Backend Software Engineer Senior/Staff

DualEntry; Remote; PLN 399,000 - 636,000; Full time

Job summary

A growing AI-native ERP startup is seeking a Senior Backend Software Engineer to design and build core backend systems. The ideal candidate will have over 5 years of experience in backend engineering, proficiency in Python, and a deep understanding of complex business-logic products. You will launch production-ready features and integrate third-party tools in a high-speed, high-trust culture. This position offers significant equity ownership and a competitive salary range of $110K to $175K with benefits including 15 PTO days and a remote-first work model.

Benefits

Significant equity ownership

15 PTO days + 12 public holidays

Visa sponsorship option for relocation

Qualifications

• 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 including PostgreSQL, SQL, ORMs.

Responsibilities

• Design and build core backend systems using Python.
• Build APIs and infrastructure handling complex accounting logic.
• Launch production-ready features from scratch.

Skills

Backend engineering experience

Knowledge of Python

API development

Database skills (PostgreSQL)

Cloud infrastructure experience (AWS)

Job description

Backend Software Engineer (Senior/Staff) @ DualEntry

Poznań, Greater Poland Voivodeship, Polska

We are a remote‑first, fast‑moving AI‑native ERP startup founded in 2024, based in NYC, building the first true accounting AI product.

Why This Role Matters Now

Since launching 18 months ago, we’ve raised $100M from Lightspeed, Khosla, and Google Ventures. To accelerate momentum, we’re growing our team and need a senior engineer to own critical infrastructure from day one.

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 translate 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 while proactively managing edge cases and risk
• Own your work from architecture to testing, monitoring, and post‑release care

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: Move forward and make decisions based on reality, using tools that work until they break.
• Hard‑working: Work long, hard, or smart – you put in the effort.
• Curious: Love to learn and explore new frameworks and solutions.
• Fast‑moving: Deploy daily, iterate quickly, and never wait for permission.

Why You’ll Thrive Here

• Significant equity ownership in a top AI company
• Early‑stage growth and direct product influence
• High‑speed, high‑trust culture with high expectations
• Ambitious mission to transform finance

Compensation & Benefits

• Base salary: $110K–$175K USD
• Equity: ~$50K+ USD
• B2B contract (regular employment contract available)
• Remote‑first team – world‑wide collaboration
• 15 PTO days + 12 public holidays
• Visa sponsorship option for relocation to NYC within 2 years
• Freedom, autonomy, and impact from day one

We’re looking for someone who thrives in a high‑velocity environment and has proven experience building complex backend systems. If you’re excited to build the future of finance and help power AI, we’d love to hear from you.