358,769 Senior-Level jobs
Senior engineering roles for experienced developers who lead delivery.
Senior Backend Engineer - AI & Real-Time Systems (Remote)
Back-end engineer on Superhuman's Mail team building and running production services for AI-driven workflows, calendar syncing, and real-time APIs used across desktop, web, and mobile. Core stack: Go, Postgres, Kubernetes, and AWS.
Senior Software Engineer
Senior backend engineer on Spotify's Authorization team in Toronto, building and operating the permissioning systems that let creators, teams, and partners securely manage their presence across Spotify (Music, Podcasts, Audiobooks). Core work: Java or similar backend services, distributed systems, and relational databases at scale, in a flexible hybrid setup.
Senior Backend Engineer - Go/C++ & Distributed Systems
Senior backend engineer at Cisco in Toronto owning edge-processing and real-time data pipeline services that handle petabytes of data across hybrid environments. Day-to-day centers on Go/C++ distributed systems work: designing, building, testing and deploying scalable services, plus system design leadership, code reviews, and on-call.
Senior Python Backend Engineer - FastAPI & Scalable APIs
Senior Python backend engineer building FastAPI-based RESTful APIs and microservices in Montréal, QC, focused on asynchronous programming and scalable backend design. Day-to-day involves API development, cross-team collaboration, and performance optimization in a hybrid onsite setting.
Senior Java developer
Senior Java developer building mission-critical VOIP/ROIP and digital communication applications for military and emergency services platforms, integrating audio codecs (Opus, AAC) and protocols like SIP/RTP/SRTP. On-site role based in the Ottawa area; 10+ years of Java experience required.
Senior Ruby Rails React Developer
Senior fullstack developer at RewardOps building the core Ruby on Rails and React SaaS application and integration engine in Toronto — shipping end-to-end features, APIs, background jobs, and client integrations, with unit testing, code reviews, performance work, and mentoring junior developers.
Senior Backend Engineer - Vibesec
Senior Backend Engineer on OX Security's VIBESEC team, building the backend for new AI security products in Node.js and TypeScript across cloud environments and endpoints. You own features end to end in a small, distributed senior team, shaping architecture in a fast-moving AI-security domain.
Sr. Analytics Engineer (X)
Build and maintain scalable data pipelines and quantitative models to power AI-driven decision-making using Python, SQL, and distributed systems like Spark.
Mechanical Test Engineer, Motors (Senior)
Senior engineer designing and running lab tests on electric motors, propulsion systems, and actuators to validate performance and reliability for drone delivery hardware.
Senior Security Researcher
Senior Security Researcher at Zenity (AI Agent Security) researching AI agent/LLM risks like prompt injection and jailbreaking, plus cloud, web, and API attack surfaces. Day to day involves designing detection logic for runtime protection, threat hunting across large datasets, and validating findings in production using Python, JavaScript, bash, and SQL-like queries.
Senior Java Engineer
Consultancy Ambush is hiring a hands-on senior backend engineer to build and modernize Java/Spring Boot microservices for clients: developing REST APIs, Kafka event-driven integrations, tested code, and production support on a distributed team. Requires 6+ years of Java experience, fluent English, and residency in Spain or Poland.
Supply Chain Planner
At Smiths Detection, we are looking for a driven and analytical Supply Chain Planner to support our manufacturing operations by ensuring the right materials are available at the right time to meet customer demand. This…
Sr. Web Engineer (X)
Builds and optimizes full-stack web features for a real-time social platform, using modern frontend and backend technologies to deliver high-performance, scalable user experiences.
Senior Back-End JavaScript Developer - IL
Builds and owns back-end services in Node.js, using MongoDB, Kubernetes and other modern infra to power a data platform.
Senior CNC Machinist - B Shift
ABOUT ROCKET LAB Rocket Lab is the end-to-end space company building rockets, spacecraft, and critical subsystems that keep the world connected, protected, expand humanity’s reach to the Moon, Mars, and beyond. We move…