Freelance Senior iOS Engineer (Monetization) - BeReal

About BeRealAt BeReal, our mission is to champion authenticity in the realm of social media. We empower our community to share unfiltered moments, fostering genuine connections and celebrating the beauty of real life. With a passionate, international team of over 70 members and more than 40 million monthly active users, we are on a mission to scale BeReal in…

Voodoo is looking for a Senior Machine Learning Engineer in Paris to design and implement machine learning algorithms for mobile games. This position centers on building technology that enhances the gaming experience for millions of players. Key responsibilities Develop and deploy machine learning models specifically for mobile gaming applications Work closely with product and engineering teams to bring algorithms into live products Experiment with new methods to improve gameplay and increase user engagement Working at Voodoo Voodoo is recognized for its creative approach to mobile gaming and commitment to innovation. The company values practical solutions that make a real difference in game development and player satisfaction.

At Swile, we are committed to enhancing professional experiences through innovative product solutions that alleviate daily challenges and elevate employee satisfaction. Our cutting-edge offerings in Fintech, Travel, HR, and Employee Benefits serve over 5.5 million users across 85,000 companies in France and Brazil, making a significant impact on the workplace.As a Senior Software Engineer, you will play a pivotal role in problem-solving, blending creativity with technical expertise. Your focus will be on delivering high-quality solutions swiftly and effectively, addressing both business and engineering challenges with innovative strategies rather than being restricted to specific technologies.

Join Malt as a Senior Engineering Manager specializing in Compliance, where you will lead a dynamic team to ensure adherence to regulatory standards and foster innovative engineering practices.

Join Talan as a Senior MLOps Consultant Engineer, where you will play a pivotal role in shaping cutting-edge machine learning operations. Collaborate with a dynamic team to develop, deploy, and maintain scalable ML solutions that drive business innovation.

Become a pivotal member of a visionary team that is reshaping global living standards.At The Flex, our mission is to transform the rental experience, making it instantaneous, intelligent, and seamless—much like booking a ride.Our bold ambition? To empower individuals to live anywhere, at any time, without the usual hassles.Utilizing our advanced automation engine, Base360.ai, we are crafting a revolutionary operating system for modern renting—integrating property data, streamlining operations, and facilitating effortless stays across the globe.If you are passionate about developing products from start to finish, have a keen eye for user experience, and thrive on managing tangible systems that impact real users, this role is tailored for you. What You'll CreateAs a Senior Product Engineer, you will navigate the intersection of product, engineering, and operations.You will take ownership of features from conception to deployment—crafting the product, designing the architecture, coding, and implementing enhancements that significantly affect guests, operators, and partners.This position is ideal for engineers who prioritize product development over ticket resolution and are deeply invested in usability, performance, and tangible results. Your Key ResponsibilitiesOwn Product Features End-to-EndDesign, create, and enhance core product experiences across both web applications and APIs.Build for UsersConvert genuine operational and user challenges into straightforward, user-friendly product solutions.Ship Fast, Learn FasterRelease frequently, collect feedback, and continuously iterate.Design Scalable SystemsDevelop clear, maintainable architectures that grow alongside the platform.Automate the ExperienceLeverage automation and smart workflows to eliminate friction for both guests and operators.Collaborate CloselyPartner closely with product, design, data, and operations teams to transform ideas into impactful solutions. Ideal Candidate ProfileProven experience in developing user-facing products as a senior engineer.Proficient in working across frontend, backend, and APIs.Familiarity with modern web technologies (React, Node.js, cloud-native platforms).A strong product-oriented mindset—focused on understanding why a feature is developed, not just how.

