Top Backend Developer Jobs

Own and lead the technical direction of a major codebase section while designing, building, testing, documenting, and maintaining secure, scalable API-based decisioning products. Partner with product, engineering, and security teams on agile delivery, troubleshoot production issues, meet SLA requirements, and participate in an on-call rotation.

Build and operate backend systems powering Citizen’s real-time safety pipeline, live video, AI-assisted incident detection, enterprise APIs, and internal tools. Own services handling high-scale event processing, latency, correctness, observability, infrastructure cost, and production reliability. Use Go, Python, Kubernetes, and Google Cloud while extending agent-based development and operations workflows. Participate in 24/7 rotational on-call, drive initiatives, collaborate with mobile, ML, data, and operations teams, and work onsite in New York City.

Leads hands-on software engineering for Java microservices modernization, designing, coding, testing, and shipping production services. Owns APIs, service decomposition, data access, integrations, and technical decisions while improving engineering quality through reviews, pairing, and testing. Mentors engineers, manages a small team, communicates risks and tradeoffs, supports hiring, and contributes to architecture, solutioning, and proposal development.

Lead the architecture, development, testing, and maintenance of scalable backend systems and APIs. Drive technical decisions, code quality, performance optimization, documentation, continuous delivery, and monitoring. Collaborate with product, design, and engineering teams to translate requirements into reliable solutions. Mentor junior engineers, conduct code reviews, resolve complex technical issues, and contribute to agile development and overall technology strategy.

Lead architecture and hands-on development of backend and API platforms supporting ecommerce, loyalty, clienteling, and customer personalization. Build scalable Node.js and TypeScript services, integrations, microservices, and event-driven systems across commerce, payments, fulfillment, CRM, analytics, and digital experience platforms. Own API governance, security, observability, DevOps automation, and cloud infrastructure while mentoring engineers and shaping technical standards and roadmaps.

Build and improve Go backend services, GraphQL APIs, relational data models, background jobs, and third-party integrations. Write SQL, automated tests, and production fixes while improving reliability and performance through logs and metrics. Collaborate with product, design, mobile, and frontend engineers to ship collector-facing features. The role requires ownership, clear communication, fast learning, and comfort working in a small, rapidly changing startup environment.

Develop and maintain enterprise Java backend applications for a fraud risk platform. Build scalable microservices and REST APIs using Spring Boot, support AWS-hosted applications and services, optimize SQL queries, troubleshoot databases and production issues, support batch-processing workflows, perform root cause analysis, and collaborate with engineering, compliance, platform, and business teams in an Agile environment.

Build and support backend architecture for a streaming app, analytics engine, and prediction engine. Own services such as authentication, user profiles, loyalty, and in-app purchases; develop clean, tested code; maintain shared infrastructure; and resolve bugs and incidents. The role requires backend production experience, cloud and Docker proficiency, and familiarity with microservices, REST APIs, message queues, and potentially streaming or payment systems.

Lead the architecture, technical strategy, and implementation of Squarespace’s large-scale Communications Platform for email, push, and in-product notifications. Provide hands-on Java development, drive modernization and reliability improvements, mentor engineers, conduct design and code reviews, identify systemic risks, and influence cross-team architecture decisions while balancing delivery with long-term platform health.

Lead development of scalable backend systems, enterprise API integrations, data migrations, and cloud-native applications for a health technology platform. Build Python services using Flask and AWS serverless technologies, design PostgreSQL-backed systems, ensure security and observability, conduct code reviews, and provide technical leadership. Collaborate with product teams, clients, and stakeholders to gather requirements, make architectural decisions, and deliver complex integrations and software projects.

Build and enhance Judi Health’s scalable healthcare platform using Python, AWS, PostgreSQL, and infrastructure-as-code technologies. Lead features from design through delivery, collaborate with product, design, QA, and engineering teams, provide technical guidance, and serve as a subject matter expert. Work in an Agile/Scrum environment while writing quality code, unit tests, and supporting cross-functional stakeholders.

Leads the design, development, and operation of scalable backend systems using Golang, AWS, Kubernetes, and Terraform. Defines architecture and technical standards, drives large-scale technical initiatives, ensures reliability and performance, partners cross-functionally, and mentors engineers. The role also involves building distributed microservices, managing cloud-native deployments, and delivering production systems end to end. Experience with video workflows, video analytics, or LLM-powered applications is preferred.

