Senior Enterprise System Engineer

Senior Machine Learning Engineer, Ads Foundational Representations

Reddit

Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 126 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www.redditinc.com. Location: Reddit has a flexible first workforce. Don't live near our office? No worries: you can work remotely from anywhere in the UK or the Netherlands. The Ads Foundational Representations (AFR) team develops signals and representations of Reddit’s core entities (ads, posts, users, and so on), capturing the semantic, contextual, and behavioral information that Reddit Ads needs. We work on building embeddings to understand content and users' interests based on the content they engage with.  Our team has the potential to highlight one of Reddit's biggest differentiators: genuinely curated, high-quality, extremely relevant, and daily updated organic content. We are a Machine Learning/Data heavy team with a focus on the following areas: * Multimodal & Content Embeddings - Make sense of organic (posts, comments, subreddits) and promoted (ads, shopping products, their landing pages) text and media content by embedding them into a shared space.  * Contextual and Behavioral Relevance - Working with Product & Data Science, establishing definitions of what ads are relevant to users and the content we show them next to, building metrics and fine-tuning embeddings to better reflect relevance. * Knowledge Graph Embeddings - Building representations for the Knowledge graph entities, e.g., intellectual properties/brands, to be used for high-precision targeting & business insights.  * User Intent Modeling - Leveraging various techniques to introduce user representations based on the content they interact with: batch & real-time sequence modeling, LLM summarization, etc.  * LLM-based Representations - Leveraging LLMs, VLMs, and foundational models to build complex representations of Reddit entities that improve ranking outcomes The signals and features we create become a key piece in the Ads Delivery funnel, from targeting to the auction, as well as the Business Insights product and other advertiser-facing products such as Creative generation and optimization. As a Senior ML Engineer, you’ll be in charge of the full-cycle execution of ML projects - from collaborating with cross-functional teams on requirements and design, to the implementation of the feature and its experimentation. Responsibilities * Developing new or iterating on existing embedding models for advertising use cases, ranging from aggregation pipelines to two-tower architectures and sequence models.   * Working with local and 3rd-party LLMs/VLMs: extract representations, develop evaluation methodologies, prompt tune and fine-tune large models to build state-of-the-art embeddings.  * Building data processing and inference pipelines for the models we develop.  * Qualitative and quantitative evaluation of the various features we develop, end-to-end experimentation from internal benchmarks to downstream recommender system offline metrics to online experiments.  * Ensuring the reliability, scalability, and performance of the ML systems by writing automated tests, monitoring performance, and implementing best practices for model management. * Participating in modeling and coding reviews: You will review work by other team members and provide feedback to ensure that it meets the team's standards for quality and performance. * Collaborating with cross-functional teams to understand business requirements and translate them into technical solutions. Required Qualifications: * 5+ years of hands-on experience with the full lifecycle of designing, training, evaluating, testing, and deploying industry-level models. * Experience building NLP or CV models and integrating them at scale.  * Experience developing complex features/embeddings for downstream models.  * Experience with mainstream DL frameworks: PyTorch or TensorFlow. * Excitement about working with data and readiness to look behind the metric numbers.  Preferred Qualifications: * Experience with our stack (Python, Pytorch, Airflow, BigQuery, Ray, k8s, kafka, GCP) * Familiarity with the Ads domain and/or Search/Recommender systems is a strong plus. * Tech leadership experience: mentoring junior engineers and leading complex projects.  * Hands-on experience with using/fine-tuning/building LLMs. Benefits: * Global Benefit programs that fit your lifestyle, from workspace to professional development to caregiving support * Family Planning Support * Gender-Affirming Care * Mental Health & Coaching Benefits * Group Personal Pension Scheme with Employer match * Private Medical and Dental Scheme * Income Replacement Programs * Bike to Work scheme * Flexible Vacation & Paid Volunteer Time Off * Generous Paid Parental Leave In select roles and locations, the interviews will be recorded, transcribed and summarized by artificial intelligence (AI). You will have the opportunity to opt out of recording, transcription and summarization prior to any scheduled interviews. During the interview, we will collect the following categories of personal information: Identifiers, Professional and Employment-Related Information, Sensory Information (audio/video recording), and any other categories of personal information you choose to share with us. We will use this information to evaluate your application for employment or an independent contractor role, as applicable.  We will not sell your personal information or disclose it to any third party for their marketing purposes.  We will delete any recording of your interview promptly after making a hiring decision.  For more information about how we will handle your personal information, including our retention of it, please refer to our Candidate Privacy Policy for Potential Employees and Contractors. Reddit is proud to be an equal opportunity employer, and is committed to building a workforce representative of the diverse communities we serve.  Reddit is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If, due to a disability, you need an accommodation during the interview process, please let your recruiter know.

