דרושים » תוכנה » Senior backend Developer - Real Time Optimization Team

We are a global marketing tech company, recognized as a Leader by Forrester and a Challenger by Gartner. We work with some of the world's most exciting brands, such as Sephora, Staples, and Entain, who love our thought-provoking combination of art and science. With a strong product, a proven business, and the DNA of a vibrant, fast-growing startup, we're on the cusp of our next growth spurt. It's the perfect time to join our team of ~500 thinkers and doers across NYC, LDN, TLV, and other locations, where 2 of every 3 managers were promoted from within. Growing your career with us is basically guaranteed.

Responsibilities
We are a team of technophiles who hate latency. As a member of our team, you will need to:
Develop and maintain systems that can process complex requests within a few milliseconds.
Tackle advanced engineering challenges in multiple languages and environments.
Own every product that the team manages, from ideation and planning, all the way to production and monitoring.
Teach and learn. We love to inspire and be inspired and make sure that each team member has their place to grow and excel.
Work both autonomously and collaboratively with the team and other teams.

As an AI Developer on our Optimization team, you will play a key role in advancing our core optimization capabilities by infusing them with cutting-edge artificial intelligence.

Our team is on a mission to significantly enhance our existing, high-performance optimization engine. You'll tackle a diverse range of complex problems - including optimization of vehicle routing and scheduling - for our customers at a massive scale.

You will join our team at a pivotal moment and be an integral part of building our next-generation AI/ML capabilities from the ground up. As a key contributor, your responsibilities will span the entire model lifecycle, from augmenting our current optimization models with advanced AI to implementing the infrastructure for their deployment and monitoring.

You will apply state-of-the-art techniques such as Deep Reinforcement Learning (DRL), predictive analytics, and Graph Neural Networks (GNNs), all while working with rich datasets including Geographic Information System (GIS) data.

Another core part of your role will be implementing best practices for safe AI/ML rollouts. You will help build and maintain robust A/B testing frameworks and canary deployment strategies, ensuring our innovations reach production safely and effectively.

In this highly collaborative position, you will work closely with other engineers and scientists, as well as cross-functional product teams in the US, to bring these intelligent services to life.

Responsibilities:

Develop, implement, and deploy state-of-the-art optimization models and machine learning algorithms to solve complex business problems like vehicle routing and resource scheduling.

Design and build robust, end-to-end MLOps pipelinesfrom data ingestion and feature engineering to model training, validation, and serving in a production environment.

Translate complex scientific concepts and research papers into production-quality code, primarily using Python and leveraging frameworks like PyTorch and optimization libraries.

Conduct rigorous offline and online experiments to validate model performance, ensuring that solutions are statistically sound, reliable, and deliver measurable business impact.

We are At Cross River, we're building the financial infrastructure that powers global innovation. With our cutting-edge suite of embedded payments, cards, and lending solutions, we enable millions of businesses and consumers to transact seamlessly and securely. With 900+ employees worldwide and an R&D center of over 160 employees in Jerusalem - we’re reshaping how financial technology is developed and delivered. .

The Role:
We are looking for a backend engineer who can design, build, and operate highly reliable Node.js services on AWS that enable generative?AI capabilities across our products and internal workflows. You will create scalable APIs, data pipelines, and serverless architectures that integrate large?language?model (LLM) services such as Amazon Bedrock, OpenAI, and open?source models, enabling teams to safely and efficiently leverage generative AI.

Who You Are:

* You have experience building Retrieval?Augmented Generation (RAG) systems or knowledge?base chatbots.
* You're Hands?on with vector databases such as Pinecone, Chroma, or pgvector on Postgres/Aurora.
* Have AWS certification (Developer, Solutions Architect, or Machine Learning Specialty).
* Experience with observability tooling (Datadog, New Relic) and cost?optimization strategies for AI workloads.
* Background in microservices, domain?driven design, or event?sourcing patterns.

What You’ll Actually Be Doing:

* Design and implement REST/GraphQL APIs in Node.js/TypeScript to serve generative?AI features such as chat, summarization, and content generation.
* Build and maintain AWS?native architectures using Lambda, API Gateway, ECS/Fargate, DynamoDB, S3, and Step Functions.
* Integrate and orchestrate LLM services (Amazon Bedrock, OpenAI, self?hosted models) and vector databases (Amazon Aurora pgvector, Pinecone, Chroma) to power Retrieval?Augmented Generation (RAG) pipelines.
* Create secure, observable, and cost?efficient infrastructure as code (CDK/Terraform) and automate CI/CD with GitHub Actions or AWS CodePipeline.
* Implement monitoring, tracing, and logging (CloudWatch, X?Ray, OpenTelemetry) to track latency, cost, and output quality of AI endpoints.
* Collaborate with ML engineers, product managers, and front?end teams in agile sprints; participate in design reviews and knowledge?sharing sessions.
* Establish best practices for prompt engineering, model evaluation, and data governance to ensure responsible AI usage.


