Contract Software Engineer - WebCompat Tooling (Dashboards and Reporting), Firefox

Contract Front End Engineer to implement approved UX designs for Firefox's screen, window, and tab sharing experience. Work involves building tested, accessible, and localizable browser UI, writing automated UI tests, collaborating with UX and QA, supporting partner testing with major web conferencing services, and landing changes in mozilla-central via public Phabricator reviews. Requires 4+ years of production UI experience with JavaScript/HTML/CSS and comfort working in open-source/public workflows.

Work with the Firefox DOM Core team to improve the health of the Session History area by writing Web-Platform Tests and Gecko mochitests, fixing failures, and iterating through code review with Gecko module owners. Required: substantial experience in browser-engine codebases or automation (ideally Firefox/Gecko), solid JavaScript for automated tests, proficiency in C++, and strong debugging skills. Preferred: prior contributions to Gecko or another browser engine and familiarity with web standards.

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 full‑stack Tech Lead building TypeScript APIs, state‑machine backend systems, and user‑facing web experiences. Requires expert TypeScript and Node.js skills, experience with LLM‑powered features and RAG pipelines, daily use of AI coding assistants, and strong English communication. Role is remote and aligned with PropTech/real estate media projects.

Senior, hands-on Tech Lead responsible for end-to-end feature delivery across a full-stack TypeScript ecosystem (Node.js backend, React/SvelteKit frontend). Work includes building state-machine-driven systems, custom RAG and agentic workflows, guardrails and measurement frameworks for LLM output reliability, and establishing testing and code-review discipline. Role is remote and requires advanced English.

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.