Backend Developer Jobs in United States

Senior backend developer and technical lead for Citigroup’s Applications Development team. Drives high‑quality, resilient software solutions with hands‑on Java, Mongo, Spring Boot, Kubernetes, and OpenShift.

Applications Development Technology Lead Analyst is a senior level individual contributor responsible for establishing and implementing new or revised application systems and programs, with a strong focus on hands‑on development and modern DevOps processes. This role requires deep technical expertise and leadership within the Technology team to drive high-quality, resilient, and efficiently delivered software solutions.

Backend Developer The Opportunity: As a back-end developer, you know that a good site or system needs the right combination of clean code, APIs, analytics, and infrastructure to develop a user-focused solution. We’re looking for a back-end developer with the software engineering skills it takes to help identify potential risks, contribute to solution development, and create efficient and effective systems for our clients.

BayRock Labs seeks a Backend Developer to build scalable backend services using Node.js and Java. The role involves designing RESTful APIs, integrating with SQL and NoSQL databases, and collaborating with front‑end and product teams.

We are seeking a Backend Developer to join our team and contribute to building robust backend services for our platform. In this role, you will work with Senior Backend Developers, Lead Architect, and other team members to implement reliable and efficient backend functionality that powers our applications.

Engineering Team at AI2CYBER builds secure backend platforms for advanced cybersecurity products. The Backend Developer designs and implements reliable Python services, scalable REST APIs, data ingestion pipelines, and database schemas while ensuring security and performance.

ChenMed seeks a Backend Developer to design, develop, and test robust software solutions in an Agile/Kanban environment. The role requires strong Java (8/21) and Spring Boot (2/3) expertise, along with experience in RESTful API design, GraphQL, and front‑end JavaScript/TypeScript frameworks such as React or Angular.

Design, develop, and maintain scalable backend services using Java and Spring Boot. Build data models for Cassandra DataStax, collaborate with cross‑functional teams, perform code reviews, optimize performance, troubleshoot production issues, and manage deployments on Linux with Maven.

Backend team at Bjak builds the core systems behind the AI Neobank app, enabling reliable APIs, workflows and financial product infrastructure at scale. The role designs, implements and maintains services for onboarding, payments, cards, transfers, rewards, travel, FX, KYC and risk, collaborating with product, frontend, mobile and AI teams.

Spatial Front, Inc. seeks a Backend Developer to design and build scalable, secure server‑side applications for Federal Government modernization programs. Responsibilities include developing APIs, managing relational and NoSQL databases, implementing microservices, collaborating with frontend and DevOps teams, conducting unit and integration testing, optimizing performance, and ensuring secure coding practices.

Geospatial Services Team builds backend platforms that power geospatial processing, automation, and user‑facing capabilities. The Backend Developer designs and implements APIs, integration services, and containerized tooling extending ArcGIS Enterprise, while maintaining geoprocessing workflows and data ingestion pipelines.

Calling all innovators – find your future at Fiserv. We’re Fiserv, a global leader in Fintech and payments, and we move money and information in a way that moves the world.

Photon Group Backend Team builds mission‑critical microservices for high‑volume data streams. The role designs and implements scalable Java/Spring Boot services, architecting event‑driven systems with Apache Kafka and deploying containers on AWS EKS. Based in the United States, the position requires on‑site presence with a flexible 9‑5 schedule.

Duetti seeks a seasoned Backend Developer to build and maintain scalable, secure systems that power data-driven music monetization. The role blends backend engineering with DevOps, focusing on cloud architecture, containerization, and automation to support data processing, API services, and infrastructure reliability.

Daylight is a decentralized electric utility startup focused on enabling homeowners to generate, store, and share energy. As a Senior Backend Developer, you will design and build Django‑based APIs that power the mobile app and partner integrations, ensuring high performance and reliability.

Humanity Protocol seeks a Backend Developer to design, implement, and maintain robust backend services that power its decentralized finance platform. The role involves building scalable APIs, optimizing database performance, and ensuring high availability and security.

Backend Developer at TransPerfect, a global language and technology solutions provider. The role focuses on designing, building, and maintaining server‑side applications that power client platforms and internal tools.

Backend Developer at Baanx will design, build, and maintain high‑performance services for digital asset platforms. The role focuses on Node.js microservices, PostgreSQL data stores, and integration with crypto custodians, exchanges, and other third‑party APIs.

Backend developer skilled in modern frameworks and cloud platforms, building scalable, secure systems for Booz Allen Hamilton clients.

PowerPay's Backend Software Developer works on scaling loan origination and servicing platforms within the fintech domain. The role designs, develops, and maintains APIs, database schemas, and middleware while collaborating with cross‑functional teams and product managers.