Software Engineer (Senior)
Confirmed on the employer's own hiring board on Sep 23, 2026. First seen by Alion on Sep 14, 2026.
Our client, an early-stage AI startup, are hiring a Senior Software Engineer to join the team in New York. The successful candidate will own a critical part of the future accounting technology stack, working directly with customers to understand their challenges, design effective solutions and build systems that replace complex manual processes.
Responsibilities
Own the end-to-end development of a core finance domain and its supporting technology.
Design reliable AI agents that finance teams and auditors can understand and trust.
Develop verification, guardrail, monitoring and evaluation systems for nondeterministic AI.
Build financial context across transactions, ledgers, contracts, policies and historical decisions.
Integrate, standardize and reconcile data from ERPs, banks, payroll systems, billing platforms, CRMs and email.
Create durable and replay-safe workflows across complex stateful enterprise systems.
Develop secure and fully traceable write-back capabilities for financial systems.
Work directly with customers to understand finance processes and translate them into production software.
Contribute to technical decisions across LLM pipelines, infrastructure, backend systems and user experience.
Use AI coding agents to accelerate development and deliver high-quality production systems.
Skillset
At least 5 years of software engineering experience focused on backend development or infrastructure.
Strong programming experience with Python, Go, Java, Rust or another modern backend language.
The ability to quickly become productive within a Python-based environment.
Experience building complex backend systems including distributed pipelines, transactional platforms, ledger systems, integrations or workflow engines.
Previous experience working within an early-stage startup from pre-seed through Series B.
Ability to work directly with customers and translate operational challenges into scalable software.
Experience within fintech, accounting, payments, banking, treasury, audit, ERP or compliance technology.
Experience building production AI agents, evaluation frameworks, verification systems or AI observability platforms.
Knowledge of data warehouses, financial systems and enterprise integrations.
Strong system design, product judgment and problem-solving skills.
Benefits
Salary: $180k - $220k.
Early-stage equity.
Full medical, dental and vision coverage.
A 401(k) contribution match.