Senior SRE, Ads

Reddit

Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 126 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www.redditinc.com. Location: Reddit has a flexible first workforce. Don't live near our office? No worries: you can work remotely from anywhere in the UK, the Netherlands or Ireland. The Ads organization powers Reddit's advertising platform, enabling advertisers to reach highly engaged communities while helping Reddit grow its business. The reliability of our Ads systems directly impacts advertiser success, revenue generation, and user experience. The Ads Reliability team partners closely with Ads Engineering to improve reliability, scalability, operational excellence, and developer productivity across Reddit’s advertising ecosystem. We help build and operate highly available services that drive revenue and maintain advertiser trust. We’re looking for a Senior Site Reliability Engineer to build, operate, and scale the critical systems behind Reddit Ads. RESPONSIBILITIES: * Partner with Ads Engineering teams to improve reliability, scalability, and operational excellence of ad-serving, auction, targeting, measurement, and billing systems. * Design, build, and maintain infrastructure, tooling, and automation that improve service reliability and engineering productivity. * Improve observability through monitoring, alerting, tracing, logging, and dashboards. * Participate in on-call rotations and lead incident response efforts for critical production systems. * Run root cause analysis and drive corrective actions following incidents. * Collaborate with software engineers throughout the service lifecycle, from design reviews through production operations. * Drive adoption of SRE best practices including SLIs, SLOs, error budgets, capacity planning, and operational readiness reviews. * Reduce operational toil through automation and self-service tooling. * Help define and measure advertiser-critical user journeys such as campaign creation, ad delivery, reporting, and billing. * Scale Ads systems to support continued traffic growth, increased advertiser demand, and evolving business requirements. REQUIRED QUALIFICATIONS: * 5+ years of experience in Site Reliability Engineering, Infrastructure Engineering, or related roles operating large scale distributed systems. * Strong experience supporting high traffic, user facing production environments. * Good understanding of distributed systems, networking, Linux systems, cloud native architectures. * Good programming skills in languages such as Go, Python, or similar. * Demonstrated ability to troubleshoot complex issues across applications, infrastructure, networking, and services. * Experience with observability platforms, monitoring systems, alerting, and incident response. * Experience driving automation and operational improvements. Benefits: * Global Benefit programs that fit your lifestyle, from workspace to professional development to caregiving support * Family Planning Support * Gender-Affirming Care * Mental Health & Coaching Benefits * Group Personal Pension Scheme with Employer match * Private Medical and Dental Scheme * Income Replacement Programs * Bike to Work scheme * Flexible Vacation & Paid Volunteer Time Off * Generous Paid Parental Leave In select roles and locations, the interviews will be recorded, transcribed and summarized by artificial intelligence (AI). You will have the opportunity to opt out of recording, transcription and summarization prior to any scheduled interviews. During the interview, we will collect the following categories of personal information: Identifiers, Professional and Employment-Related Information, Sensory Information (audio/video recording), and any other categories of personal information you choose to share with us. We will use this information to evaluate your application for employment or an independent contractor role, as applicable.  We will not sell your personal information or disclose it to any third party for their marketing purposes.  We will delete any recording of your interview promptly after making a hiring decision.  For more information about how we will handle your personal information, including our retention of it, please refer to our Candidate Privacy Policy for Potential Employees and Contractors. Reddit is proud to be an equal opportunity employer, and is committed to building a workforce representative of the diverse communities we serve.  Reddit is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If, due to a disability, you need an accommodation during the interview process, please let your recruiter know.