Join Vibe and Transform Streaming TV AdvertisingAt Vibe.co, we are revolutionizing the way brands connect with audiences in today’s streaming landscape. We see streaming TV not merely as a platform for brand awareness but as a powerful performance marketing channel offering immense potential. Our mission is to build the infrastructure that will unlock this $100 billion opportunity.Vibe.co delivers an Audience First Streaming TV Advertising solution, enabling marketers to harness the full power of TV as a growth channel. Our comprehensive platform integrates precision audience targeting, AI-driven insights, real-time campaign optimization, and effective incrementality measurement, equipping brands of all sizes with the same level of accuracy and transparency they expect from digital channels.With the trust of over 10,000 brands and coverage reaching more than 120 million households across 500+ applications and channels, Vibe.co boasts an impressive average return on ad spend of 250% and a 20% lift in sales. In under two years, we achieved a remarkable $100 million revenue run rate, placing us among the fastest software companies to reach this milestone.Supported by renowned investors such as Hedosophia, Elaia, and several angel investors including Carolyn Everson of The Walt Disney Company, we are proud to be recognized as the leading platform in streaming TV advertising. Founded in 2022, Vibe.co is at the forefront of bringing advanced performance marketing to the rapidly growing media sector.Your Role as a Senior Software Engineer - SREAs part of our Infra Platform team, you will play a critical role in the engineering backbone of Vibe. This team is responsible for hosting, provisioning, observability, CI/CD, internal tools, security, and compliance. Every product and platform team relies on the solutions we develop.You will report directly to our Lead Platform Engineer and collaborate closely with the team to establish the technical direction and uphold the infrastructure standards that are vital for the company’s success. Given the rapid growth of our platform, which is currently utilized by over 60 engineers daily, we are seeking a candidate who will take ownership and drive the scaling process. You will engage with infrastructure that processes over 600,000 queries per second, ensuring optimal latency and performance.

Are you looking for a pioneering team that embodies a culture of continuous testing and learning, enabling you to truly pursue your ambitions? Look no further! At SFEIR, your career progression is in your hands—whether you want to advance vertically, horizontally, or across different domains. Your PlaygroundTech Stack: Python, FastAPI, Docker, Kubernetes, TDD.SFEIR AI: A dedicated path to mastering generative AI and agentic coding.Community: 140 Google Cloud certified experts, 30 Google Authorized Trainers, 7 Google Developer Experts. Your ResponsibilitiesDesign and develop robust, high-performance, and scalable APIs using Python and FastAPI.Ensure code excellence through unit and integration testing, TDD, and active participation in code reviews.Architect Cloud-Native services (primarily GCP) using Serverless or containerized approaches (Kubernetes, Docker).Contribute to the industrialization of our products by developing CI/CD strategies and implementing DevOps practices (GitHub Actions).Integrate AI/GenAI solutions to transform complex business processes.Ensure the smooth operation of applications in production (observability, monitoring, performance optimization). Your ProfileYou have at least 4 years of experience in Python development.Proven expertise in FastAPI and REST API architecture.Strong proficiency in Cloud environments (GCP/AWS) with experience in Serverless architectures.A keen understanding and adherence to coding best practices (TDD, code reviews, Clean Code).Curiosity about Generative AI and new technologies. Why Join SFEIR?Every Sfeirian is supported by an Engineering Manager.Opportunities for career advancement into Staff Engineer, Principal Engineer, or Engineering Manager roles.Continuous training with access to Google Cloud Skills Boost.

Join our dynamic team as a Senior iOS Engineer and bring your expertise to an application that positively impacts millions of users globally. This is an exciting opportunity to contribute to a rapidly expanding product consistently ranked among the Top 10 most downloaded Health and Fitness apps. At Fabulous, you will collaborate with a talented team of iOS Developers, a visionary CTO, an award-winning designer, and a dedicated group of researchers within a leading behavioral economics center.If you are passionate about iOS app development and eager to drive technological advancements while helping individuals cultivate healthier habits, we invite you to become part of the Fabulous mobile team.Key Responsibilities Utilize your technical expertise throughout all phases of feature development. Produce high-quality, modular, and testable code that includes business logic shared with the Android application via the J2Objc tool. Participate in the preparation of essential project documentation. Design user interfaces based on mock-ups from our UI/UX designers, incorporating engaging animations. Contribute to the enhancement of our processes and standards. Qualifications A minimum of 5 years of programming experience in either Objective-C or Swift. Proven experience in developing, releasing, and maintaining native iOS applications. Familiarity with Java or a strong willingness to learn. Ability to work collaboratively within a team environment; open to giving and receiving constructive feedback. Experience in designing clean and maintainable APIs. Proficiency in multithreaded programming. Experience in writing unit tests and ensuring code is testable. Preferred Qualifications Experience as the author of live production app(s) available in the App Store. Knowledge of SwiftUI and modern Swift API design and concurrency patterns (Combine, async await, Actors, etc.). Hands-on experience with Java and Android applications. Experience using the Google Firebase tool. BenefitsJoin a company that not only values your contributions but also offers a supportive work environment focused on your well-being and professional development.About UsWe are an award-winning health, wellness, and coaching company that develops apps recognized globally as top-tier. Our science-based approach is dedicated to the tech-for-good initiative, empowering individuals to lead fulfilling lives. Every team member at Fabulous is devoted to leveraging evidence-based research to discover optimal strategies for meaningful life changes.

