Join GitHub's distributed Traffic Team to design, implement, and operate scalable, reliable traffic and load-balancing systems (including the GitHub Load Balancer). Responsibilities include architecture and technical leadership, coding (primarily Go and Ruby), mentoring, participating in on-call rotation, and improving DDoS/abuse protection and routing/rate-limiting at global scale. Requires several years of production software experience and experience building/supporting high-traffic cloud-native systems.

The role is for a Senior Platform/Software Engineer on the WebExtensions team at Mozilla, responsible for implementing and maintaining WebExtensions APIs and Addon Management, debugging extension issues, contributing to Mozilla-owned extensions, and collaborating across product, QA, and AMO engineering. Requires 4+ years professional software development experience and strong JavaScript, DOM, HTML, and CSS skills; Firefox internals, C++/Rust, Android/GeckoView, and web security are listed as bonuses.

Wikimedia Foundation seeks two remote Software Engineer III (web full-stack) to join Core Experiences — App Growth or Editing teams — to build web-first product experiences, APIs, integrations and reusable components across mobile web and native app surfaces. Role requires at least a Bachelor's and 2 years' professional web application experience and experience with backend (PHP/Python) and/or frontend (JavaScript frameworks), responsive/mobile-first design, observability and testing.

Join GitHub's chat integrations team to design and build chat apps that integrate Copilot and AI features into Slack and Microsoft Teams. Responsibilities include building scalable web services, writing and reviewing code (JavaScript/React/TypeScript, Ruby/Rails, Go), authoring architecture proposals, and providing technical leadership and mentorship. The role is remote (United Kingdom) and lists 6+ years of software engineering experience as a required qualification.

CrowdStrike seeks an Automation Engineer II for the Falcon Complete MDR team to develop and maintain SOAR playbooks, PowerShell/Python scripts, and AI/LLM-integrated automation pipelines. The role requires ~2+ years of experience in automation, scripting, or cybersecurity and involves API integrations, SIEM query use, data parsing (JSON/regex), version control (Git), and workflow validation.

Fully remote Principal Engineer role hiring in the United Kingdom, Portugal, and Spain. Define and drive architecture of scalable, event-driven systems on AWS, lead design of core platform services, solve cross-cutting distributed-systems problems, partner with Data Engineering, and mentor senior engineers. Preferred 8+ years experience; strong Node.js/TypeScript, serverless AWS (Lambda, EventBridge, S3, API Gateway), IaC (CDK/Terraform), observability, and data modelling. Base salaries cited for Spain (€100,000) and Portugal (€80,000).

Join Wikimedia Foundation's App Growth team to design and implement web-first product experiences, RESTful APIs, and integrations that work across mobile web and native apps. Responsibilities include leading delivery of medium-complexity initiatives, frontend and backend implementation, observability, testing, cross-functional collaboration, prioritisation, and mentorship. Requires a bachelor's degree and 5+ years professional experience, strong JavaScript/TypeScript skills and frameworks (Vue.js or React), and experience with at least one backend language (e.g., PHP, Python, Java, Go). Position is fully remote with hiring available in a specified list of countries; US-based pay range provided.

Hands-on, customer-facing engineering role that leads deep technical discovery, architects and delivers reusable deployment patterns and accelerators (CI/CD, security, compliance, AI workflows), contributes code or design upstream when needed, and creates runbooks/reference architectures to scale adoption. Role may require up to 50% travel.

Full-time permanent remote role implementing scalable integrations for Veeva Vault using the Vault Java SDK and REST APIs. Responsibilities include Java-based extension development, cloud-based integration design, managing integration projects, and delivering technical consulting to life sciences customers. Requires 3+ years programming experience (Java or other OOP), a technical degree, experience with cloud architectures and REST APIs, strong communication and problem-solving skills; travel up to 10%.

Role to design, build, and maintain reporting and analytics features across Muck Rack’s platform. Requires 3+ years professional software development experience, strong Python and Django skills, frontend experience (preferably Vue.js), MySQL familiarity, RESTful API design, Git-based workflows, and willingness to participate in on-call rotations. Nice-to-haves include ClickHouse, Elasticsearch, Kafka, and Celery. Position is remote with priority for candidates in Bulgaria (UK and Ireland encouraged), up to 10% travel, and a stated Bulgaria salary range of €22,000–26,000+ annually.

