Senior / Staff Backend Engineer

Marnoy Interests, Ltd.

United States

1 day ago

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Role details

Contract type

Permanent contract

Employment type

Part-time (≤ 32 hours)

Experience level

Expert

Experience required

5 years minimum

Working hours

Regular working hours

Job source

arc.dev

Tech stack

Java (Programming Language) .NET Framework Application Programming Interfaces (APIs) Databases Data Integrity PostgreSQL Node.Js PCI Data Security Standards Scrum Methodology Systems Architecture Systems Integration TypeScript

+13 more

Software Vulnerability Management WebSocket Data Logging Transaction Processing (Computing) Data Processing Real Time Systems Spring-boot Software Security Backend AI Platforms Graphql NestJS Golang

Requirements

5+ years designing, building, and scaling backend services powering gameplay, wallets, payments, promotions, and player account management using TypeScript + Node.js (Bonus: NestJS, Express).
Architect API first, microservice oriented systems that are modular, resilient, and independently deployable.
Build and maintain reliable REST/GraphQL APIs and third party integrations (payments, KYC/identity, fraud, analytics).
Own backend features end to end from design and implementation through production rollout and operational support
Comfort developing and scaling systems that may operate across on-prem and cloud environments.
Experience with transactional, audit-friendly systems is highly valued.
Implement secure, audit friendly transaction processing for deposits, withdrawals, bonuses, and settlement workflows.
Ensure consistency and traceability across high volume financial operations and asynchronous workflows.
Proven ability to design scalable, reliable systems.
Experience with transactions, integrations, and system architecture.
Solid database skills (especially PostgreSQL).
Security-first mindset with attention to data integrity and traceability.
Comfortable working autonomously in a startup environment.
Collaborate with AppSec and compliance partners to meet PCI DSS expectations around access control, data handling, logging, and vulnerability remediation.
Hands on experience using AI platforms to accelerate development and testing.
Experience working in Agile/Scrum environments.
Nice to have: FinTech, gaming, casino, payment, regulatory, WebSockets, or real-time systems experience.
Exclusions: Java, Spring Boot, Go, .NET.

Benefits & conditions

100% medical, dental & vision coverage (partial for dependents).
401(k) employer match.

About the company

OP is partnering with a fast-growing iGaming startup to hire talented individuals building the next generation of sweepstakes-based gaming experiences. Operating at the intersection of gaming, technology, and user engagement, the platform enables seamless cross-game interactions powered by innovative mechanics. With plans to rapidly scale this year, the team is seeking builders who thrive in fast-paced environments where ideas move from concept to live product in weeks.