Senior Front-end Developer (Angular / React) at Conflux | Utrecht

Elevate Complex Front-end Challenges to New HeightsAs a Senior Front-end Developer at Conflux, you will play a pivotal role in guiding the technical direction. You will assist organizations in overcoming intricate front-end challenges while enhancing team collaboration, architecture, and code quality. Your expertise will merge technical depth with advisory s…

Elevate complex React environments to new heights.As a Senior Front-end Developer at Divotion, you will play a crucial role in guiding React projects. You will assist organizations with intricate front-end challenges, enhancing architecture, scalability, and code quality to meet enterprise standards.You will blend deep technical expertise with advisory skills, taking ownership in client environments where performance, maintainability, and long-term development are paramount.Your Responsibilities:Engage in strategic React projects for clients where scalability, performance, and stability are essential. You will serve as a technical sparring partner for both developers and stakeholders.Specifically, you will:Design and implement enterprise-grade React architectures.Establish and maintain front-end standards and design systems.Implement scalable state management solutions (Redux, Zustand, etc.).Advise on tooling, CI/CD, testing strategies, and performance optimization.Review code and mentor fellow developers.Collaborate with backend, UX, and DevOps at the architectural level.Actively contribute to knowledge sharing within Divotion (knowledge sessions, events).Qualifications:HBO+/WO work and thinking level.A minimum of 6 years of experience as a React Front-end Developer in complex environments.In-depth expertise in React (hooks, performance, architecture).Strong experience with TypeScript and component-based development.Familiarity with modern frameworks such as Next.js (preferred).Experience with testing frameworks (e.g., Jest, React Testing Library, Playwright, Vitest, Cypress).Experience with modern build and deployment pipelines.Affinity for cloud environments.Excellent communication skills and persuasive advisory capabilities.Fluent in Dutch.Benefits:Challenging React assignments with visible impact.Significant autonomy and influence over technical direction.Opportunities for deepening knowledge, coaching, and sharing.Personal soft-skills program with external guidance.Flexible employment terms (salary, mobility, leasing, tooling).A supportive community focused on craftsmanship.About DivotionDivotion is a specialized IT consultancy where dedicated professionals work passionately on solutions that truly function. We combine technical excellence with a human-centered approach, collaboratively building sustainable software and careers.Join DivotionWe welcome talent from diverse backgrounds and encourage everyone to apply, regardless of gender, background, or other characteristics.

Are you passionate about working as a Senior Java Developer in an environment that prioritizes growth, trust, and enjoyment? At Conflux, we invest not only in your career but also in you as an individual. You will have the freedom, trust, and ample opportunities to develop yourself through training, coaching, and engaging projects with leading clients.We believe in collaborative learning, sharing knowledge, and uplifting one another. You will become part of a close-knit, diverse community of specialists who thrive on teamwork, brainstorming, and mutual support. Conflux is a place where your ideas matter, where you can make your voice heard, and where you can grow in your unique way.At Conflux, sustainable growth is our focus: technically, personally, and at your own pace. You will work on impactful Java projects, sharpen your technical knowledge, and develop within a robust community that actively participates in national and international events and conferences.

As a Front-End Developer, you will create interfaces that truly matter; they are not merely decorative but integral to the product itself.At Bluefront, you will build applications that are not just for show but are actively deployed, utilized, scalable, and reliable.Your role involves developing complex web applications, mobile apps, and portals where performance, user experience (UX), and maintainability are just as crucial as visual appeal.You will write precise code and understand the 'why' behind your coding decisions.Key Responsibilities:Design and develop front-ends using Angular and React, catering to both web and mobile platforms (including React Native).Utilize TypeScript, modern component architectures, and API-driven backends.Contribute to discussions about UX, performance, and technical choices.Debug issues, prevent new ones, and leave the codebase better than you found it.Share knowledge through code reviews, sessions, meet-ups, or casual conversations.We believe in collaboration, not silos.

As a Senior Data Scientist at Conflux, you will provide expert guidance to leading organizations on intricate analytical and AI challenges. Your role will blend in-depth model development with strategic consulting, enabling you to create production-ready models that translate business objectives into data-driven solutions. You will also mentor colleagues, fostering a collaborative mindset in your analytical approach.You are not just a "notebook-only" data scientist; you recognize that real impact comes from creating models that are scalable, interpretable, and maintainable. Your contributions will reflect considerations of data management, data ethics, and business adoption, going beyond mere model performance.At Conflux, we build predictive models, decision systems, and AI solutions that are actively utilized in production environments. Our team operates with a strong software engineering focus, setting high standards for quality, reproducibility, and technical depth. Knowledge sharing and thought leadership are at the heart of our culture. Each Friday, we host knowledge sessions, write blogs, present at conferences, and collaborate on innovative internal projects. You will spend approximately 90% of your time working on client projects, with the remaining time explicitly dedicated to innovation, research, or personal initiatives.Your Responsibilities:Designing and developing predictive models and AI solutionsTranslating business challenges into mathematical and statistical frameworksDeveloping end-to-end machine learning solutions from exploration to productionAdvising stakeholders on data-driven decision-makingImplementing MLOps principles for robust and scalable deploymentsGuiding and mentoring mid-level and junior data scientistsContributing to knowledge sharing, blogging, meetups, and conferences

As a Senior Data Engineer at Conflux, you will provide expert guidance to leading organizations in the Netherlands, tackling complex data challenges. Your role blends hands-on engineering with strategic consulting: you will write production-ready code, contribute to business decisions, and mentor colleagues to help them advance their skills.Your career has focused on the design and construction of data systems. You enjoy being involved in the technical aspects while never losing sight of quality, scalability, and sustainability. As an experienced Data Engineer, you operate on multiple levels and make significant contributions across the organization. You are ready for your next challenge.At Conflux, we develop data applications, build data platforms, create predictive models, and design robust data infrastructures. We approach our work with a strong software engineering mindset, emphasizing technical excellence.Knowledge sharing and thought leadership are central to our culture. Every Friday, we host knowledge sessions at the office, write blogs, organize meetups, and attend (and speak at) conferences.You will work on complex projects for prominent clients across various sectors, while being part of a small, informal, and close-knit team of professionals who challenge and inspire one another. At Conflux, you are the expert in the room while learning from your colleagues every day. Most importantly, you can truly be yourself here.Practically, you will spend approximately 90% of your time on client projects, with the remaining time explicitly dedicated to personal initiatives: a pet project, innovation, or an idea you wish to develop with your colleagues.

