Fullstack Software Engineer - AI Modernization at Theodo | Paris

Join Theodo Apps as a Mobile Software Engineer!Since 2009, Theodo has been at the forefront of innovation, helping businesses design, develop, and deploy ingenious digital products by leveraging cutting-edge technology and Lean methodologies.With remarkable growth over the last 15 years, our team has expanded to over 700 talented Theodoers, primarily consisting of passionate Software Engineers dedicated to continuous improvement. Theodo has structured its operations into specialized entities focusing on technology (Theodo Apps, Theodo Cloud, Theodo Data & AI) and industries (Fintech, Govtech, Healthtech, Consumer Products). By 2025, Theodo is projected to generate €100M in revenue.Theodo Apps, our division specializing in multi-platform application development (mobile, web, and TV), has successfully delivered over 130 projects. We partner with our clients to design, develop, and deploy applications that transform user experiences.In just a decade, Theodo Apps has grown from 2 to 120 employees, achieving a revenue of €24 million in 2024!We collaborate with a diverse range of clients, from innovative entrepreneurs and SMEs to industry giants like TF1+, Carrefour, Urgo, and Compagnies des Alpes.Your Team:The technical team at Theodo Apps consists of 49 software engineers, tech leads, and architects, all from top engineering schools, along with Engineering Managers dedicated to your success.Your Future Responsibilities:As a Mobile Software Engineer, your mission will be to solve strategic challenges for our clients through technology while contributing to the growth of Theodo Apps by enhancing your skills and pursuing continuous improvement.- Design and develop multi-platform applications (mobile, web, TV)

Join Theodo Apps: Pioneers in Digital InnovationSince 2009, Theodo has empowered innovative businesses by designing, developing, and deploying ingenious digital products leveraging cutting-edge technology and Lean methodologies.With exceptional growth over the last 15 years, our team has expanded to over 700 passionate Software Engineers committed to continuous improvement. As we grow, we have structured our organization into specialized entities focusing on technologies (Theodo Apps, Theodo Cloud, Theodo Data & AI) and industries (Fintech, Govtech, Healthtech, Consumer Goods). By 2025, Theodo aims to achieve a revenue of €100 million.Having successfully completed over 130 projects, Theodo Apps specializes in cross-platform application development (mobile, web, and TV). We partner with our clients to design, develop, and deploy applications that transform user experiences.In just 10 years, Theodo Apps has grown from 2 to 120 employees and reached a turnover of €24 million in 2024!We collaborate with a diverse range of clients, including entrepreneurs, innovative SMEs, and large corporations like TF1+, Carrefour, Urgo, and Compagnies des Alpes.Your Team:The technical team at Theodo Apps consists of 49 software engineers, tech leads, architects, and engineering managers, all hailing from top engineering schools.You will be part of a dynamic team of 2 to 5 engineers, supported by a tech lead, an associate product manager, and a UX/UI designer.Your Future Responsibilities:As an Android Mobile Developer, you will play a pivotal role in developing our Android applications, ensuring exceptional performance and an optimal user experience. Your daily responsibilities will include:- Contributing to the design and architecture of robust, scalable, and maintainable Android applications, utilizing recognized paradigms such as MVVM, MVI, or Clean Architecture.- Developing native Android features in Kotlin, with a constant focus on performance, accessibility, and user satisfaction.

