Top Software Engineer Jobs in Paris

Design and build C2 and mission-planning software for interceptor systems. Develop high-performance C++ components with Python bindings, implement optimization, trajectory planning, sensor fusion, and real-time replanning algorithms, and ensure reliability through testing, benchmarking, code reviews, and performance analysis. Collaborate with systems, guidance, and estimation engineers on safety-critical defense software.

Software Engineer Interns will contribute to Pigment’s SaaS platform through backend, frontend, infrastructure, or data-ingestion projects. Responsibilities include upgrading and improving connectors, developing shared tooling, exploring LLM-assisted model imports, translating structures and formulas, and creating validation tests. Interns collaborate with experienced engineers across the application lifecycle and deliver reliable, scalable code using Pigment’s cloud-native technology stack.

Designs, builds, tests, deploys, monitors, and operates full-stack applications and Domain APIs using Domain-Driven Design. Develops .NET backend services and modern frontend applications, shapes domain models and API contracts, and applies event-driven architecture and cloud-native practices. Collaborates with engineers, architects, product managers, security teams, and international business stakeholders. Contributes to architecture, technical standards, code reviews, production issue resolution, and mentoring less-experienced engineers.

Develop software for utility-scale photonic quantum computers, including a compiler that translates high-level circuits into hardware-aware pulse schedules. The role also involves digital-twin development, quantum hardware simulation, architectural strategy, roadmap ownership, and collaboration across software, experimental hardware, and theory teams.

Develop computational software and physics-based models for feature-scale semiconductor process simulation, including plasma etch, deposition, particle transport, surface chemistry, geometry evolution, and multiphysics phenomena. Optimize simulations for CPUs and GPUs, validate models against experimental data, collaborate with physicists and process engineers, and contribute to architecture, testing, publications, patents, and emerging machine-learning-driven digital twin technologies.

Develop efficient C++ software for brain-computer interface and wearable sensing products. Integrate sensor data acquisition and machine learning inference with real-time performance across wearable hardware and cloud backends. Build performance and algorithm-quality analysis tools, write tested code, and collaborate with embedded systems, hardware, software, and ML teams on system integration and technical tradeoffs.

Build and improve full-stack web application features for investment bank trading workflows. Responsibilities include developing backend logic and frontend UI, designing APIs and components, translating user needs into maintainable code, writing tests, participating in code reviews, fixing production bugs, and learning software development, DevOps, and product iteration practices in a startup environment.

Build, test, deploy, and maintain scalable web and mobile applications. Own features from concept through launch while collaborating with Product, Design, Data Science, and engineering teams. Apply automated testing, strong code quality practices, relational database and schema design expertise, analytical problem-solving, and user-focused design. Work within agile methodologies and contribute to continuous deployment, production monitoring, knowledge sharing, and ongoing engineering improvement.

Design, develop, and maintain scalable backend applications using TypeScript, Node.js, and NestJS. Collaborate across engineering, product, design, and frontend teams throughout the software development lifecycle. Integrate APIs, troubleshoot and optimize applications, document solutions, apply security best practices, and contribute to architecture and technology decisions. Provide technical guidance to junior developers while delivering clean, tested, and maintainable code.

Develop and maintain Python APIs and services for a computer vision platform. Improve service speed, reliability, and GKE infrastructure; contribute to technical designs, coding, documentation, and agile development. The role works with Docker, RabbitMQ, PostgreSQL, Kubernetes, Flask, and cloud infrastructure while supporting vehicle damage detection products.

Design and implement modern C++ features for a listed financial instrument framework. Build maintainable APIs, optimize memory, CPU usage, and SQL queries, investigate and resolve client issues, write unit and regression tests, and participate in code reviews and technical design discussions. Collaborate closely with development and product teams in an Agile environment.

Design, deploy, configure, and operate a bare-metal trading platform spanning physical infrastructure, trading applications, observability systems, and intent-driven management. Participate in on-call support, troubleshoot critical production issues, collaborate with traders, researchers, developers, and service providers, and convert pragmatic fixes into engineered solutions. The role requires Linux expertise, scalable production systems experience, and strong computer science fundamentals.

