דרושים » פיתוח תוכנה » Staff Backend Software Engineer

ironSource, part of Unity, is a leading large-scale ad network at the forefront of advertising technology. We are looking for a highly skilled and experienced Senior Software Engineer to join our backend team.
In this role, you will leverage your expertise in distributed systems, data engineering, and software development to design, build, and deploy high-performance solutions. You will take a leading role in developing and maintaining a cutting-edge online machine learning system powered by PyTorch/Tensorflow models and Triton inference server.

This is an opportunity to work on complex, large-scale systems that serve billions of requests, shaping the future of ad tech and ML-driven optimization.

What you'll be doing
Architect and Build: Design, develop, and deploy robust, scalable, and high-performance distributed systems that form the backbone of ironSource's next-generation ML ad network.
Real-Time Ad Serving: Engineer and optimize critical systems for real-time ad serving, enabling machine learning models to make intelligent, low-latency decisions for optimal ad selection.
ML Infrastructure Innovation: Drive the evolution of our ML capabilities by researching, evaluating, and implementing cutting-edge techniques for feature stores, data aggregation, and model serving infrastructure.
Data Pipeline Engineering: Collaborate closely with data scientists and product managers to design, build, and maintain efficient and reliable data lakes and data pipelines, ensuring high-quality data for ML training and analytics.
Operational Excellence: Take ownership of key system components, ensuring their reliability, performance, and scalability in a production environment through proactive monitoring and continuous improvement.

Join our team working on an advanced ad-serving platform that powers millions of real-time interactions every second. As a Senior Backend Developer, youll play a key role in designing, developing, and maintaining a high-performance system that supports critical functionalities like targeting, attribution, budget management, and data pipelines for machine learning and reporting.Youll be expected to lead impactful projects, drive improvements in performance, scalability, and system reliability, and help shape solutions that directly influence the success of a globally recognized platform. We value bottom-up initiatives and encourage team members to bring their ideas to the table, fostering innovation and collaboration.
Why You'll Love This Role:

Take ownership of major projects and core features with significant business impact.
Work alongside skilled engineers in a fast-paced, high-scale environment.
Tackle challenging technical problems using cutting-edge tools like Kafka and Aerospike.
What you'll be doing
Design, develop, and monitor new features for the platform, including components supporting targeting, attribution, and budget management.
Maintain and optimize the performance of critical backend systems.
Refactor and improve legacy code to ensure scalability and efficiency.
Lead efforts to guarantee system reliability and low latency in a high-concurrency environment.
Collaborate with peers and across teams to deliver high-quality, production-ready solutions.

We are looking for a talented Senior Backend Developer to join our development team. As part of the team, you will contribute to building and enhancing high-scale, multi-tenant SaaS products that support customers worldwide. You will work in a hybrid environment, collaborating closely with highly skilled engineers in an agile, sprint-based methodology. This role is critical to the continued success of our next-generation security and monitoring platforms, ensuring performance, scalability, and reliability across multiple regions and tenants.

Key Responsibilities
Architect, design, and develop robust, high-quality backend services and APIs for our large-scale SaaS platform.

Own the end-to-end delivery of features in an agile, CI/CD environment, from conception to deployment.

Ensure the scalability, resilience, and high performance of our applications to support a rapidly growing, multi-tenant customer base across multiple regions.

Integrate with and optimize a diverse set of distributed data systems, including PostgreSQL, Redis, RabbitMQ, and Elasticsearch.

Champion and implement observability best practices (metrics, logging, tracing) using tools like Prometheus, Grafana, and OpenTelemetry to ensure system health and proactive monitoring.

Collaborate closely with product managers, frontend developers, and DevOps engineers to translate customer needs into impactful technical solutions.

Continuously explore, evaluate, and adopt new technologies to enhance our architecture and development efficiency.

Mentor and guide other developers, fostering a culture of technical excellence and knowledge sharing.

At Similarweb, we are revolutionizing the way businesses interact with the digital world by revealing to them everything that happens online.

Our unique data and solutions empower over 4,300 customers globally, including industry giants like Google, eBay, and Adidas, to make game-changing decisions that drive their digital strategies.

In 2021, we went public on the New York Stock Exchange, and we continue to reach new heights! Come work alongside Similarwebbers across the globe who are bright, curious, practical and good people.

What Youll Do:
Youll be part of the group responsible for Similarwebs main products. You will impact the work of developers in the group by designing, building and maintaining the core infrastructure of our solution and leading the research and development of new technologies as well as maintaining code standards and practices.