Join the Theodo Group: A Legacy of InnovationSince 2009, Theodo has been at the forefront of assisting innovative companies in the design, development, and deployment of ingenious digital products, leveraging cutting-edge technology and a Lean approach.With exceptional growth over the past 15 years, Theodo has expanded to a team of over 700 passionate Theodoers, primarily composed of Software Engineers dedicated to technology and continuous improvement. As we scale, our organization has evolved into specialized entities by technology (Theodo Apps, Theodo Cloud, Theodo Data & AI) and industry (Fintech, Govtech, Heathtech, Consumer Products Goods). By 2025, Theodo is projected to generate €100M in revenue.With over 130 successful projects completed, Theodo Apps specializes in the development of cross-platform applications (mobile, web, and TV). We partner with our clients to design, develop, and deploy applications that transform user experiences.In just 10 years, Theodo Apps has grown from 2 to 120 employees and reached a revenue of €24 million in 2024!Theodo Apps collaborates with entrepreneurs, innovative SMEs, and large corporations such as TF1+, Carrefour, Urgo, and Compagnies des Alpes.Our technical team comprises 120 software engineers, tech leads, and architects, all graduates from top engineering schools, supported by 13 Engineering Managers dedicated to their success.Your Mission:- Lead & Develop Tech Leads: Mentor 1 to 4 Tech Leads in their professional growth and fulfillment.- Ensure Technical Delivery: Safeguard code quality (3S: Stability, Security, Speed), uphold project milestones, and ensure robust architecture.- Contribute to Business Development: Engage in strategic discussions with clients (CIOs, sponsors), help identify new opportunities, and participate in pre-sales with our sales team.

Join Theodo: Innovating Since 2009Theodo is a pioneering group that has been assisting innovative companies in designing, developing, and deploying ingenious digital products since 2009, harnessing the best of technology and Lean methodologies.With a remarkable growth trajectory over the past 15 years, our team has expanded to over 700 Theodoers, primarily composed of passionate Software Engineers committed to continuous improvement. As we grow, Theodo has structured itself into specialized entities focused on various technologies (Theodo Apps, Theodo Cloud, Theodo Data & AI) and industries (Fintech, Govtech, Healthtech, Consumer Products). By 2025, Theodo aims to generate €100M in revenue.With over 130 projects completed, Theodo Apps is the group's entity dedicated to multi-platform application development (mobile, web, and TV). We support our clients in the design, development, and deployment of applications that transform user experiences.In the last decade, Theodo Apps has grown from 2 to 120 employees and achieved a revenue of €24 million in 2024!We collaborate with a diverse range of clients including entrepreneurs, innovative SMEs, and large corporations such as TF1+, Carrefour, Urgo, and Compagnies des Alpes.Your Future Responsibilities:As a Product Manager, your mission will be to assist the team in maximizing product value by prioritizing and delivering high-quality features that enhance customer satisfaction.- Prioritize and deliver high-value features while adhering to milestones and commitments made to clients.- Demonstrate team value and progress by making work visible and facilitating client decision-making (review decks, daily updates, etc.).- Understand client preferences and organize rapid and appropriate responses in case of issues, utilizing tools like...

Join Theodo: A Leader in Digital SolutionsSince 2009, Theodo has been partnering with innovative businesses to design, develop, and deploy cutting-edge digital products, leveraging the best of technology and Lean methodology.With remarkable growth over the past 15 years, Theodo has assembled a vibrant team of over 700 passionate Software Engineers dedicated to continuous improvement. Our organization has evolved into specialized units focused on technology (Theodo Apps, Theodo Cloud, Theodo Data & AI) and industries (Fintech, Govtech, Healthtech, Consumer Goods). By 2025, Theodo aims to achieve a revenue of €100M.Theodo Apps, with over 130 successful projects, specializes in the development of multi-platform applications (mobile, web, and TV). We assist our clients in the design, development, and deployment of applications that enhance user experiences.In just 10 years, Theodo Apps has grown from 2 to 120 employees, generating €24 million in revenue by 2024!We collaborate with a diverse range of clients, including entrepreneurs, innovative SMEs, and large corporations like TF1+, Carrefour, Urgo, and Compagnies des Alpes.Your Team:You will become part of a tech community of over 50 Theodoers, including software engineers, tech leads, engineering managers, and architects, providing opportunities for daily learning and growth.At Theodo, our tech teams are organized based on client needs. You will work in a small team (4 to 5 members) alongside Software Engineers, a Tech Lead, and a Product Manager. Together, you will closely collaborate with the client, regularly sharing progress, deepening problem understanding, and evolving the product to meet user needs effectively.Your Future Responsibilities:As a Fullstack Software Engineer at Theodo Apps, you will...