Role overview The Senior Corporate Security Engineer at Nexthink plays a central role in protecting digital assets and ensuring the integrity of the corporate environment. The position involves hands-on security work and regular collaboration with teams throughout the company. Key responsibilities Partner with colleagues across departments to implement effective security measures. Conduct risk assessments to identify potential vulnerabilities and recommend solutions. Respond to security incidents and help coordinate the steps needed for resolution. Create and maintain security protocols and frameworks that align with industry standards. Location This position is based in Paris.

Join our innovative team at Ledger, where we are redefining digital ownership and empowering individuals to manage their value with freedom. Our mission is to make self-custody accessible for everyone, fostering a world in which users, creators, and enterprises can confidently manage their financial futures. We thrive on curiosity and strive to create solutions that challenge the status quo, ensuring our technology is available to all.As a leading global platform for digital assets and Web3, Ledger secures over 20% of the world's crypto assets through our advanced devices. With headquarters in Paris and additional offices worldwide, our diverse team of around 600 professionals is dedicated to developing state-of-the-art products and services for securely managing crypto assets. We have successfully sold over 7.5 million units of our Ledger hardware wallets across 200 countries.The TeamOur Data team plays a pivotal role in leveraging data to inform strategic business decisions and enhance our product offerings. As a crucial member of this team, you will engage in end-to-end data projects, from defining key metrics and building robust data pipelines to deploying analytical models. Your insights will drive company performance assessments, user behavior analyses across various protocols, and will directly contribute to Ledger's growth and security strategies. If you are a passionate data professional eager to make an impact in the cutting-edge Web3 ecosystem, we invite you to apply for this role.Key ResponsibilitiesData Architecture & Modeling: Design and maintain scalable data pipelines (ELT) utilizing dbt and Airflow, optimizing our Snowflake warehouse for performance and clarity.Complex Data Mapping: Transform raw, unstructured technical data into clean, actionable business entities.Stakeholder Partnership: Collaborate with Product, Engineering, and Finance teams, translating high-level business objectives into technical specifications.

About UpflowUpflow is a pioneering SaaS startup specializing in advanced cash collection technology designed to help B2B companies streamline their payment processes and get paid more efficiently.Founded in 2018, we have quickly gained the trust of hundreds of businesses across the US and EMEA, partnering with notable clients such as Lattice, ProductBoard, and Instawork. Our growth has been fueled by leading investors including YCombinator, eFounders, and prominent business angels from companies like N26, Square, Mercury, Uber, and NetSuite.Join us for an exciting opportunity to work within a rapidly evolving Fintech landscape in a diverse and international setting.To learn more about our team and culture, please visit our careers page at www.upflow.io/careersAbout the RoleAs a Senior Backend Engineer, you will be part of a compact and dynamic team based in Paris or working remotely, dedicated to developing impactful features for our users. Your responsibilities will encompass a variety of areas, including integrations with third-party financial systems like ERPs and billing tools, real-time data synchronization for millions of financial transactions, and managing our REST API. We prioritize data accuracy and reliability at scale, ensuring seamless financial data exchange between systems.We embrace continuous deployment (averaging 10 deployments per day) and foster a culture of pragmatism, ownership, and a growth mindset.For insights into our engineering practices, refer to this article.Your ResponsibilitiesIn your role at Upflow, you will:Design and implement complex, high-impact features from inception to completion.Work closely with the product manager and fellow engineers to convert business needs into technical solutions.Deploy clean, maintainable code to production on a daily basis.Engage in code reviews, offering and receiving constructive feedback.Diagnose and resolve intricate data and product challenges.Optimize application performance and scalability.