What does the day to day of Infrastructure Engineer at Similarweb look like:

You will be working on Similarwebs core B2B platform that serves tens of thousands of customers, serving hundreds of terabytes in production. Our backend engineers are responsible for the entire data lifecycle - from our endless datatlakes, through choosing the right serving methods and databases, all the way to our api services.

Your role will include:

Design and implement scalable backend services and libraries that are reusable and maintainable, serving as the foundation for various applications across the company.
Build and maintain tools that streamline development workflows, enabling product teams to focus on delivering business value.
Define and promote best practices for code quality, performance, and reliability, ensuring healthy production environments and rapid development cycles.
Lead the adoption and integration of AI tools to assist in code generation, testing, documentation, and debugging, thereby accelerating development processes.
Perform proof-of-concepts (POCs) on emerging technologies, including AI agents and platforms, to assess their applicability and benefits to our development ecosystem.
Drive cross-team technical projects aimed at improving infrastructure scalability, reliability, and developer experience.
Analyze and resolve complex production issues, ensuring minimal downtime and optimal performance.
Contribute to the evolution of our system architecture, ensuring it supports rapid development and scaling needs.

At Similarweb, we are revolutionizing the way businesses interact with the digital world by revealing to them everything that happens online.

Our unique data and solutions empower over 4,300 customers globally, including industry giants like Google, eBay, and Adidas, to make game-changing decisions that drive their digital strategies.

In 2021, we went public on the New York Stock Exchange, and we continue to reach new heights! Come work alongside Similarwebbers across the globe who are bright, curious, practical and good people.

What Youll Do:
Youll be part of the group responsible for Similarwebs main products. You will impact the work of developers in the group by designing, building and maintaining the core infrastructure of our solution and leading the research and development of new technologies as well as maintaining code standards and practices.

What does the day to day of Infrastructure Engineer at Similarweb look like:

You will be working on Similarwebs core B2B platform that serves tens of thousands of customers, serving hundreds of terabytes in production. Our backend engineers are responsible for the entire data lifecycle - from our endless datatlakes, through choosing the right serving methods and databases, all the way to our api services.

Your role will include:

Design and implement scalable backend services and libraries that are reusable and maintainable, serving as the foundation for various applications across the company.
Build and maintain tools that streamline development workflows, enabling product teams to focus on delivering business value.
Define and promote best practices for code quality, performance, and reliability, ensuring healthy production environments and rapid development cycles.
Lead the adoption and integration of AI tools to assist in code generation, testing, documentation, and debugging, thereby accelerating development processes.
Perform proof-of-concepts (POCs) on emerging technologies, including AI agents and platforms, to assess their applicability and benefits to our development ecosystem.
Drive cross-team technical projects aimed at improving infrastructure scalability, reliability, and developer experience.
Analyze and resolve complex production issues, ensuring minimal downtime and optimal performance.
Contribute to the evolution of our system architecture, ensuring it supports rapid development and scaling needs.

Were looking for an experienced Principal or Senior Backend Engineer to join our Harmony SaaS Security team a high-performing group born from a successful cybersecurity startup acquisition. We operate with startup agility and innovation, backed by the global strength of a world-class security leader.

Why Join Us
High-Trust, High-Talent Team: Work with smart, humble engineers who value collaboration and excellence
Startup Energy, Global Impact: Innovate quickly within a global cybersecurity organization
Meaningful Ownership: Shape the architecture and technical direction of a platform redefining how enterprises secure SaaS and GenAI
AI-Accelerated Development: We embrace tools like Cursor, Claude, and ChatGPT - while maintaining strong coding standards
Our tech stack includes Go, Kubernetes, Kafka, GCP, Postgres, Redis, BigQuery, Terraform, Temporal, Prometheus, OpenTelemetry, and more - delivering scalable, reliable systems that protect modern SaaS and GenAI ecosystems.
Key Responsibilities
Lead the technical design and direction of core platform components.
Mentor and guide developers, promoting a culture of excellence and collaboration.
Drive critical architectural initiatives and ensure best practices across the stack.
Build and optimize scalable, secure backend systems supporting enterprise-scale SaaS security.
If you love leading from the front - solving complex problems, mentoring engineers, and building scalable security solutions - wed love to meet you.