Join Theodo Apps as a Lead Product ManagerFounded in 2009, Theodo has been at the forefront of innovation, partnering with businesses to design, develop, and deploy cutting-edge digital products. Our success over the past 15 years has enabled us to grow to a team of over 700 passionate software engineers dedicated to technology and continuous improvement.With an impressive portfolio of over 130 projects, Theodo Apps specializes in multi-platform application development (mobile, web, and TV). We help our clients transform user experiences through innovative applications.In just a decade, Theodo Apps has expanded from 2 to 120 talented individuals, achieving a revenue of 24 million euros in 2024!Our clientele ranges from entrepreneurs and innovative SMEs to major corporations such as TF1+, Carrefour, Urgo, and Compagnies des Alpes.Key Responsibilities:As a Lead Product Manager, you will oversee complex product projects by driving the product vision, orchestrating delivery, and ensuring value creation for both clients and teams.- Define and communicate the product strategy in collaboration with clients: value modeling, product architecture, EPICs, balancing trade-offs, and ensuring technical-functional alignment.- Ensure successful delivery by coordinating multiple squads to deliver complex projects on time, within budget, and to the expected quality standards.- Foster team success by defining the optimal set-up (Theodo teams or partners), negotiating necessary resources, and adapting the organizational structure to meet project needs.

Join the Theodo Group and Be Part of Our Success StorySince 2009, Theodo has been a leader in supporting innovative companies through the design, development, and deployment of cutting-edge digital products, leveraging the best of technology and Lean methodologies.With exceptional growth over the past 15 years, our team has expanded to over 700 talented professionals, primarily software engineers dedicated to technology and continuous improvement. As we evolve, Theodo has structured its operations into specialized entities focusing on technologies (Theodo Apps, Theodo Cloud, Theodo Data & AI) and industries (Fintech, Govtech, Healthtech, Consumer Goods). By 2025, Theodo aims to achieve €100M in revenue.Having completed over 130 projects, Theodo Apps specializes in multi-platform application development (mobile, web, and TV). We empower our clients to create applications that enhance users' lives.In just a decade, Theodo Apps has grown from 2 to 120 employees, reaching a revenue of €24 million in 2024!Our clientele includes innovative startups, SMEs, and large corporations such as TF1+, Carrefour, Urgo, and Compagnies des Alpes.Your Team:You will be joining the Growth Team, which focuses on recruitment at Theodo. We believe strongly that Theodo’s growth hinges on our ability to attract, recruit, and engage the best tech and business talents in the market.As a recruiter at Theodo, you will play a pivotal role in this growth journey. You will oversee the entire recruitment process, from identifying talents to their successful integration within our teams.Your role involves attracting, evaluating, and engaging candidates that align with our business needs, corporate values, and client expectations. You will be responsible for

Role Overview Theodo is hiring a Lead Software Engineer to join its Paris office. This role involves leading a team of developers on impactful projects, shaping software solutions with modern technologies, and setting a high standard for quality. What You Will Do Guide a team of engineers through all stages of software development Work closely with team members to deliver reliable, well-crafted solutions Apply current technologies and development practices to real-world challenges Mentor and support developers in their growth Encourage open communication and foster a collaborative team spirit Who We’re Looking For Strong technical background in software engineering Experience leading or mentoring development teams Clear communicator who can motivate and inspire others Comfort working in Paris or relocating to the city

Role Overview Theodo is hiring a Lead Software Engineer in Paris. This role involves guiding software development projects and supporting a team of engineers. The position focuses on designing and building reliable, high-performance software that meets client expectations. What You Will Do Lead software projects from planning through delivery Work hands-on with the team to design and implement technical solutions Collaborate with colleagues from different functions to align on project goals Oversee project timelines and ensure milestones are met Mentor junior developers and encourage knowledge sharing Team and Culture This role supports a culture of continuous learning and improvement. The team values technical skill, open communication, and a shared commitment to delivering strong results for clients. Location This position is based in Paris.