Join our innovative team at Datadog where we're pioneering AI-assisted tools designed to enhance developer efficiency by autonomously generating tests, resolving bugs, and optimizing performance. We are in search of a versatile and product-focused engineer to collaborate swiftly in defining and launching products that empower our customers to become 10x developers. At Datadog, we cherish our office culture, which fosters relationships, collaboration, and creativity. We embrace a hybrid work environment that allows our team members to achieve a work-life balance that suits their individual needs. What You’ll Do: Collaborate intimately with users, designers, product managers, and data scientists on cutting-edge LLM-based agents. Develop prompts, evaluations, and tools for interacting with code, while engineering systems for production integration within Datadog products. Prototype solutions, assess their real-world effectiveness, and iterate closely with users before launching. Stay abreast of the latest research in LLM prompting, agent development, and code editing. Collaborate with other Datadog teams to enhance functionalities, such as integrating with IDE extensions to provide a CoPilot-like assistant or utilizing Dynamic Instrumentation to gather more runtime data from production and pre-production settings. Who You Are: You are a backend engineer with a minimum of 5 years of experience in languages such as Go, Java, or Python, and you value simplicity and performance in code. You have experience deploying software that incorporates LLMs into production. You are enthusiastic about Generative AI and its potential to boost the productivity of software engineers. You possess relevant experience with Large Language Models, large-scale systems, data sets, machine learning, or related fields. You excel as a community ambassador, steering technical discussions towards pragmatic solutions. You thrive in a dynamic, high-growth startup environment that values its engineers and customers. You have a background in writing developer tools (e.g., IDEs, static code analysis tools, compilers). You have a proven ability to utilize AI coding tools in daily workflows, validating, critiquing, and refining AI-generated outputs. Bonus: You are driven to explore how AI can revolutionize software engineering practices and contribute to the development of AI-enabled products.

believe is hiring a Senior Software Engineer with a focus on React and Java for its Paris office. This role centers on creating web applications that deliver effective user experiences. Key responsibilities Design and build web applications using React and Java Collaborate with colleagues across different teams to understand requirements and deliver solutions Support ongoing enhancements to software products Location This position is based in Paris.

Shift Technology is at the forefront of revolutionizing the insurance industry through advanced AI solutions. Our platform integrates generative, agentic, and predictive AI to enhance underwriting, claims management, and fraud detection, yielding operational efficiencies and outstanding customer experiences. Renowned by leading insurers globally, Shift delivers impactful AI solutions at scale.Our culture thrives on innovation, trust, and a commitment to transforming insurance via our SaaS platform. Our diverse team, representing over 50 different nations, is collaboratively shaping the future of insurance.Our Engineering team is essential to the value we provide to our clients. We tackle complex challenges both within our squads and in collaboration with other teams across the organization.Join us as we redefine how data drives decision-making by developing powerful, scalable software and data platforms. If you're passionate about distributed systems, API development, or enabling data-driven insights, we have exciting opportunities for you.Our technology stack includes .NET Core (C#), Python, MS SQL Server, ElasticSearch, Spark, Azure Data Factory (ADF), GoodData, Terraform, and more. We are evolving towards distributed data systems on cloud platforms, presenting stimulating challenges in both bulk and real-time processing.

Join Talan as a Senior Data Engineer and leverage your expertise in Dataiku to drive innovative data solutions. In this pivotal role, you will collaborate with cross-functional teams to design and implement scalable data pipelines and analytics frameworks. Your contributions will empower data-driven decision-making and enhance business intelligence.