Senior Engineering Manager V&V Media

Twilio

Who we are  At Twilio, we’re shaping the future of communications, all from the comfort of our homes. We deliver innovative solutions to hundreds of thousands of businesses and empower millions of developers worldwide to craft personalized customer experiences. Our dedication to remote-first work, and strong culture of connection and global inclusion means that no matter your location, you’re part of a vibrant team with diverse experiences making a global impact each day. As we continue to revolutionize how the world interacts, we’re acquiring new skills and experiences that make work feel truly rewarding. Your career at Twilio is in your hands. We use Artificial Intelligence (AI) to help make our hiring process efficient. That said, every hiring decision is made by real Twilions! . See yourself at Twilio Join the team as Twilio’s next Senior Engineering Manager,  Voice Media.  About the job We're looking for an experienced, technically strong Engineering Manager to lead our Voice Media team. You'll drive the technical strategy for core media infrastructure that powers Twilio's Voice services at global scale. Your team will build robust systems processing billions of media streams while maintaining industry-leading reliability, quality, and performance. This is a highly technical leadership role requiring deep systems expertise and a passion for real-time communications technology.       Responsibilities In this role, you’ll: * Lead a team of senior engineers developing Twilio's next-generation media processing stack                                                                          * Drive technical architecture decisions for low-latency, high-throughput media systems                                                                               * Collaborate with product, platform teams, and other engineering teams to define technical roadmaps * Establish engineering excellence through code quality standards, testing practices, and operational reliability * Mentor engineers and provide technical guidance on complex media processing challenges                                                                              * Balance technical debt reduction with feature development while maintaining service reliability                                                                     * Build and evolve systems handling real-time media processing at scale          * Own service performance metrics, reliability targets, and continuous improvement initiatives                                                                        * Partner with engineering leaders to align media platform capabilities with broader Voice strategy                                                                   * Make key technology stack decisions that impact Twilio's media processing capabilities      Qualifications  Twilio values diverse experiences from all kinds of industries, and we encourage everyone who meets the required qualifications to apply. If your career is just starting or hasn't followed a traditional path, don't let that stop you from considering Twilio. We are always looking for people who will bring something new to the table! Required: * 5+ years of engineering management experience leading teams building distributed systems      * Understanding of Voice/VoIP infrastructure and media handling challenges   * Strong technical background with experience architecting and building backend services at scale, operating them with high reliability under strict SLOs  * Deep understanding of systems design, microservice architecture, and cloud infrastructure     * Experience managing complex technical tradeoffs between reliability, scalability, and feature development  * Track record of successfully delivering critical infrastructure projects with significant technical complexity * Experience in improving developer velocity using AI tools * Strong knowledge of performance optimization, reliability engineering, and operational excellence * Excellent communication skills with ability to translate complex technical concepts across technical and non-technical audiences * Experience with at least one of: real-time communications systems, media processing, streaming technologies, or related fields    Desired: * Experience with SIP, RTP/RTCP or other communications protocols                                                                                             * Familiarity with media codecs, transcoding, packet loss concealment, and audio processing                                                                           * Background in building low-latency, globally distributed systems                                                                                                    * Experience with Rust, Java, C/C++, or other systems programming languages and platforms like Asterisk or gStreamer * Experience in building Voice AI products                                                                                       * Knowledge of cloud infrastructure on AWS or similar platforms                                                                                                       * Prior experience in telecommunications or communications platforms Location This role will be remote Ireland or UK. Travel  We prioritize connection and opportunities to build relationships with our customers and each other. For this role, you may be required to travel occasionally to participate in project or team in-person meetings. What We Offer Working at Twilio offers many benefits, including competitive pay, generous time off, ample parental and wellness leave, healthcare, a retirement savings program, and much more. Offerings vary by location. Twilio thinks big. Do you? We like to solve problems, take initiative, pitch in when needed, and are always up for trying new things. That's why we seek out colleagues who embody our values — something we call Twilio Magic. Additionally, we empower employees to build positive change in their communities by supporting their volunteering and donation efforts. So, if you're ready to unleash your full potential, do your best work, and be the best version of yourself, apply now! If this role isn't what you're looking for, please consider other open positions. Twilio is proud to be an equal opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, reproductive health decisions, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, political views or activity, or other applicable legally protected characteristics. We also consider qualified applicants with criminal histories, consistent with applicable federal, state and local law. Qualified applicants with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. Additionally, Twilio participates in the E-Verify program in certain locations, as required by law.