At Theodo Apps, we are always on the lookout for exceptional talent to join our dynamic teams. If you don't see your ideal position among our current job listings, don't hesitate to reach out! We firmly believe that every unique talent has the potential to contribute to our success!

Role Overview Theodo is hiring a Lead Software Engineer for its fintech division in Paris. This role centers on guiding a team of developers to build and deliver software products for the financial sector. The position combines hands-on technical leadership with team mentorship and cross-team collaboration. What You Will Do Lead and mentor a team of software engineers focused on fintech projects Drive the design and development of new software applications for financial services Work closely with product, design, and other teams to deliver reliable, high-quality solutions Promote a culture of technical excellence and ongoing improvement within the team Location This position is based in Paris.

Discover Theodo's Journey and SuccessSince 2009, Theodo has been empowering innovative companies in crafting, developing, and launching ingenious digital products, leveraging cutting-edge technology and a Lean approach.Our distinctive methodology is built upon three core principles:- We have honed acknowledged expertise in key technologies for product design and development;- At every stage of the project, our priority is to create value for our clients;- We recruit the finest digital talents and nurture their ingenuity through a Lean approach.Theodo has experienced remarkable growth over the past 15 years, gathering over 700 passionate Theodoers, primarily Software Engineers dedicated to technology and continuous improvement. As we expand, our group has organized into specialized entities by technology (Theodo Apps, Theodo Cloud, Theodo Data & AI) and by industry (Fintech, Govtech, Healthtech, Consumer Products). By 2025, Theodo aims to achieve a revenue of €100M.Your Future Team:You will join a community of over 120 Theodo tech professionals: software engineers, tech leads, engineering managers, and architects, where you can exchange, learn, and grow daily.At Theodo, tech teams work on project-based teams, tailored to meet each client's needs. You will be part of a small team of Theodoers (4 to 5 members), including Software Engineers, a Tech Lead, and a Product Manager. Together, you will collaborate closely with the client, with regular updates to share progress, deepen understanding of their challenges, and evolve the product to align with user needs.Your Future Responsibilities:As a Fullstack Software Engineer at Theodo, your mission will be to design and develop valuable, high-performance, and sustainable digital products to address the challenges faced by our clients and their users.

Join Theodo as an LLM-Powered Software EngineerAt Theodo, we have been at the forefront of digital product development since 2009, empowering innovative businesses to design, develop, and deploy ingenious digital products through cutting-edge technology and Lean methodologies.Our unique approach is grounded in three core principles:- We have cultivated recognized expertise in key technologies for product design and development;- Regardless of project phase, our priority is to create value for our clients with every decision;- We recruit the best digital talent and nurture their ingenuity through our Lean approach.Theodo has experienced exceptional growth over the past 15 years, with over 700 Theodoers, primarily Software Engineers, who are passionate about technology and continuous improvement. As we expand, we have structured our teams into specialized entities by technology (Theodo Apps, Theodo Cloud, Theodo Data & AI) and by industry (Fintech, Govtech, Healthtech, Consumer Goods). By 2025, Theodo aims to achieve €100M in revenue.Your Future Responsibilities:Join our Business Critical Migration team as we support our clients in migrating legacy systems to modern, robust stacks using LLM and agentic workflows.You will collaborate with product and tech teams of 4 to 6 members, including Software Engineers, AI Architects, and IT Migration Delivery Managers, tackling complex and impactful challenges.As an LLM-Powered Software Engineer, your mission will be to establish and iterate on robust LLM workflows, integrated within the client code lifecycle.Specifically, you will:- Identify the technical components to migrate (e.g., controllers, pages, services…)- Implement LLM workflows or micro-agents to automate or translate code blocks- Generate retro-documentation from existing code- Configure and integrate open-source or internal LLM tools (e.g., cline, GenAIScript)

