Top Software Engineer Jobs in Bucharest

Software Engineers at QuantCo will design and develop scalable solutions, integrate models into client businesses, and improve products based on client feedback.

As an Ubuntu Core Software Engineer, you will design and implement features for the embedded Linux operating system, maintain boot mechanisms, debug system-level issues, and collaborate with a global team.

As a Senior Tech Generalist, you'll build and maintain end-to-end systems, improve scalability, and ensure reliable financial operations while mentoring others in a dynamic team environment.

Design and implement backend trading services, own features end-to-end (schema, API, tests, UI integration), contribute to real-time infrastructure and client-facing APIs, and write integration tests against real dependencies.

Full-stack Developers at QuantCo build user interfaces for machine learning solutions, collaborating with data scientists and engineers to deliver actionable products.

Staff Software Engineer responsible for leading architectural evolution across a distributed rendering platform, contributing to core backend systems, and improving performance, reliability, scalability, testing, and delivery practices. The role includes mentoring engineers through pairing and design reviews, unblocking teams, shaping technical strategy, improving CI/CD and tooling, and aligning engineering investments with product and business goals.

Build and maintain integrations for North's agentic platform, own the end-to-end integration pipeline, create evals and tests to ensure reliability, tune tool descriptions, and help other engineers add and maintain integrations while using AI responsibly to improve performance and quality.

Responsible for designing, building, testing, and delivering new features. Analyze and fix bugs, improve existing code, and enhance network security skills.

As a Senior Software Engineer, you'll design and develop scalable distributed backend microservices, lead initiatives in voice platform integrations, and ensure the reliability and performance of voice pipelines.

Lead implementation of e-commerce customer onboarding and contract lifecycle features. Analyze requirements, design and build services using Java/Spring, REST and event-driven patterns, ensure CI/CD, testing and documentation, support consumers, maintain data processing and analytics pipelines, and share knowledge within Agile teams.

Leads and mentors a software engineering team while remaining hands-on with Java and full-stack development. Responsibilities include architecture, coding, code reviews, sprint planning, stakeholder collaboration, technical strategy, CI/CD, testing, monitoring, service ownership, and delivery accountability. The role requires building scalable microservices and REST APIs, optimizing database performance, managing technical risks, and supporting AWS-based production systems.

Design, build, ship, and own high-scale, user-facing product features across frontend, backend, and data systems. Define problems, scope and prioritize work, collaborate with Product, monitor production usage, debug incidents, improve reliability, review code, and mentor engineers. The role requires strong backend expertise alongside React proficiency and ownership from product discovery through long-term maintenance.

Build and ship production AI agents that help mobile app developers manage subscriptions and paywalls. Own agent orchestration, tool execution, context management, evaluation, observability, permissions, and human-in-the-loop controls. Develop reliable, secure, user-facing backend systems, scope projects independently, monitor adoption, improve features after launch, participate in architecture and incident response, and mentor engineers.

The Software Engineer will develop backend systems using Rust, manage multimodal data, and improve data infrastructure with a focus on performance and design ownership.

Canonical seeks open-source enthusiasts to optimize Ubuntu for new silicon technologies, collaborating with teams and customers to enhance software quality and performance across various platforms.

Design and develop services for automating work with a large server fleet while engaging in DevOps processes.

Design and develop services for monitoring servers, improve metrics pipelines, automate maintenance workflows, and investigate incidents to ensure infrastructure reliability.

Design and develop embedded software (C/C++) for wireless communications platforms, including high-level applications and L2-L3 protocol stacks. Participate in requirements, design, coding on Linux, unit testing, and collaborate with systems, hardware, and verification teams.

As a Senior Java Software Engineer, you will design and deliver scalable, high-quality software solutions for energy management systems, collaborating with global teams and employing best practices in coding and Agile methodologies.

The Senior Java Software Engineer will develop and maintain software solutions for energy management, coordinate with global teams, and ensure code quality through best practices.

This role involves developing scalable back-ends and microservices, creating optimal architecture, and collaborating with teams to build resilient APIs and systems while ensuring performance and stability.

Design and implement reliable, high-performance Rust services and libraries powering trading, payments, and crypto products. Build scalable distributed systems, network services, and asynchronous applications for revenue-critical, low-latency environments. Debug issues across the operating system, network, and application layers; collaborate with product teams; own systems end to end; and mentor engineers while contributing to technical culture.

The Lead Golang Software Engineer develops server solutions, leads technical designs and code reviews, mentors colleagues, and ensures the quality of engineering practices in the Commercial Systems unit.

The Python Software Engineer will develop and maintain test automation tools for hardware certification and improve Linux testing methods.

You will build and maintain container images, automate CI/CD processes, engage with the community, and mentor junior team members in a collaborative environment.