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Senior Backend Engineer, AI Code Review (Remote Contract, US or Canada)
Three-month remote contract (20-40 hrs/week) for senior engineers to design rubrics and evaluation criteria for coding AI, review and label model output, and build data-generation and evaluation pipelines. Requires 5+ years in Python, TypeScript, Go, or JavaScript with 4 hours' overlap with US Pacific time; open to candidates in the US or Canada.
Senior Backend Engineer (Java) — Fintech, Hybrid, Stock Options
Lead/Senior Java engineer designing and building scalable backend systems for a fintech platform in Kraków (hybrid, in-office expectations): developing REST APIs and microservices with Java, Spring Boot, and PostgreSQL, with a focus on high-performance, secure infrastructure.
Senior Backend Engineer (Java) - Fintech Core Systems
ARQ, a fintech in Kraków, is hiring a Senior Backend Engineer (Java) for a hybrid role building and evolving scalable backend services that power its financial products worldwide, with greenfield work on core systems such as payments and treasury.
Senior Backend Engineer — Fintech (Java) with Stock Options
Senior backend engineer at a Kraków fintech building scalable Java services for its financial products. Day to day: designing REST APIs and Spring Boot microservices backed by Postgres, with TDD and CI/CD. Hybrid role requiring 3–4 days per week in the Kraków office; stock options offered.
Senior Java Backend Engineer - Microservices & JVM Tuning
Senior Java backend engineer in Warsaw designing, building, and maintaining high-performance core Java applications and microservices, with a focus on multithreading, memory management, and JVM tuning. Core stack: Spring Boot, REST/JMS/SOAP services, SQL databases, and Hibernate/JPA.
Senior .NET Developer – Backend/API, Hybrydowy Poznań
PKO Finat Sp. z o.o. in Poznań seeks a senior .NET developer to design and build backend applications to business and non-functional requirements, implement API services, and integrate systems using C#, ASP.NET Core, REST, Git, and Azure DevOps/CI-CD. Hybrid on-site model in Poznań with a B2B contract, plus Luxmed and MyBenefit benefits.
Senior Backend Software Developer
Senior backend developer at IBM Software in Markham who designs, codes, and unit-tests component-level backend solutions, contributes to automated CI/CD pipelines, and develops fixes for customer-reported problems in an Agile, collaborative environment.
Backend Developer Cloud Sr.
Senior backend developer who designs, builds and maintains microservices, RESTful APIs and cloud solutions using Java (Spring Boot/Quarkus) and/or .NET Core on Azure/AWS, optimizing Oracle/SQL Server and NoSQL data stores, in a hybrid role in Peru.
Senior Backend Engineer
Senior Backend Engineer at Frame Security, a funded cybersecurity startup in Tel Aviv building AI-driven security awareness training and attack simulations. Day to day: designing and building core backend systems from the ground up — scalable, high-scale infrastructure processing large security data streams — using Go, Python, C++ and cloud platforms.
Senior Back End Engineer
Senior backend developer at Ignition Advice, building and scaling a microservices, event-driven platform that serves tier-1 financial institutions across Australia, the UK, and Europe. The role emphasizes research and development and applying modern techniques and patterns.
Java Backend & API Integration Developer (Senior/Junior)
Agap2 is hiring a Java Backend & API Integration Developer (Senior and Junior) for an IT project in Ravenna, Italy. Day to day: building backend services, APIs and external integrations, handling persistence logic, analyzing anomalies and optimizing performance, with hybrid 3+2 onsite/remote work.
Senior Software Engineer - Backend (Java)
Senior backend Java engineer on PayPal's Payments Risk Engineering team in Chennai, building the real-time fraud detection and risk management services called on every PayPal money-movement transaction. Day to day: designing, developing, testing, and operating scalable Java microservices (Spring, REST APIs, JMS/JPA) with CI and code reviews.
Senior Software Engineer Backend/Infrastructure
Senior backend/infrastructure engineer (Go) in Lisbon at SimplicityDX, building real-time ingestion pipelines for creator UGC, human-verification tooling, and agent-facing distribution (MCP endpoints, commerce feeds) so AI shopping agents can query verified product evidence. Uses AWS, Docker/Kubernetes, SQL/NoSQL in an AI-native team.
Senior AI Agents Backend Engineer – Golang (APAC Remote)
Build and maintain Golang backend services, APIs, and AI-agent workflows at Binance that generate and deliver personalized market briefings and news updates, with focus on data pipelines, high-concurrency scheduled delivery, and monitoring AI workflow health and inference costs.
Senior AI Agents Backend Engineer - Golang, Remote-first
Senior backend engineer building Golang services, APIs, and AI-agent-driven market briefing content in a crypto context. Day to day involves designing architectures, data models, and agent workflows, owning high-concurrency low-latency services end-to-end, and collaborating with frontend, data, AI, DevOps, and QA teams.
Senior Java Backend Engineer for KYC Platform - Remote
Senior backend engineer joining Binance's KYC platform team, remote-first from Hong Kong: building high-throughput distributed Java services with Spring, MySQL and a NoSQL database, tuning performance, documenting clearly, mentoring juniors, and coordinating with global teams.