About NablaAt Nabla, we are a dynamic collective of entrepreneurs, clinicians, and engineers dedicated to reinvigorating the joy of practicing medicine.In collaboration with a community of innovative clinicians, we have leveraged cutting-edge machine learning to create Nabla: the premier AI assistant designed to restore the human connection in healthcare. By optimizing clinical documentation, Nabla empowers clinicians to prioritize what truly matters—their patients. Currently, over 85,000 clinicians from more than 130 healthcare organizations rely on Nabla to enhance their daily care delivery.We are embarking on an ambitious journey to integrate ambient listening, dictation, coding, and command functionalities into a proactive assistant that seamlessly streamlines both clinical and financial workflows.With a recent $70M Series C funding, we are expanding our team to build the next generation of clinical AI and enhance the lives of clinicians and patients worldwide.This is an exciting moment to join our mission!The Best of AI Serving HealthcareNabla’s remarkable success is a testament to three years of dedicated product development.Guided by former Meta AI Research engineers, our team has consistently envisioned how AI can transform healthcare delivery. Our Machine Learning team is at the forefront of utilizing the latest advancements to unlock AI’s full capabilities within the healthcare sector.Yann LeCun, Chief AI Scientist at Meta and Turing Award laureate, serves as an advisor for Nabla.Engineering Excellence at NablaAt Nabla, our engineering culture is agile, innovative, and deeply technical. Our teams encompass machine learning, native desktop applications, and platform infrastructure, working together to deliver AI reliably and at scale in clinical settings.Your TeamIn our organization, product development is a collaborative effort led by Engineering and Product, structured into cross-functional squads focusing on specific product areas. Each squad comprises product managers, designers, engineers of various specializations, and domain experts, functioning with high ownership. As a Senior Back-End Engineer, you will be an integral part of one of these squads, contributing from end to end to a specific product segment.What You'll DoIn your role as a Senior Back-End Engineer, you will be instrumental in scaling Nabla’s AI-powered healthcare platform. You will own key components of our back-end systems, closely collaborate with product and machine learning teams, and influence the technical direction of our projects.

As a Senior Sales Engineer at Datadog, you will leverage your technical expertise to deliver compelling sales presentations, product demonstrations, and assist with technical evaluations (Proofs of Value). In this role, you will collaborate closely with the Sales team to qualify and close business opportunities while providing valuable feedback to the product team to influence feature prioritization based on insights from customers, competitors, and partners. At Datadog, we highly value our collaborative office culture, fostering relationships and creativity. Our hybrid workplace model allows our team members to achieve a work-life balance that suits them best. Key Responsibilities: Collaborate with the Sales team to effectively communicate the comprehensive Datadog value proposition, vision, and strategy to prospective customers. Lead technical engagements with clients during the trial phase, articulating Datadog's value based on their activities, and addressing any identified concerns to ensure successful outcomes. Close complex technical opportunities through advanced knowledge of competitors, technical expertise, and credibility. Deliver product and technical briefings/presentations to prospective clients. Maintain detailed notes and feedback in CRM regarding customer interactions, noting both successes and challenges. Proactively engage with customers and Datadog teams to provide product feedback and analyze the competitive landscape. Who You Are: You are passionate about educating customers on observability risks that are critical to their business and can develop and execute effective evaluation plans. You possess strong written and oral communication skills, with the ability to articulate both the business value and technical benefits of our offerings.

At Front, we are revolutionizing customer operations with our unique platform designed for the complexities of B2B interactions. Our solution ensures every team, tool, and customer conversation remains connected, empowering companies to scale while maintaining meaningful relationships. Unlike others that focus on simple interactions, Front excels in managing the intricacies of B2B customer relationships, and we proudly serve over 9,000 businesses, including industry leaders like Uber Freight, Navan, and Stripe.Supported by prominent investors such as Sequoia Capital and Salesforce Ventures, Front has successfully raised $204 million from top-tier venture capitalists and independent investors, comprising notable executives from Atlassian, Okta, Qualtrics, Zoom, and PagerDuty. Our commitment to creating a positive work environment has earned us multiple accolades, including Built In's 100 Best Midsize Places to Work in SF 2025, Top Places to Work by USA Today 2025, and #4 on Fortune’s Best Workplaces in the Bay Area™.In the Workflows pod, our goal is to transform complexity into streamlined processes through automated workflows, allowing our customers to achieve operational excellence.Key Responsibilities:Work closely with product managers, designers, and other engineers to develop innovative solutions.

Join our dynamic team as a Senior Quality Assurance Engineer, where you will play a critical role in ensuring the highest standards of software quality. You will collaborate closely with development teams to identify, document, and resolve defects, while also implementing testing strategies that enhance product performance and reliability.Your expertise will be invaluable in driving the QA process, automating testing procedures, and mentoring junior staff. If you are passionate about software quality and thrive in a fast-paced environment, we want to hear from you!