Join the Success Story of TheodoSince 2009, Theodo has been empowering innovative companies in the design, development, and deployment of ingenious digital products, leveraging the best of technology and Lean methodology.Our unique approach is built on three core principles:- We have developed recognized expertise in key product design and development technologies;- Regardless of the project stage, our priority in every decision is creating value for our clients;- We recruit the top digital talents and nurture their ingenuity through a lean approach.Theodo has experienced exceptional growth over the past 15 years, with our team of over 700 Theodoers, primarily Software Engineers, who are passionate about technology and continuous improvement. As we grow, the group has structured itself into specialized entities by technology (Theodo Apps, Theodo Cloud, Theodo Data & AI) or by industry (Fintech, Govtech, Healthtech, Consumer Products Goods). By 2025, Theodo aims to generate €100M in revenue.Join us at Theodo Extend, the new entity within Theodo, designed to meet a real-world need: more and more clients want to maintain control over product management while integrating top-level developers into their teams.In 2024, we collaborated with over 100 clients, including Carrefour, Dior, and Yves Saint Laurent, with 63 experts engaged in these missions.Your Mission:As a Software Engineer at Theodo Extend, you will be fully integrated into a client team but never alone.You will remain connected to our passionate community of engineers, receive training in best practices, and benefit from continuous support.You will work on:- Migrating an existing codebase to ensure its reliability, maintainability, and scalability through a complete transition to a modern stack.- Launching a V1 in just a few weeks, in high-pressure environments, while mastering the entire process.

Theodo at a Glance Since 2009, Theodo has partnered with forward-thinking companies to design, build, and launch digital products. The team combines technology expertise with Lean methodology to deliver results that matter. Theodo’s approach stands on three principles: Deep expertise in essential technologies for product design and development Consistent focus on creating value for clients at every project stage Recruiting top digital talent and fostering their growth through Lean practices Over the past 15 years, Theodo has grown to a team of more than 700, with most roles in software engineering and a shared drive for continuous improvement. The group is organized into specialized units by technology (Theodo Apps, Theodo Cloud, Theodo Data & AI) and by industry (Fintech, Govtech, Healthtech, Consumer Products Goods). Theodo aims to reach €100M in revenue by 2025. About the AI Modernization Practice The AI Modernization team leads Theodo’s efforts to become a European leader in applying AI to software development. This practice focuses on using AI to migrate legacy systems to modern languages and frameworks. The goal: reduce business, cybersecurity, and compliance risks tied to outdated systems. By combining controlled AI with a proven approach, the team delivers critical projects up to three times faster than traditional methods. The Team Structure Join a community of over 350 Theodoers: software engineers, tech leads, engineering managers, and architects. Theodo encourages daily learning and knowledge sharing across this network. Project teams are tailored for each client. As a Lead Software Engineer - AI Modernization, you’ll work in a small group of 4 to 5 people, typically including Software Engineers, a Tech Lead, and a Product Manager. Teams collaborate closely with clients, sharing updates, exploring challenges, and adapting products to user needs. The field of software engineering is changing with AI. This is a chance to develop as an AI-Native Tech Lead. Location Role based in Paris.

Join Theodo: Pioneers in Digital SolutionsSince 2009, Theodo has been at the forefront of innovation, helping businesses design, develop, and deploy ingenious digital products by leveraging the best technology and Lean methodologies.With exceptional growth over the past 15 years, Theodo now boasts a talented team of over 700 professionals, primarily composed of passionate Software Engineers dedicated to continuous improvement. Our growth has led to specialized entities within the group focusing on various technologies (Theodo Apps, Theodo Cloud, Theodo Data & AI) and industries (Fintech, Govtech, Heathtech, Consumer Products). By 2025, Theodo aims to generate 100M€ in revenue.At Theodo FinTech, our mission is to enhance the usefulness of finance for individuals, businesses, and society. We partner with major corporations, ScaleUps, and StartUps within the financial services sector to design, develop, and maintain accessible, sustainable, and socially beneficial digital products.As experts in financial services technology, Theodo FinTech delivers exceptional digital products at lightning speed with zero bugs and high security. Our team excels at integrating APIs from all B2B fintech platforms to create innovative embedded finance solutions.Your Responsibilities:As a Senior Full-Stack Software Engineer at Theodo FinTech, your role will involve:- Rapidly coding without bugs, utilizing coding assistants (Copilot, Cursor, Windsurf).- Designing features by contributing product ideas and identifying optimal technical strategies, while adhering to our delivery practices.

