Senior .NET Backend Engineer: Real-Time Security

A cloud technology company in Warsaw is looking for an experienced Senior Backend Engineer specializing in Python (FastAPI) or Go (Gin). The ideal candidate should have at least 5 years of commercial experience, especially in building scalable backend systems on AWS. You will design and develop APIs while working closely with AI and product teams to enhance...

Telnyx is seeking a Senior Backend Engineer to join our WebRTC squad and evolve the backend services behind our real‑time communications platform. You’ll own authentication, token management, and diagnostic logging while improving reliability at scale.You will work on distributed systems, deployment processes, and observability, shaping the architecture...

A global marketing technology firm in Warsaw is seeking a Senior Software Engineer to design and optimize high-performance backend systems for real-time bidding and machine learning. Candidates should have strong programming skills, experience in developing complex IT systems, and the ability to work within teams. The role offers a highly competitive salary...

Point72 Asset Management’s Technology team is building real-time treasury and trading support systems using scalable C#/.NET services and APIs with low latency. You’ll partner with traders and operations to translate requirements into production software and mentor a distributed team across the USA, Poland and India.You will also drive DevOps adoption,...

Sigma Software is seeking a Senior Golang Backend Engineer to join a cross-functional team delivering cutting-edge AdTech and cybersecurity solutions. You will design, develop, and maintain high-performance backend services in Golang, and contribute to building scalable, low-latency systems used by major internet platforms.You will collaborate with data...

Cosmose AI is seeking a strong Mid or Senior Java Engineer to scale the backend of our KaiKai Lock Screen and CMS, processing content for millions of users daily. You will design and maintain backend services, build scalable data pipelines, and collaborate with Product, Content, and Data teams to deliver meaningful features.We value ownership, proactive...

Vyntra Global, Warsaw-based, is seeking a Backend Software Developer to join the Financial Crime Product Development team in a hybrid setup (2 days on site). You will design and maintain Java backend services within a small autonomous agile team, delivering high-scale, production-grade software for banks and financial institutions.The role emphasizes...

Bratte is building Animates, an AI companion app that remembers you and reacts in real time using local animation tech. Our 27-person team has a dedicated backend focus, serving real traffic today and shaping the next version with founders.You’ll own production backend, scale real-time systems, and help design APIs and memory data layers. You will work...

Sigma Software ищет опытного инженера backend на Go для разработки высоконагруженных сервисов и распределённых систем. Ваша задача — создавать устойчивые архитектуры, работать с Kubernetes и облачными...