Why You’ll Love Working Here:

* Flexible hybrid model: 3 days a week in the office – A must
* ₪1,000 net monthly wellness benefit – from therapy to Pilates to your kid’s art class
* Full Keren Hishtalmut, private health & dental insurance
* Donation matching, volunteering days, team outings, and mentorship programs
* A mission-driven culture that values ownership, trust, and meaningful impact


Next Step:
Hit Apply. Bring your AI vibes. We’ll bring the challenge - and the snacks.

we are looking for a promising and brilliant Cloud Back End Developer to join Avanan.
Avanan was acquired by our company and it is now our companys Email Security and collaboration solution.
This is a unique opportunity to work on a large-scale cloud-native system (one of the 10 largest in Israel!) using cutting-edge technology in an agile environment!
Key Responsibilities
As a Cloud Back-End Developer, you will be responsible for developing and maintaining exciting security products for Avanans customers. Our production environment is a fast-paced, agile development cloud environment - handling tens of millions of transactions daily
You will develop software serving large scale production real-time multi-tenant environment, handling large quantities of data, using microservices architecture and design patterns.
The domain you will tackle will involve cutting edge cybersecurity cloud solutions, like phishing, impersonation, anomaly detection, and more. All are implemented with the latest AWS tools and managed services such as Elastic Container Services, Kinesis, DynamoDB, SQS, Opensearch, ElasticCache, Iceberg, and many more. You will design and develop high impact real-time components and take ownership of the end-to-end solution.
Develop production-grade, large-scale cloud-based security products.
Design and develop data-driven applications in an agile development environment.
Collaborate cross-functionally with product managers, QA, automation, data engineers, and other engineers to achieve elegant solutions.
Work alongside other engineers on the team to elevate technology and consistently apply best practices.

Were looking for an experienced backend developer whos comfortable owning end-to-end features from data modeling to API development. Youll work closely with the team leader and take part in building smart, scalable systems that power everything from dashboards to AI-driven insights.

This is a hands-on role where youll write real code, influence product decisions, and work side-by-side with a sharp group of developers, data people, and product leads.

Your Day-to-Day Will Include
Building APIs and services using NestJS and TypeScript

Working with SQL and MongoDB to manage large-scale structured and semi-structured data

Writing efficient queries and optimizing backend performance

Using AI to solve real product and data problems this isnt about building tools for others; its core to what we do

Collaborating daily with colleagues in Israel and abroad (good English required)

Reporting directly to the team leader and having full ownership over your projects

We're looking for an experienced Backend Developer to join our growing data platform team.
As a Backend Developer, you'll work on a massive data processing pipeline, ingesting over a billion daily events from multiple sources. You'll also create the next-generation pipeline and help us scale from a billion events a day to tens of billions of events.
Responsibilities:
Own projects from initial discussions to release, including data exploration, architecture design, benchmarking new technologies, and product feedback.
Work with massive amounts of data from different sources using state-of-the-art technology to make big data accessible in real-time.
Develop and deploy real-time and batch data processing infrastructures.
Manage the development of distributed data pipelines and complex software designs to support high data rates (millions of daily active users) using cloud-based tools.
Work closely with company stakeholders on data-related issues.
Develop unit, integration, end-to-end (e2e), and load tests.

were looking for a talented Software Engineer to join the team. In this critical role, you will be developing our cloud-based personalized networking and security management solutions. The position involves developing end-to-end new products and features with a direct and observable impact on the customers. In addition, you will also be building microservices that work in near real-time environments.

Responsibilities:

Developing microservices that work in high scale and in near real-time performance
Developing web application using backend and full stack development
Scaling, deploying and monitoring microservices on global private cloud
Evaluating and integrating with 3rd party solutions
Leading the development through all its phases reviewing the spec, designing, implementing testing and monitoring.
Researching and embedding new technologies and best practices in the development team

As an Experienced Backend Engineer in the Audience Extension team in our Tel-Aviv Office, youll be instrumental in building and optimizing our core infrastructure for managing RTB requests at scale, one of the biggest revenue driven operations in the company.
How youll make an impact:
As an Experienced Backend Engineer, youll bring value by:
Develop one of the largest real time big data operation in the world to support over 40TB of new data every day
Have end to end ownership: Design, build, ship, measure and maintain our frontend and backend services
Collaborate with the brightest software engineers team members
Influence directly on the way billions of people discover the internet
Develop at unimaginable scale, serving hundreds of thousands of requests per second
Work on innovative projects that are the next growth engines for our company
Here are some of the things software developers in our group did in the last several months:
A unique data pipeline for managing RTB requests at scale
An algorithmic model to predict if a given Real-Time impression is valuable to our company
A smart gateway that ingests hundreds of thousands of requests per second for a single instance
An A/B tests system to explore variations and experiments
And many more.

We are looking for a talented Full Stack Developer to join our dynamic team As a key contributor, you will work in an agile environment to build optimize, and maintain scalable, high-quality SaaS applications. You will collaborate closely with designers, product managers, and other engineers to develop and enhance our products.
Responsibilities:
Develop and maintain high-quality, scalable web enterprise-ready SaaS applications using modern front-end and back-end technologies.
Stay up to date with the latest updates in React, Next.js and Node.js, continuously implementing best practices.
Work closely with UX/UI designers to create engaging and intuitive user experiences.
Optimize applications for maximum speed and scalability.
Utilize Next.js and Node.js as Backend-for-Frontend (BFF) architecture.
Write clean, reusable, and well-documented code.
Ensure best practices in software development, including code reviews and testing.
Work with DevOps to improve CI/CD pipelines, deployment and testing strategies.
Collaborate with the backend team and contribute to Python development as we expand our expertise.
Continuously explore and implement new technologies to enhance development efficiency.

We're looking for you, to develop the next generation of our leading security product.

Here we put our people first. We strongly believe in teamwork and encourage and trust our people to reach higher, learn more, and live up to their potential.

Java and GO Guru with coding hands-on ability
Set and meet the performances by KPIs
Establish a high scale multi-tenancy cloud foundation solution
Working with cutting-edge technologies in a dynamic environment, where you can learn and mentor your team members
Collaborate with Product Managers, Frontend and Backend Developers, and QA Engineers