Senior Backend Engineer, Payments

United States · Remotefull time

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Remote

senior

H1B: no

Hauler Hero Senior Backend Engineer to design and operate payment platform services including card processing, refunds, and reconciliation. Responsible for processor integrations and ensuring payment pipeline safety through idempotent charge paths and automated reconciliation.

Responsibilities

AI-First Backend Engineering
We are intentionally building an AI-assisted engineering organization. AI tools are part of the daily workflow, not optional.
What this means in practice:
Daily use of tools such as Claude, Claude Code, Cursor, and GitHub Copilot
AI-assisted implementation of Spring Boot services, APIs, database migrations, and business logic
AI-assisted test generation, refactoring suggestions, and code review support
AI-assisted log analysis, debugging, and issue investigation
You remain accountable for reviewing, validating, and owning everything AI produces. In payments, that bar is higher than anywhere else in the codebase. Speed matters, but a subtle bug moves real money, so correctness matters more.
This role is not a fit for engineers who are resistant to AI-assisted development or who rely on AI output without understanding the underlying system.
Payments Platform
Design, build, and operate the services behind card processing, refunds, and payment reconciliation
Own our processor integrations behind a common connector layer, including onboarding new processors and retiring old ones

Qualification

Core TechnologiesWorking knowledge of idempotencyExperience with financial edge casesIntegrations with payment processorsACH or bank-payment experienceGoogle Cloud PlatformBackground in fintechFrontend experience with ReactBackend

Required

5+ years building production backend systems
2+ years building or operating payment systems in production, including card processing, recurring billing, refunds and reversals, or reconciliation
Direct experience integrating with at least one payment processor or gateway API
Experience designing and operating systems with distributed data and meaningful scale
Experience working in Agile/Scrum environments, with strong Git/GitHub workflow experience
Core Technologies
Strong proficiency with Spring Boot (Java and/or Kotlin) and willingness to write Kotlin as your primary language
Deep experience with relational databases, especially PostgreSQL
Experience building and maintaining production APIs
Working knowledge of idempotency, at-least-once vs. exactly-once processing, retries, and reconciliation patterns for money movement
Understanding of PCI DSS scope and tokenization; you know what must never touch our servers
Experience with financial edge cases, including partial refunds, voids vs. reversals, chargebacks, declined and stuck transactions, and timezone-sensitive scheduling

Preferred

Integrations with payment processors
Ledger design or double-entry accounting concepts; invoicing and accounts-receivable systems
ACH or bank-payment experience
Event-driven architectures such as Pub/Sub or Kafka
Google Cloud Platform, including GKE, Cloud Run, and Cloud SQL, and Redis
Background in fintech, B2B SaaS, or logistics
Frontend experience with React
Backend: Kotlin, Java, Spring Boot, PostgreSQL

Benefits

Dental
Vision
PTO
Equity/RSU

Company

Hauler Hero

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Source: ashby

Active within the past hour

Remote-friendly

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Must-Have Skills for This Role

KotlinJavaSpring BootClaudeClaude CodeCursor

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