Contract Senior Software Engineer - WebGL (Color/Graphics)

Kunai seeks a Senior Software Engineer to join a digital payments modernization program integrating a major card network into a large U.S. financial institution. Responsibilities include designing domain/service architecture, building Spring Boot/JPA services, orchestrating integrations (Apache Camel), developing event-driven systems (Kafka), frontend micro-frontend work (Next.js/React/TypeScript), and owning OAuth2/OIDC identity flows. The role requires experience with PostgreSQL/Oracle, container platforms (OpenShift/Kubernetes), performance testing, CI/CD and test-driven practices. Minimum 5+ years professional software engineering experience. No sponsorship available.

Hands-on senior engineer embedded on a digital payments program to build and modernize Java/Spring Boot services, design integrations (Apache Camel), and implement event-driven systems (Kafka). Role covers frontend/identity (Next.js, OAuth2/Okta), cloud/platform governance (AWS IAM/S3/CloudFront), OpenShift container deployments, performance testing, DDD, and PCI-related data lifecycle work. Position is remote for the United States; visa sponsorship is not available.

Lead a lean engineering team as a hands-on Tech Lead building end-to-end TypeScript full-stack features: high-performance APIs, state-machine-driven backend systems, and user-facing web experiences (SvelteKit/React). Deploy LLM-powered features, custom agentic workflows, RAG pipelines, and build guardrails/traceability to measure LLM output reliability. Requires expert TypeScript, deep Node.js experience, daily use of AI coding assistants, strong testing and code-review discipline, and outstanding English communication. 100% remote.

Lead technical execution for a tech-powered real estate media company, writing production-grade TypeScript across backend and frontend. Build state-machine-driven backends, TypeScript APIs, and LLM-powered/agentic features (RAG pipelines, guardrails, traceability). Role is 100% remote, emphasizes advanced TypeScript, Node.js, SvelteKit/React familiarity, and strong English communication.

Lead and develop a highly scalable, geo-distributed database solution with focus on replication, sharding, concurrency, performance and high availability. Requires 4+ years Java experience, deep Java SE/JVM and concurrency knowledge, SQL and distributed-systems expertise. Role is remote (Georgia, Croatia, Estonia, Finland, Italy, Poland, Romania, Serbia, Spain, Armenia, Cyprus). Salary range €74,200–€100,400/year. MariaDB does not sponsor visas or relocation.

MariaDB is hiring a Senior Java Software Engineer to develop and test a scalable, geo-distributed database. The role involves designing and optimizing data storage and networking between nodes, implementing high-availability algorithms, profiling and tuning Java applications (tools like JFR, JMC, async-profiler, VisualVM), troubleshooting distributed environments, and leading other engineers. The position is remote across specified countries and requires 4+ years of Java experience and strong knowledge of SQL and distributed systems.

Kraken is hiring a Senior Software Engineer (React Native) for its Support Center team to develop in-product support, chat, content, banners, modals and voice-call capabilities across mobile and web. The role requires 5+ years of software development, strong JavaScript/TypeScript and React Native experience, familiarity with APIs and WebSockets, and the ability to own initiatives end-to-end while working cross-functionally with product, design and engineering teams.

Remote Python Engineer (PL) based in Brazil (Campinas). Role involves implementing solutions from coding to testing and production support, working on scalable performant systems, integrating RESTful APIs, and following agile processes. Key technologies: Python, Django, React, Pytest, Git/GitLab CI/CD, Docker; preferred: FastAPI/Flask, Celery, AsyncIO, ELK. Posted on 18-09-2026.

Capital One is hiring a Mobile Engineer (Mobile Engineer 4) to design and implement native mobile experiences (primarily Android/Kotlin), lead mobile architecture and reusable components, and mentor other engineers. The role includes building BFFs and Server-Driven UI, driving performance, accessibility, testing and staged rollout practices, and adopting AI-assisted development tools. Position is remote-eligible within the US and requires a minimum of 4 years of professional software engineering experience.

Capital One is hiring a Full-stack Engineer 4 to lead technology projects and contribute technical leadership on cloud-based, microservices-oriented full-stack systems for the Shopping team. Requires a bachelor’s degree, minimum 4 years of software engineering experience, and at least 2 years with public cloud platforms. Remote-eligible (US) and includes posted annual salary ranges; the employer will not sponsor new work authorization.