As a Backend Engineer, youll join a growing global team at Wix, shaping the future of eCommerce. Youll develop and maintain the core selling and order management capabilities for all Wix verticals.
Working in a highly distributed, cutting-edge environment, youll play a central role in building scalable, resilient systems that handle millions of requests per minute. In your day-to-day, you will:

Build and maintain backend systems to process 1.5 million API requests and 400,000 events per minute
Design, implement, and optimize scalable and resilient systems with an API-first approach
Solve high-scale technical challenges in a distributed microservices environment (~100 microservices)
Collaborate with cross-functional teams to ensure seamless integration and functionality across the platform
Lead technical initiatives to improve system performance, reliability, and scalability
Mentor and guide junior engineers to help them reach their full potential Strong communication skills in both Hebrew and English are required.


This position is primarily an in-person role, and candidates should be prepared to come to our Tel Aviv office 4 days a week, with 1 day working from home.

Like Google's own ambitions, the work of a Software Engineer goes beyond just Search. Software Engineering Managers have not only the technical expertise to take on and provide technical leadership to major projects, but also manage a team of Engineers. You not only optimize your own code but make sure Engineers are able to optimize theirs. As a Software Engineering Manager you manage your project goals, contribute to product strategy and help develop your team. Teams work all across the company, in areas such as information retrieval, artificial intelligence, natural language processing, distributed computing, large-scale system design, networking, security, data compression, user interface design; the list goes on and is growing every day. Operating with scale and speed, our exceptional software engineers are just getting started -- and as a manager, you guide the way.

With technical and leadership expertise, you manage engineers across multiple teams and locations, a large product budget and oversee the deployment of large-scale projects across multiple sites internationally.

Our mission is to provide the simplest, fastest, and most reliable path for enterprises to migrate their workloads to Google Cloud, accelerating their digital transformation journey. The team has adopted an AI-first approach, where product features and engineering productivity are centered around AI to increase delivery speed and open new opportunities for product journeys.

The AI and Infrastructure team is redefining whats possible. We empower Google customers with breakthrough capabilities and insights by delivering AI and Infrastructure at unparalleled scale, efficiency, reliability and velocity. Our customers include Googlers, Google Cloud customers, and billions of Google users worldwide.

We're the driving force behind Google's groundbreaking innovations, empowering the development of our cutting-edge AI models, delivering unparalleled computing power to global services, and providing the essential platforms that enable developers to build the future. From software to hardware our teams are shaping the future of world-leading hyperscale computing, with key teams working on the development of our TPUs, Vertex AI for Google Cloud, Google Global Networking, Data Center operations, systems research, and much more.

Responsibilities
Lead, mentor, and cultivate a high-performing engineering team. Foster a culture of innovation, psychological safety, and continuous career growth for every team member.
Oversee the team's execution and project life-cycle, ensuring the timely and efficient delivery of high-quality, scalable features in a changing, agile environment.
Advocate a customer-first culture by instilling the highest standards for service reliability, performance, and quality.
Drive our AI-first strategy's evolution from both a management perspective, inspiring the team and a technical one, guiding the practical integration of AI into both our product and our internal development processes.
Resolve technical problems inherent in a large-scale, enterprise-grade migrat

Youll join a high-impact team defining the future of mobile protection through cutting-edge research, smart engineering, and large-scale data-driven and AI based detection.

If youre ready to push boundaries, grow your expertise, and build technology that defines the standard for mobile cybersecurity, come lead with us.





Key Responsibilities
Join Check Points Mobile Detection Engines and Researchers team - the team that combines cybersecurity expertise and advanced development to protect Harmony Mobile clients, the market leader in mobile cybersecurity.

We design and build dynamic, static, AI based, and innovative detection engines that analyze and protect millions of clients worldwide across both Android and iOS.

If youre passionate about meaningful technology and want your ideas to directly impact millions of detection verdicts, join a team of experienced cybersecurity experts, developers, and researchers driven by excellence and innovation - a team that believes in learning from each other, giving every teammate the freedom to grow, make an impact, and help us push the boundaries of mobile detection even further.

What Youll Do-

Design, develop, and scale cloud-based systems that enable next-generation mobile detection capabilities.
Create POCs and evolve them into mature, production-ready systems that deliver real protection.
Work closely with malware researchers and data scientists to convert innovative ideas into effective detection logic.
Approach complex challenges with clear, simple, and practical solutions that drive impact.
Take ownership from design to delivery - writing efficient, maintainable code, performing design reviews, and mentoring teammates.
Build data-driven pipelines and automation frameworks that turn research insights into production-grade detections.

The Online Stores group is responsible for an eCommerce platform with hundreds of thousands of online stores, processing billions of dollars in yearly GPV. The team is at the heart of this ecosystem, driving innovation and building the next generation of online commerce experiences. We work on a platform that influences millions of users and generates billions in revenue.

If youre passionate about backend engineering and want to work on projects that make a difference, wed love to hear from you!