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Backend Software Engineer

DualEntry

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Location:
Poland, Warsaw

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Category:
IT - Software Development

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Contract Type:
B2B

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Salary:

100000.00 - 175000.00 USD / Year

Job Description:

Why This Role Matters Now: Since launching 18 months ago, we’ve raised $100M with backing from Lightspeed, Khosla, and Google Ventures. We got there by moving incredibly fast and hiring the best and brightest talent. To accelerate that momentum, we’re growing our team. Come and join us at one of NYC’s fastest-growing startups and have an impact on our product from day one. As our Senior/Staff Backend Engineer, you’ll design and build core systems end-to-end, architect real-time business-critical workflows, and ship production-ready features daily. This is an intense, hands-on role with full ownership. You’ll be joining at an early and defining moment. Your work will directly shape our product, customers, and trajectory. About DualEntry: Founded in 2024, DualEntry is one of NYC’s fastest-growing AI startups. DualEntry is changing the future of finance. Our AI-native ERP lets teams achieve more in less time. $5M-ARR businesses and NYSE-listed companies trust DualEntry to automate away busywork and fuel their growth with powerful reporting and insights. We’re making the one-person finance team a reality and putting the pain of legacy ERPs from the 1990s in the past. We operate with urgency and ownership. We move fast. Why you’ll thrive here: You’re joining early and will grow with DualEntry; Your feedback shapes the product directly; High-speed culture; High-trust environment with high expectations; Ambitious mission

Job Responsibility:

  • You’ll own end-to-end execution for backend systems and infrastructure
  • You’ll build APIs, services, and real-time systems handling complex accounting logic
  • You’ll collaborate with founders, product, and frontend engineering to turn complex workflows into secure, performant systems
  • You’ll design, implement, and ship production-ready features at high speed
  • You’ll manage data migrations, scaling challenges, external integrations, and end-to-end reliability
  • You’ll drive measurable outcomes that accelerate DualEntry’s product velocity and stability

Requirements:

  • 8+ years of experience in backend engineering
  • Proven track record in high-growth, high-ownership environments
  • Deep expertise in Python and modern frameworks (FastAPI, Flask, or Django)
  • Strong skills in PostgreSQL, SQL, ORMs, migrations, and schema design
  • Experience with AWS or comparable cloud infrastructure
  • Strong API design and testing experience
  • Understanding of CI/CD, deployment, and production readiness
  • Ability to manage complex systems with evolving requirements
  • Fluent English (C1+) with clear communication
What we offer:
  • Significant equity ownership in one of the top AI companies in the world
  • Equity: ~$50K USD
  • Remote-first team - the fastest team you will have ever worked with
  • Time Off: 15 PTO days + 12 public holidays
  • Visa sponsorship option for relocation to NYC within 2+ years
  • Early-stage role with high autonomy and real long-term upside

Additional Information:

Job Posted:
December 08, 2025

Employment Type:
Fulltime
Work Type:
Remote work
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