Backend Software Engineer (Mid-Level)

Dualentry; Warszawa; Remote; PLN 255,000 - 530,000; Full time

Job summary

A fast-growing AI startup is seeking a Backend Engineer to design and build core backend systems using Python. This role offers significant equity, autonomy, and a chance to shape the product directly in a remote-first environment. Ideal candidates have over 5 years of backend engineering experience, proficiency in Python, and a strong understanding of complex business logic. This opportunity includes a competitive salary, and the chance to grow with the company.

Benefits

Base Salary: $70K–$145K USD

Equity: ~$50K

15 PTO days + 12 public holidays

Remote-first team

High-autonomy work culture

Qualifications

• 5+ years of backend engineering experience.
• Proficient in Python and modern frameworks (FastAPI, Flask, Django).
• Strong experience with AWS or similar cloud services.
• Excellent database skills including PostgreSQL, SQL, ORMs.
• Experience with building robust APIs.

Responsibilities

• Design and build core backend systems using Python.
• Build APIs and infrastructure for business-critical logic.
• Launch production-ready features with CI/CD.
• Manage complex finance workflows and integrations.
• Collaborate with teams to design and ship systems.

Skills

Backend engineering

Python

Complex business-logic products

AWS

PostgreSQL

API development

CI/CD

Database design

Fluent English (C1+)

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 Backend Engineer, you’ll build and own critical features end-to-end, increasing product velocity and powering DualEntry’s AI-native ERP. 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.

Location: Remote - this role is available across all EU/LATAM countries with overlap for the US ET timezone (NYC HQ)

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.

Where you'll create impact

• Design and build core backend systems using Python

• Build APIs, services, and infrastructure handling real‑time, business‑critical accounting logic

• Launch production‑ready features from scratch, including CI/CD and deployment

• Turn complex finance workflows into performant, secure systems

• Manage complexity in a business‑logic‑heavy product, including migrations and scale

• Integrate third‑party tools and external systems while proactively managing risk

• Own work from architecture to testing, monitoring, and post‑release care

• Collaborate closely with founders, product, and frontend to co‑design systems and ship seamlessly

• Ship fast, make architectural calls, and deploy to prod daily

What sets you up for success

• 5+ years of backend engineering experience

• Deep experience with complex business‑logic products

• Proficient in Python and modern frameworks (FastAPI, Flask, Django)

• Strong AWS (or similar cloud) experience

• Excellent database skills: PostgreSQL, SQL, ORMs, migrations, schema design

• Experience building and testing robust APIs

• Solid understanding of CI/CD and production‑readiness

• Ability to manage complex systems with evolving requirements

• Fluent in English (C1+) with strong communication skills

• Pragmatic, curious, fast‑moving, and highly focused on execution

Why you’ll thrive here

• Significant equity ownership in one of the top AI companies in the world

• 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

Benefits

• Base Salary: $70K–$145K USD

• Equity: ~$50K

• Contract type: B2B

• Remote‑first team — the fastest team you will have ever worked with

• Time Off: 15 PTO days + 12 public holidays

• Early‑stage role with high autonomy and real long‑term upside

If you’re excited by fast‑pace building, ownership, and the chance to define the future of finance technology, we’d love to hear from you!

At DualEntry, we believe great products come from diverse teams. We’re an equal opportunity employer, and we’re committed to a culture where everyone feels included, supported, and able to do their best work.

• Work model webflow: On‑site
• Employment type webflow: Full‑time