Top Backend Developer Jobs

Contract .NET backend developer to design, build, and maintain server-side systems. Work with C# (4.0+), ORM tools (Dapper/Entity Framework), SQL Server, Web Services and Web API. Role is likely onsite in Pittsburgh for a 3–6+ month engagement; local consultants preferred.

Build and operate distributed backend services and genomic reasoning engines that combine whole genome bioinformatics with AI. Design scalable data models, retrieval and vector search systems, and deterministic guardrails to ensure scientifically accurate, explainable genomic AI for production use.

Design, build, and maintain core backend services, APIs, and scalable data pipelines. Drive architecture for multi-tenant, strictly isolated SaaS systems, implement enterprise integrations, enforce backend standards, participate in reviews, and collaborate with AI/ML, infra, and frontend teams to deliver secure, production-grade infrastructure.

Develop and maintain Java backend services using Spring and microservices architecture. Require strong AWS expertise, troubleshooting skills, CI/CD experience; Kafka experience is a plus.

Design, develop, and maintain Java-based back-end applications, services, and APIs using Spring (Boot, Batch). Implement database schemas and complex Oracle SQL, build/consume RESTful services, manage dependencies with Maven, use Git, perform testing and debugging, and collaborate with cross-functional teams to deliver scalable enterprise solutions.

Senior full‑stack engineer responsible for building backend services (Node.js/TypeScript) and integrating with frontends (React/Vue). Ship production APIs, collaborate cross‑functionally, own delivery, mentor peers, and develop modular, testable, performant systems across diverse greenfield projects.

Founding engineering role to architect and build core backend platform components. Design and implement scalable, distributed Java/JVM systems, apply solid testing and CI/CD practices, collaborate with CEO/CTO, and work in an agile early-stage fintech startup environment.

Design, develop, and maintain backend software as part of an Agile DevOps team. Translate requirements into code, create design specs, data models, tests, and documentation. Support full software lifecycle, perform advanced SQL and data retrieval, work with big-data/distributed architectures, multiple OSs, and interact with internal/external teams. Provide direct support to intelligence community projects.

Build and maintain Python-based state systems for real-time voice AI, integrate multiple LLM providers, write async high-performance code and tests, monitor production, design databases (SQL/NoSQL), implement auth, and build microservices on AWS/Kubernetes to ensure reliability and high availability.

As a Senior Backend Engineer, you'll design, develop, and optimize scalable backend systems, lead architecture projects, and contribute to a growing engineering team at an early-stage startup.

As a Backend Software Engineer, you'll develop and maintain REST APIs using Django, manage cloud infrastructure, and oversee CI/CD pipelines to support consumer fintech applications.

As a Backend Engineer at Coral AI, you will design and build scalable backend systems, collaborate with teams, enforce best practices, and mentor engineers.

Lead engineering delivery for the Trade Manager Zone platform, overseeing software development, AI integration, and team management while ensuring high-performance and scalable systems.

Lead the Apps Development team for the Trade Manager Zone platform, focusing on high-performance settlement systems and integrating AI/ML capabilities.

Lead application systems analysis and programming activities, integrating functions to deploy products and process improvements while mentoring mid-level developers.

The Backend Software Engineer will develop backend solutions for a graphic design platform, mentor junior developers, and optimize performance.

Lead the design and architecture of scalable backend systems for a cloud-based SAAS platform, collaborate with cross-functional teams, and mentor junior engineers.

As a Senior Backend Engineer, you will build APIs and integrations, develop fault-tolerant systems, mentor engineers, and ensure code quality.

Architect and scale LlamaIndex's cloud platform, collaborating with engineering teams to create developer-friendly tools for context-aware applications.

Responsible for architecting and scaling the LlamaIndex cloud platform, delivering integrated developer experiences for context-aware applications.

As a Founding Backend Engineer, you will architect and scale LlamaIndex's cloud platform, ensuring a seamless developer experience while building scalable infrastructure and user-facing APIs.

The Founding Backend Engineer will architect and scale LlamaIndex's cloud platform, focusing on building scalable cloud services, containerized deployments, and user-facing APIs while collaborating with engineering teams.

The role involves building and shipping product features, collaborating with product and design teams, and improving development processes.

Build and maintain automated ETL/ELT data pipelines, improve data quality and monitoring, optimize Postgres and BigQuery schemas and queries, develop internal tooling, support data governance (HIPAA), participate in on-call rotation, and collaborate across engineering teams to scale data systems.

The Backend Engineer will implement new SDK and Indexer features, automate testing, support integration, and oversee production releases.