Backend Jobs in United States

Senior AI-First Backend Engineer

AI API AWS Data Science Python

Senior backend engineer at AdeptID building the core services behind talent matching — fast, reliable APIs and a low-latency serving layer for HR tech and staffing clients. Day to day: owning Python/AWS production services, optimizing latency and cost, and collaborating with Data Science on language models.

Goodfit

Open 15d HybridNorth America

Backend Engineer – Privacy Compliance & AI Platform

Backend developer on Utah Valley University's DataGov.AI project, building secure, scalable backend systems for privacy compliance reporting serving Utah government entities. Day to day: designing APIs, implementing data models, and deploying AWS cloud infrastructure with PII protection and auditability.

AI API AWS Cloud

FactSet Research Systems Inc.

Open 15d North AmericaLead

Lead Backend Engineer for OMS – Low-Latency Trading

FactSet is hiring a Lead Backend Engineer in New York to design, develop, and maintain a high-performance, low-latency Order Management System (OMS) for financial trading. Day to day: building scalable backend solutions, driving latency improvements, reviewing code, and mentoring engineers.

SmartRecruiters, Inc.

Backend Engineer - Real-Time Data, Hybrid + Equity

Open 15d North America

API Python SaaS SmartRecruiters

SmartRecruiters is hiring a Backend Software Engineer to design, build, and run Python services that process real-time outage data and communicate via APIs and message queues, owning features from design through production. The role is hybrid (three days onsite) in King of Prussia, PA, within a fast-growing SaaS environment, with equity offered.

Job Spread

Open 15d On-siteNorth AmericaFull-timeSenior

On-Site Senior Backend Engineer: Scalable APIs & Systems

Job Spread is hiring a full-time, on-site Senior Backend Software Engineer in Hagåtña, Guam to design, build, and maintain scalable backend services and APIs. Day-to-day work includes optimizing database queries, implementing security best practices, and code reviews while collaborating with frontend engineers and product managers.

General Atomics and Affiliated Companies

Senior Backend Engineer: Real-Time Intelligence Systems

Open 15d North AmericaContract

Senior Backend Engineer at GA-Intelligence building scalable, mission-critical backend services and distributed systems for global situational awareness and battle orchestration. Day to day: lead design and implementation, mentor engineers, and drive architecture with a focus on performance, reliability, and security in DoD/IC environments.

Backend Engineer

Cassandra Data Visualization DevOps Distributed Systems DynamoDB +6 skills

Senior backend/infrastructure engineer in San Francisco (primarily in-office) building fraud and risk detection infrastructure — real-time distributed systems that scale to billions of events and millions of users. Core stack: NoSQL big data (Cassandra/DynamoDB/BigTable), streaming (Kafka/Pub/Sub), plus vector databases and LLM-based systems.

130K – 210K $

Uber Technologies Inc.

Senior Backend Engineer — Deliverability Platform

API Microservices Observability

Senior Backend Engineer on Uber's Deliverability team building the real-time gating layer for Uber Eats transactions. Day to day: designing extensible APIs, scaling high-throughput, low-latency distributed microservices, and championing observability with metrics and dashboards.

Klarity

Senior AI Backend Engineer

AI Ai Enablement API Api Design Backbone.js +9 skills

Senior Backend + Applied AI Engineer at Within (Series B) building the backend services that power its multimodal enterprise AI agents — ingesting messy real-world data, orchestrating model/agent workflows with evals and guardrails, and enforcing enterprise-grade security at scale in San Francisco.

Senior Backend Engineer — Real-Time Payments & Fraud

Open 15d RemoteNorth AmericaSenior

Distributed Systems Fintech

Senior backend engineer on Lithic's Card Authorization team, owning real-time systems for fast, reliable card authorizations and building fraud/risk tooling customers use. Day-to-day work centers on distributed-systems challenges, delivered end-to-end at a fast-growing US fintech.

Moody

Senior AI-Driven Backend Engineer

AI API Api Design Cloud Cloud Native

Moody is hiring a Senior Software Engineer to design, build, and operate backend services powering AI-driven data products, owning features end-to-end from API design through deployment. The role centers on scalable cloud-native architectures, robust inference pipelines, and responsible AI practices.

luminarycloud

Open 15d North AmericaFull-time

Backend Engineer

AI API Authentication CI/CD Cloud +6 skills

Luminary Cloud, a Series B Physics AI simulation platform, is hiring a hands-on Backend Engineer lead in San Mateo, CA (onsite) to architect and scale backend systems and APIs on Kubernetes and GCP. The role blends backend development with SRE, security, and team mentoring, and requires 10+ years of distributed systems experience.

luminarycloud

Open 15d North AmericaLead

Senior Backend Engineer - Kubernetes & SaaS Lead

Cloud Distributed Systems Kubernetes SaaS

Senior backend lead based in San Mateo, CA who architects and scales Luminary's SaaS platform, guiding a team of backend and infrastructure engineers. Day-to-day work centers on distributed systems architecture, production Kubernetes, security, performance, and reliability of enterprise-grade cloud software.

Open 111d RemoteNorth America

Lead

Agile API Api Documentation AWS Azure +22 skills

Fully remote Back End Developer building and modernizing enterprise web applications for a Skybrid Solutions client. Day-to-day work centers on .NET Core APIs and microservices backed by MS SQL/Azure SQL, with Azure B2C (OAuth2/OIDC) security, CI/CD pipelines, and Agile Scrum delivery.