8,456 Senior Backend jobs
Senior backend engineering roles owning server-side systems and APIs.
Senior Software Engineer, Backend (International)
At Affirm, we exist for the moments that matter—giving people a clear, predictable way to pay over time, with no hidden fees, no surprises, and no tradeoffs on what matters most. At Affirm, we exist for the moments…
Senior Backend Developer
MAJORITY is a groundbreaking all-in-one digital financial service app that includes an FDIC-insured account, Visa® Prepaid card, money remittance, and international calling. We are built for migrants, by…
Senior Backend Engineer – Kotlin Fintech, Scalable Systems
Senior backend engineer at London fintech Apron, scaling core products like Bill Pay and Apron Card. Day to day: building fast, reliable financial systems in Kotlin on the JVM with PostgreSQL and cloud infrastructure, collaborating with frontend, product, and design to ship features from discovery to production. Hybrid work in London with stock options.
Senior Back-End Engineer
We power people’s progress. At Preply, we’re all about creating life-changing learning experiences. We help people discover the magic of the perfect tutor, craft a personalised learning journey, and stay motivated to…
Senior Backend Engineer (all genders)
About Babbel Labs Babbel Labs is building the future of language learning. We are an AI-first, independent company within the Babbel group, based in Berlin. Our teams bring AI, research and product together to ship…
Senior AI Backend Developer
Senior AI Backend Developer at KVB Trading, a Hong Kong-based international financial services group. The role designs and deploys agentic LLM workflows (Python, LangChain, LangGraph) and builds Java microservices with RESTful/gRPC APIs that integrate AI engines with enterprise financial systems, plus data pipelines, evaluation frameworks, and production monitoring.
Senior Java Backend Engineer - Banking, Hybrid Warsaw
Senior Java backend developer building banking applications for a Devire client in Warsaw, supporting structured finance, liquidity calculations and regulatory reporting. Core stack: Java, Spring/Spring Boot, Jenkins, Maven. Hybrid role (3 days/week on-site), B2B contract.
Senior .NET Developer - Backend & API (Hybrid)
Integral Solutions seeks a senior .NET developer to design and build .NET applications, create API services, and refine business logic in a hybrid role in Poland. Core stack: C#, ASP.NET Core, and REST APIs, working with Visual Studio, Git, and Azure DevOps on a B2B contract with benefits.
Senior Backend Developer
MAJORITY is a groundbreaking all-in-one digital financial service app that includes an FDIC-insured account, Visa® Prepaid card, money remittance, and international calling. We are built for migrants, by migrants.…
Senior Backend Developer (Python)
Senior backend developer building and scaling high-traffic Python web platforms and REST APIs using Django/Flask/FastAPI, deployed on Linux with Nginx, Docker, AWS/Alibaba Cloud, CDN and caching, and MySQL/PostgreSQL/Redis. Also supports video streaming / media-related platform infrastructure and troubleshoots production issues.
(Senior) QA Engineer - Backend (x/f/m)
Senior QA Engineer at DKB (a German bank, hired via its tech sister Code Factory) in Berlin, designing and maintaining automated backend tests for APIs and microservices, integrating them into CI/CD pipelines, and shaping test strategy. Core stack: Java, Serenity BDD, Apache Kafka, CI/CD.
Senior Software Engineer (Backend), Co-Experience
Senior backend engineer on Roblox's Co-Experience team, owning and scaling the platform-level Party System (groups, chat, private gameplay, creator APIs) that keeps social interactions safe and civil for millions of concurrent users. Core tech: microservices in a compiled language (C#, C++, Java, or Go) and consumer-facing APIs, with heavy use of AI-assisted development.
Senior Backend Developer, AI Systems
Senior backend developer who leads the evolution of a large-scale AI-powered recommendation engine into a modern distributed architecture, powering billions of real-time marketing decisions. Day to day: designing and operating fault-tolerant Python services, tuning performance, and owning deployment and monitoring with Spark, Kubernetes, Kafka, gRPC, and cloud platforms.
Senior Backend Software Engineer, Node.js / TypeScript / Rust (Remote US, Full-time) — Mercor via AI Gig Scout
Mercor is placing a senior backend engineer on a high-scale consumer platform team at a large US enterprise, building services behind web and mobile apps used by millions. Daily work spans Node.js, TypeScript, and Rust, REST/GraphQL APIs, CI/CD, performance monitoring, and AI/ML integrations; fully remote US, $50–80/hr W-2.
Senior Backend Engineer
Senior Backend Engineer at Fullpath developing AI-driven products in the automotive space. Responsibilities include writing high-quality code, optimizing application performance, and collaborating with cross-functional teams using technologies like AI, SQL databases, AWS, and microservices.
Senior Software Engineer (Backend) (Remote)
Build scalable backend microservices and APIs for a construction commerce FinTech platform using Go/Java/Scala on AWS, with experience in distributed systems, Kafka/Kinesis, and SQL databases.
Senior Backend Engineer - Introducer Tech
Senior Backend Engineer - Introducer Tech - DE Hybrid in London / Remote within the UK We’re looking for a Senior Backend Engineer You'll own the Lending API in Germany, which banks, fintechs, brokers, and comparison…
Sr. Software Engineer (Backend)
Senior backend engineer at telehealth company Hims & Hers who designs and builds scalable backend services powering patient and provider experiences, mentors other engineers, and drives platform architecture. Core stack includes microservices on AWS and Kubernetes with PostgreSQL and CI/CD.