefront of quantum technology, contribute to a scalable quantum future, and collaborate with leading institutions (Rigetti, NQCC, Sorbonne).
- **Open roles** (as of mid‑2026): Quantum Application Scientist/Engineer, Head of Product, Production Engineer, Nanofabrication Production Engineer, Personal Assistant, Assistant Controller. [job-boards.greenhouse.io/qphox](https://job-boards.greenhouse.io/qphox)

## Sources
1. [QphoX website](https://qphox.eu/)
2. [QphoX Careers page (Greenhouse)](https://job-boards.greenhouse.io/qphox)
3. [QphoX Team page](https://qphox.eu/team/)
4. [CB Insights QphoX profile](https://www.cbinsights.com/company/qphox)

## Other roles at QphoX

- [RF Electronics Engineer (D/F/M)](https://feeny.ai/job/rf-electronics-engineer-d-f-m-qphox-delft-south-holland-sje9z7sxjmk9) — Delft South Holland, Netherlands
- [Measurement Automation Scientist (D/F/M)](https://feeny.ai/job/measurement-automation-scientist-d-f-m-qphox-delft-south-holland-3nx41fzds4js) — Delft South Holland, Netherlands
- [Device Design Engineer (D/F/M)](https://feeny.ai/job/device-design-engineer-d-f-m-qphox-delft-south-holland-phhxxksxqr8z) — Delft South Holland, Netherlands
- [Production Technician (Electronics Assembly) (D/F/M)](https://feeny.ai/job/production-technician-electronics-assembly-d-f-m-qphox-delft-south-holland-ny6pjvqh38w9) — Delft South Holland, Netherlands
- [Open Application](https://feeny.ai/job/open-application-qphox-delft-south-holland-acwqpdv3rksn) — Delft South Holland, Netherlands