Muck Rack seeks a Lead Software Engineer to design, build, and evolve distributed, event-driven ingestion pipelines that transform large volumes of unstructured content into structured, enriched data. The role requires partnering with Product, Search, Data Science, and Platform teams, mentoring engineers, and driving architectural decisions. Required: 8+ years' software engineering experience and proficiency with Python, streaming technologies (e.g., Kafka/Kinesis), microservices, gRPC/Protocol Buffers, and large-scale data systems.

Senior engineering role to design, implement, operate and scale GitHub's lexical and semantic code search (Blackbird) used across GitHub and Copilot products. Responsibilities include architecture, API design, performance and reliability, on-call incident response, mentoring, and integrating AI/ML-powered features. Qualifications list experience levels down to 3+ years depending on degree; strong experience in distributed systems, search at scale, reliability, and systems programming (Rust preferred) is highlighted.

Build and optimize inference stacks (vLLM), develop and tune GPU kernels, extend compiler/DSL infrastructure, define benchmarking (including MLPerf), and architect containerized large-scale inference deployments. Requires strong Python and C/C++ skills, GPU/CUDA experience, familiarity with PyTorch and inference engines, container/orchestration experience, and advanced performance engineering; typical experience expectations are 7+ years (BS) or 5+ years (MS).

CircleCI seeks a Software Engineer (remote, UK) with 3+ years production full-stack experience, backend-leaning and strong Go expertise. Role emphasizes AI-native engineering, CI/CD, system design, observability (Honeycomb, Datadog, Rollbar), and operating reliable distributed services. Salary range: £76,500–£95,000 GBP.

Remote Senior Software Engineer for Application Core Services focused on designing, building, operating, and evolving production backend services, APIs, and integrations (e.g., NetSuite, Salesforce) that support customer lifecycle workflows and internal business operations. Role involves full-stack contributions, ownership of services (including on-call), improving CI/CD and test coverage, and collaborating across distributed teams. Candidates considered in Germany, Ireland, Sweden, Spain, and the UK.

Olo is hiring a Senior Software Engineer to join the Merchant Solutions team within the Pay engineering group. The role requires 5+ years' software engineering experience, strong .NET/C# backend skills, ownership of complex features, CI/CD and testing expertise, and experience with distributed systems and cloud services (examples listed include AWS, MongoDB Atlas, Kubernetes/EKS). The position is fully remote within Northern Ireland (Belfast is referenced) and involves on-call duties, mentoring, code reviews, and contributions to payments-related functionality (card-present and card-not-present flows, reconciliation, payouts, merchant account management).

Chainguard seeks a Staff Software Engineer for the Customer Platform team to design, implement, and operate backend systems (deep production Go experience required) powering entitlements, policies, and customer onboarding. The role involves API and integration work, extending AI product experiences, cross-team coordination, and mentoring senior/mid-level engineers. Base salary range is $205,000–$231,000 USD per year.

Muck Rack seeks a Senior DevOps Engineer to design and standardize infrastructure, deployment workflows, and CI/CD pipelines; operate and improve Kubernetes-based container infrastructure on AWS; enhance observability and incident readiness; and participate in a shared on-call rotation. The role requires 5+ years in DevOps/platform engineering and hands-on production experience with Kubernetes, Terraform, AWS services (EKS, S3, IAM, RDS, VPC, Route53), CI/CD tooling, and container systems.

Join GitHub's Code Scanning organization to build and expand code analysis engines (CodeQL), maintain language support and queries, develop the QL query language and compiler, and work on LLM-integrations and evaluation. Role is remote and lists strong emphasis on static analysis, security, compilers, and machine-learning-for-code expertise.

Join the MediaWiki Platform team to design, improve, and maintain core MediaWiki components and shared platform capabilities (authentication, caching, rate limiting). The role emphasizes backend engineering, system design, observability, CI/CD, incident response, performance, scalability, and mentoring in a fully remote, distributed team.