Senior Back-end Software Engineer

Hardcore work ethic and high agency 8+ years of experience in backend engineering Proven track record in high-growth, high-ownership environments 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 Bonus: expertise in Python and modern frameworks (FastAPI, Flask, or Django) Ability to manage complex systems with evolving requirements Fluent English (C1+) with clear communication 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 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. 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. You’ll architect features and systems end-to-end at an incredible pace. This is an opportunity to own critical infrastructure at the early stage of a category-defining AI company. Build the first, true AI accounting product with your own hands - alongside our elite team. 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 Base Salary: $100K–$165K USD Equity: ~$50K USD 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 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