Backend Software Engineer (Mid-Level)

Dualentry; Polska; Remote; PLN 254,000 - 528,000; Full time

Job summary

A fast-growing AI startup is seeking a Backend Engineer to design and build core backend systems. The role involves developing APIs and managing complex business logic with a focus on Python and AWS. This is a remote position with competitive compensation, including equity options and benefits. Join a dynamic team and help shape the future of finance through innovative technology.

Benefits

Equity options

15 PTO days + 12 public holidays

Visa sponsorship option

Qualifications

• 5+ years of experience in backend engineering.
• Deep experience with complex business logic products.
• Experience deploying on AWS or similar.
• Solid understanding of software lifecycle and production-readiness.
• Fluent in English (C1+) with strong communication skills.

Responsibilities

• Design and build core backend systems using Python.
• Build APIs and services handling complex accounting logic.
• Launch features including CI/CD pipelines.
• Integrate third-party tools and external systems.

Skills

Backend engineering

Python

AWS

PostgreSQL

API development

CI/CD

English

Tools

FastAPI

Flask

Django

Job description

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

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.

We’re growing our Engineering team and hiring our next Backend Engineer to increase our product velocity, own features end-to-end, and bring DualEntry’s AI-powered accounting platform to the world’s fastest-growing companies.

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.

Where You’ll Create Impact

• Design and build core backend systems using Python

• Build APIs, services, and infrastructure that handle real‑time, business‑critical, and complex accounting logic

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

• Work with product to turn complex finance workflows into performant, secure systems

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

• Integrate third‑party tools and external systems — proactively managing edge cases and risk

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

How You’ll Work

You’ll collaborate with:

• Founders, to understand core use cases and product priorities

• Product, to co‑design features from first principles

• Frontend Engineers, to ensure seamless delivery across the stack

You’ll work independently, make architectural calls, and deploy to production every day (!).

What Sets You Up for Success

• 5+ years of experience in backend engineering

• Deep experience with complex business logic products

• Proficient in Python and a modern web framework (FastAPI, Flask, or Django)

• Experience deploying on AWS (or similar cloud infrastructure)

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

• Experience building and testing robust APIs

• Solid understanding of software lifecycle, CI/CD, and production‑readiness

• Ability to manage complex systems with evolving requirements

• Fluent in English (C1+) with strong written and verbal communication

How You Operate

• Pragmatic: You like to move forward and make decisions based on reality (not theory). We don't debate if Cassandra has the most theoretical scalability — we use Postgres until it breaks

• Hard working: 'You can work long, hard, or smart, but [here] you can't choose two out of three" – Jeff Bezos. We wrote this job post during the weekend

• Curious: you love to learn, are highly curious about new frameworks and solutions to engineering problems

• Fast‑moving – You deploy daily, iterate quickly, and never wait for permission

Why You’ll Thrive Here

• You’ll help build the foundational backend of a product with massive market pull

• You’ll work with a high‑trust, high‑speed team that cares about clean code and clear ownership

• You’ll see your work go live weekly and shape how modern finance teams operate

• You’ll grow fast — with full visibility and real responsibility

Compensation & Benefits

• Base salary: $70K–$145K USD

• Equity: ~$50K+ USD

• B2B contract (regular employment contract available)

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

• 15 PTO days + 12 public holidays

• Visa sponsorship option for relocation to NYC within 2 years

• Freedom, autonomy, and impact from day one

If you're excited to build systems that power AI and build the first true accounting AI product with your own hands, we’d love to hear from you.