About Theodo Healthtech Theodo Healthtech builds digital solutions for the healthcare sector from its Paris office. The team focuses on applying artificial intelligence to real-world healthcare challenges. Role Overview: AI-Native Software Engineer This position centers on designing, building, and refining AI-powered applications for healthcare. The AI-Native Software Engineer works closely with colleagues from various disciplines to create tools that support better patient outcomes and more efficient healthcare operations. What You Will Do Collaborate with cross-functional teams to develop AI-driven applications for healthcare Design, implement, and optimize software that supports patient care and streamlines processes What We Look For Solid background in software engineering Strong interest in artificial intelligence technologies Motivation to improve healthcare through technology This role is based in Paris.

Join Theodo FinTech: Shaping the Future of FinanceSince 2009, Theodo has been at the forefront of digital innovation, assisting forward-thinking companies in designing, developing, and deploying ingenious digital products by leveraging cutting-edge technology and Lean methodologies.With remarkable growth over the past 15 years, Theodo has expanded to a team of over 700 talented individuals, primarily Software Engineers who are passionate about technology and continuous improvement. Our growth has led to the formation of specialized entities focusing on various technologies (Theodo Apps, Theodo Cloud, Theodo Data & AI) and industries (Fintech, Govtech, Healthtech, Consumer Goods). By 2025, Theodo is projected to generate €100M in revenue.At Theodo FinTech, our mission is to make finance more beneficial for individuals, businesses, and society at large. As experts in FinTech, we collaborate with our clients—including major corporations, ScaleUps, and StartUps in the financial services sector—to design, develop, and maintain digital products that are accessible, sustainable, and socially valuable.We pride ourselves on delivering exceptional digital products with zero bugs and high security in record time. Our expertise in integrating B2B fintech APIs enables us to create embedded finance solutions that meet the needs of our clients.Your Responsibilities:We are currently focusing on large-scale projects with complex products and architectures, developed by multiple squads at Theodo FinTech:- Engineering: Ensure the satisfaction of your technical clients (typically CTOs and VPs of Engineering) and business stakeholders by guaranteeing the quality of the architectures and the code produced by your teams.- Management: Lead and mentor your teams to achieve excellence in both development and client relationships.

Join Theodo as an Engineering Manager in Paris!Since 2009, Theodo has been a driving force in supporting innovative companies with the design, development, and deployment of ingenious digital products, leveraging cutting-edge technology and a Lean approach.Theodo has experienced remarkable growth over the last 15 years, now boasting a team of over 700 passionate software engineers dedicated to continuous improvement. As we expand, we have structured our organization into specialized entities focusing on different technologies (Theodo Apps, Theodo Cloud, Theodo Data & AI) and industries (Fintech, Govtech, Healthtech, Consumer Goods). By 2025, we anticipate generating €100M in revenue.Theodo Data & AI, established in 2016, is dedicated to data and AI solutions. Our mission is to guide clients in crafting and executing their data strategies, along with researching and developing state-of-the-art artificial intelligence solutions.Our company is on an upward trajectory, with Theodo Data & AI seeing over 30% annual revenue growth, creating exciting new opportunities for our team!The technical team at Theodo comprises 120 software engineers, tech leads, and architects from top engineering schools, supported by 13 Engineering Managers dedicated to their success.Your mission includes:- Leading and mentoring Tech Leads: You will support 1 to 4 Tech Leads in enhancing their skills and achieving personal growth.- Ensuring technical delivery: You will guarantee code quality (3S: stability, security, speed), adherence to milestones, and architectural robustness.- Contributing to business development: You will participate in strategic discussions with clients (CIOs, sponsors, etc.), help identify opportunities, and play a key role in pre-sales with our sales team.Your tools for success:• Direct management by Theodo's CTO or VP of Engineering• Lean management training from top Lean coaches• Access to advanced technology and resources to support your team's success