We are seeking a Senior Engineer (contractor) to support an exciting and complex new project. Senior Engineers are well-trusted members of the team that can resolve almost every single technical challenge they face without guidance. They deliver high-quality, scalable, and performant software solutions, taking ownership of the most complex parts of project development.

Collaborate closely with fellow engineers to architect and implement services required to back OneSignal’s product offerings. Help optimize a scaling strategy for our high performance Postgres and Scylla clusters. Design and optimize schemas, queries, indices, caches and more across Postgres and Scylla. Actively participate in peer code reviews and Technical Design Spec reviews, providing valuable technical insights to continuously improve our code base.

The Fullstory Mobile team builds intuitive, privacy-conscious native libraries that help app developers create better user experiences. As a Senior iOS Engineer, you’ll design solutions that give mobile teams deep, actionable insights into how users interact with their apps, without compromising performance or privacy. You will use advanced techniques to analyze iOS frameworks and third-party code, write cross-platform code in Rust, and work alongside specialists in our Go APIs.

Design, build and maintain new Ads products and infrastructure from the backend to frontend. Collaborate with both engineers on and off the team - from Revenue Infrastructure, to Core Tech, to Machine Learning, to Data Science. Be a strategic partner with engineering, product, and cross functional leadership in designing, developing and scaling digital advertising features.

Shape the future of AI with Rust! As an AI Tutor - Rust, you’ll use your systems programming expertise to improve AI-generated code and ensure it aligns with Rust’s safety and performance goals. Review Rust code for memory safety, correctness, and idiomatic style. Solve complex systems-level problems using Rust and explain your process. Identify and correct flaws in AI output or unclear logic. Summarize your approach and decision-making clearly and concisely.

Develop powerful, real-time, interactive applications using a variety of languages such as Laravel, React, Elixir, Rust, and Tailwind CSS. Collaborate with designers, engineers, and product teams to bring bold ideas to life. Work on cutting-edge collaboration tools. Building features that perform flawlessly under pressure —because our users depend on it.

SandboxAQ is seeking an experienced software engineer with a backend focus to help develop AQtive Guard, their suite of enterprise-grade cybersecurity tools. As Technical Lead of the third-party integrations team, you will design and implement features, perform research, develop tests, engage in code review, mentor developers, and interact with clients to understand their needs and gather feedback.

Passionate about writing innovative software? Join our world-class engineering team to deliver the future generations of our technology. You will work in cross-functional teams on cloud-based algorithmic pipelines for image and geometry processing (C++, Python, AWS) and interactive 3D graphical software (C++, Windows).

We are looking for an enthusiastic, self-motivated, Senior Backend Engineer to help us build the next generation of decentralised trading protocols. As a dedicated backend engineer, you will gain ownership of our existing backend services and influence the creation, design, and execution of future features and products. You will work on technically challenging aspects of our off-chain services and our developer-facing APIs and help ensure the delivery of reliable and performant features to improve CoW Protocol.

The Proofs team is looking for an experienced software engineer to develop the infrastructure that enables the secure and permissionless withdrawal of funds from OP Stack chains and the Superchain. You will be evolving our proof system to meet stage 2 requirements using dispute games and/or validity proofs, contributing to important Go-based and possibly Rust-based Ethereum and OP Stack infrastructure, and working with other teams and external developers and partners.