Lead design, development, and integration of backend systems for a large-scale video streaming platform. Build Java-based APIs and microservices, manage data and recommendation pipelines, handle video ingestion and metadata workflows, deploy services on cloud and Kubernetes, ensure performance, reliability, and test automation, and collaborate with product and operations teams to deliver scalable streaming solutions.

Own backend architecture, code, deployments, monitoring, and on-call for AI shopping agents that perform live purchases. Build resilient checkout automation, scalable product ingestion infrastructure, embedding-based search and ranking, and systems that automatically detect and recover from failures. The role requires strong Python, end-to-end production ownership, and comfort with ambiguous, adversarial systems. Experience with AI agents, LLMs, machine learning, e-commerce, payments, or fraud infrastructure is preferred.

Designs, builds, deploys, and operates shared security services, libraries, middleware, and platform patterns in TypeScript. Responsibilities include identity and authentication, authorization, secrets and key management, encryption, audit logging, rate limiting, abuse prevention, monitoring, and reliability. The engineer will establish secure defaults and CI guardrails, partner with engineering teams, mentor engineers, and provide technical leadership while owning solutions end to end.

Own the integration layer connecting Spherecast with ERPs, FTP and S3 sources, data warehouses, and custom sheets. Build scalable, fault-tolerant, near-real-time pipelines handling large data volumes; orchestrate syncs; validate, normalize, and upsert data; and implement safe write paths for AI-approved ERP actions. Develop round-trip tests, monitoring, structured logging, alerting, auditability, and reusable connector architecture while working directly with customer operators and IT teams.

Build and operate backend services, third-party integrations, data-processing workflows, and ML/LLM systems for legal and medical data. Refactor monolithic services, optimize scalable infrastructure, troubleshoot production issues, apply security practices, mentor engineers, and collaborate with stakeholders and external technical partners. The role also involves API development, cloud infrastructure, document extraction, and evaluating AI system performance.

Design, build, and modernize high-scale, low-latency backend services and APIs for ad delivery. Work on distributed systems, performance, observability, cost efficiency, and architecture while collaborating with product, data, and engineering teams in a remote-first environment.

Build and maintain large-scale, highly available backend systems for financial products. Write and review tested code, collaborate cross-functionally, lead end-to-end technical execution, guide architectural decisions, drive strategic engineering initiatives, mentor junior engineers, and support system design, debugging, testing, releases, and operational monitoring.

Lead architecture and end-to-end delivery of large-scale backend systems. Design resilient, reliable, scalable services; write and review well-tested code; guide complex technical decisions; mentor engineers; and drive strategic initiatives across engineering teams. The role focuses on cloud architecture, distributed systems, performance, technical excellence, and building new systems for crypto and DeFi products.

Designs and implements scalable, high-performance backend services and customer-facing APIs using AWS. Responsibilities include AWS architecture, large-scale system design, third-party API integrations, mobile feature development, technology strategy, CI/CD, testing, and collaboration with product and engineering teams in an Agile/Scrum environment.

Lead architecture and hands-on development of ResortPass’s booking platform and versioned external APIs. Build reliable pricing, availability, holds, reservations, cancellations, integrations, and reconciliation workflows. Improve transactional correctness, concurrency, resilience, observability, and safe migration of the existing Rails system. Mentor backend engineers, guide technical decisions, and collaborate with Product, Partnerships, and hotel operations to launch new partners and experience categories.

Designs and maintains high-performance back-end services using Scala and Akka, CQRS, event-driven architecture, APIs, and database technologies. Develops containerized microservices with Docker and Kubernetes, implements data access layers, optimizes PostgreSQL and Cassandra queries, and writes unit and integration tests. Collaborates with architects, front-end developers, and product owners in an Agile environment using GitHub. The role supports public-facing federal regulatory applications and may involve asynchronous Python, front-end frameworks, open-source projects, and FISMA Moderate environments.

Build and own end-to-end frontend features for Ketryx's AI platform. Collaborate with designers, product, and customer teams to design accessible React/Next.js interfaces using Tailwind and shadcn, create and document a component library, refactor UIs, mentor teammates, and provide technical customer support. Contribute to backend and database work as needed.

Own the payments connector and adapter layer, enabling configurable provider integrations and migration to server-to-server and embedded flows. Build reliable transaction status handling through polling, idempotency, reconciliation, and observability. Define orchestration platform requirements for state machines, routing, cascading, and failure handling. Support card-program integrations, third-party provider relationships, and extending payment capabilities to acquired entities.