Build and own scalable full-stack web platforms using TypeScript, Node.js, modern frontend frameworks, databases, data warehouses, and workflow orchestration. Responsibilities include platform architecture, APIs, data pipelines, analytics modeling, interactive geospatial visualizations, privacy-aware data handling, performance, monitoring, reliability, roadmap contribution, and end-to-end ownership. The role is onsite five days per week in Paris and includes relocation and visa sponsorship support.

Build and own consumer-facing web experiences that drive app acquisition and conversion. Responsibilities include developing high-performance React and Next.js interfaces, deep linking and app entry flows, dynamic sharing previews, analytics instrumentation, A/B testing, growth experiments, and end-to-end architecture, monitoring, and reliability. The role requires autonomous frontend and backend work, strong product judgment, and onsite collaboration in Paris.

Develop and optimize Unity-based LiDAR simulation features, collaborate with R&D, 3D artists and engineers, prioritize releases and bug fixes, redesign codebase, build dynamic simulation tools for model training and demos, and continue crowd simulation and 3D asset integration while profiling for performance.

Build and maintain Ruby on Rails APIs for internal workflows, from stakeholder discovery and requirements refinement through design, testing, release, and evaluation. Write secure, maintainable code handling authentication, authorization, and sensitive data. Troubleshoot API issues, add regression coverage, participate in design discussions, review code, document decisions, and collaborate asynchronously in a distributed agile team.

Design, develop, and maintain secure backend services for cloud key management, secrets management, and audit systems. The role involves Go development, cryptographic operations, HSM and PKCS#11 integration, REST APIs, infrastructure automation, observability, PostgreSQL, and security compliance. The engineer will collaborate with infrastructure teams to build reliable, scalable, and secure cloud services.

Develop production Rust code for managing, reconfiguring, and adapting cloud resources within a Kubernetes development platform. Collaborate on architecture, infrastructure, and feature design; use AI to improve delivery; and work directly with users to gather requirements and debug complex distributed environments. The role requires strong systems thinking, cloud-native infrastructure knowledge, and effective async collaboration in a remote-first startup.

Leads architecture, development, optimization, testing, and delivery of modern C++ 3D software for clinical dental applications. Owns rendering, geometry, APIs, CI/CD, and cross-language integrations while applying AI-assisted development practices. Investigates complex defects, mentors engineers, leads technical discussions, collaborates across product and manufacturing teams, and ensures compliance with medical device software quality processes.

Build and scale Nuitee’s flight infrastructure from a production product into reliable API-first platform services. Responsibilities include API design, caching volatile flight offers, modeling booking data, supporting booking changes, cancellations and refunds, integrating NDC and legacy GDS flows, and improving performance and reliability. This hands-on individual contributor role requires deep backend and API expertise, flight-domain knowledge, Python experience, and ownership in a small team.

Design and build a scalable forecasting platform handling diverse data types; develop real-time exploration tools, secure APIs and SDKs; implement monitoring, alerting, and data scraping automation; integrate ML models into pipelines; iterate from user feedback; and mentor early engineering hires.

Build and maintain ERP business management features across backend services, APIs, databases, and user interfaces. Develop reliable software, implement database models and schema changes, investigate issues, write tests, monitor releases, conduct code reviews, and communicate risks. The role requires professional software development experience and offers opportunities to grow into larger engineering responsibilities while working with technologies including Python, Django, React, PostgreSQL, AWS, and Kubernetes.

Designs and builds Notabene’s Go-based transaction platform for secure, scalable, multi-tenant crypto transfers. The role focuses on distributed systems correctness, PostgreSQL performance, cloud infrastructure, observability, auditability, and regulated-data security. The engineer owns production operations, writes technical designs, reviews code, mentors teammates, collaborates with product and compliance teams, uses AI coding agents, and participates in on-call rotations.

Design and implement scalable software solutions supporting research workflows and data analysis. Lead technical decisions, develop microservices and APIs, establish engineering standards, optimize cloud infrastructure, and promote CI/CD and DevOps practices. Collaborate across teams, mentor junior engineers, contribute to testing and architecture, and help build an innovative engineering culture within Sanofi’s R&D organization.

Build and own the backend financial infrastructure for B2B lending and payments. The role covers loan application workflows, loan lifecycle payment processing, ledger logic, supplier disbursements, reimbursements, and collateral audit workflows. The engineer will partner with clients and business stakeholders, define technical requirements, deliver scalable distributed systems, and maintain transaction reliability, security, and correctness.