Senior Backend Engineer (NYC)

Outsiders Fund

New York (NY)

On-site

USD 200,000 - 330,000

Full time

14 days+

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Benefits offered by this job

Equity

Competitive salary

Medical insurance

Dental insurance

Vision insurance

One Medical

Mental health support

Fertility support

Virtual healthcare

401(k)

Commuter benefits

Learning budget

AI tokens

Visa sponsorship

Flexible PTO

Collaborative culture

Snacks & events

Job summary

DualEntry, building the OS for finance, is seeking a senior backend engineer with 5+ years of experience to own and scale real-time accounting systems. You will design APIs, work with PostgreSQL and AWS, and ship features end-to-end, including CI/CD, testing, and monitoring.

Python is preferred, with FastAPI/Flask/Django experience a plus. This role offers significant equity, a competitive salary, and a fast-moving, high-trust culture in the US.

Qualifications

5+ years in backend engineering (language agnostic).
Strong database skills: PostgreSQL, SQL, ORMs, migrations, schema design.
Experience deploying on AWS with CI/CD and production-readiness.

Responsibilities

Build backend systems and APIs (Python preferred).
Ship features end to end—architecture, CI/CD, testing, monitoring.
Integrate third-party tools and external systems, managing edge cases and risk.

Skills

Backend engineering

PostgreSQL

SQL

ORMs

AWS deployment

Python

Tools

CI/CD

Python frameworks

Job description

About DualEntry

DualEntry is building the OS for finance.

Every business needs a financial system of record, yet the world's largest fintech market ($220B+) still runs on software from the 1990s. DualEntry's AI-native ERP automates accounting from data entry to close, so finance teams move faster, spend less and incur less risk.

In just 2 years we've raised $100M+ from Lightspeed, Khosla Ventures, Contrary and Google Ventures and earned the trust of customers from $5M ARR to publicly traded companies.

We hire outliers - people who have achieved difficult things, in their careers or beyond. You'll find leaders, colleagues who've competed at the highest levels of sport, performed on Broadway, trained with UFC champions and founded the country’s largest Python community.

Where You'll Create Impact

Build!
Design backend systems and APIs (Python preferred) that run real-time, business-critical accounting logic
Ship features end to end - architecture, CI/CD, testing, monitoring, and beyond
Integrate third-party tools and external systems, proactively managing edge cases and risk

What Sets You Up for Success

Hardcore work ethic and high agency
5+ years in backend engineering (language agnostic)
Deep experience with complex business logic products
Strong database skills: PostgreSQL, SQL, ORMs, migrations, schema design
Experience deploying on AWS (or similar), with solid CI/CD and production-readiness fundamentals
Bonus: Python and a modern web framework (FastAPI, Flask, or Django)

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, high-trust environment with high expectations

Meet the Engineering Team

Marcin took a non-existent tax structure and built it end to end, setting the north star for how the team keeps improving it on top of it; modular and robust, always setting the bar for the rest.
Puhiza grew her team from one to full capacity, while owning our integration framework end to end; scaling it to support migrations, integrations, and bank connections. The queen of I/O on our platform.
Danylo took ownership of our bank connection engine end to end and rebuilt it from scratch over a weekend.

How You Operate

Pragmatic: you like to move forward and make decisions based in 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.
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

Benefits & Compensation