Join us as a Mid-Level Front-End Developer at Garansys and embark on an exciting journey! Engage in Dynamic Projects: Every client and application is unique, ensuring that no two days are alike! Continuous Learning and Growth: Enhance your front-end skills, explore back-end development, or delve into the (Azure) cloud. Become Part of a Skilled Team: Collaborate, learn together, and assist others in their growth.As a Mid-Level Front-End Developer at Garansys, you will leverage your extensive experience with contemporary web technologies and your passion for continuous self-improvement. You will collaborate with other full-stack developers on a diverse range of products for various clients.You have innovative ideas for optimizing the front-end of our applications and can anticipate user needs. You are well-versed in selecting the appropriate tools and frameworks for new assignments and possess a solid understanding of modern front-end architectures. The best solution is never a one-size-fits-all; it depends on the client's specific needs and requirements.You excel in both the visual aspects of your role and the development of interfaces with external systems and their corresponding back-ends. You create applications that are visually appealing and accessible to everyone, with performance always in mind.If you have the ambition, there is ample opportunity for you to develop both horizontally and vertically. You can explore new front-end frameworks or enhance your skills in back-end development or (Azure) Cloud technologies.Maarten Botter - Application Developer & Azure Team Lead: Discussions with the client team are crucial for ensuring we build the best solution. Sometimes I ask the questions; other times, I provide answers. This keeps us sharp.What We Value:As an experienced front-end developer, you should have a minimum of three years of experience with HTML5, CSS3, JavaScript/TypeScript, and Angular. Additionally, you should hold a completed HBO degree in Computer Science, Open ICT, Software Development, or a related field. You are a true team player who enjoys sharing knowledge with junior staff. Staying updated with the latest advancements in the field excites you, and you aspire to develop expertise in other frameworks such as React or Blazor. Opportunities for advancement to a senior or architect position are available. We also appreciate experience with:

Lead Architecture, Impact, and Content DirectionAs a Senior Fullstack Web Developer at Divotion, you will take the initiative in addressing complex web development challenges. You will assist organizations in creating scalable and future-proof front-end solutions, directly influencing architecture, code quality, and team development. Your deep technical expertise will be complemented by strong advisory skills for clients.Your RoleYou will work on strategic web development projects with leading clients, where performance, scalability, and maintainability are crucial. You will seamlessly switch between hands-on development and substantive advice, acting as a peer to developers, product owners, and technical decision-makers.What Will You Do?Design and implement enterprise-grade web architecturesDevelop complex front-end applications using Angular and/or ReactIntegrate front-end solutions with enterprise backends (e.g., Java or .NET)Work with TypeScript, modern state management, and build solutionsUtilize cloud platforms, Docker, and DevOps toolingAdvise on architectural choices, CI/CD, tooling, and best practicesConduct code reviews and mentor fellow developersCollaborate with backend, UX, and DevOps specialists at the architectural levelContribute to thought leadership within Divotion (knowledge sessions, blogs, events)RequirementsBachelor’s or Master’s degree in a relevant fieldAt least 5 years of experience as a Fullstack or Senior Web DeveloperIn-depth knowledge of Angular and/or ReactProven experience with at least one backend language (such as Java or .NET)Extensive experience with TypeScript and modern front-end architecturesStrong vision regarding quality, scalability, and maintainabilityExperience with cloud environments and modern deployment and CI/CD toolsExcellent communication skills and advisory capabilitiesFluency in Dutch is requiredBenefitsEngaging consultancy projects with visible impact for clientsSignificant autonomy and influence over technical and architectural decisionsOpportunities for professional development, coaching, and knowledge sharingPersonal soft-skills program with external guidanceFlexible employment conditions (salary, mobility, leasing, tools)A close-knit community of experienced specialists focused on craftsmanship

Join Conflux, a vibrant collective of IT boutiques dedicated to connecting people with the right specialists in the right places.Within our network, which includes esteemed brands like JDriven, Divotion, and BigData Republic, we have experts excelling in their fields. Daily, they tackle challenging consulting projects for leading organizations such as NS, Alliander, Port of Rotterdam, and ANWB. At Conflux, our brands collaborate in marketing, communication, recruitment, and sales, fostering growth and impactful results.As a Content Creator Intern at Conflux, you will directly contribute to the growth and positioning of our brand while gaining invaluable learning opportunities.Your Role:In this internship, you will create eye-catching and creative content, including social media posts, visuals, and videos. You will frequently attend events and create content on-site at our offices.Your task will involve translating technical narratives from developers and consultants into accessible and engaging content for a broader audience. Additionally, you will build a robust portfolio with published work across our channels.Your Responsibilities Include:On-site content creation: Conduct interviews with colleagues and capture content during events and in the office, including photography and behind-the-scenes footage;Developing social and creative formats: Create posts, visuals, and videos for platforms like LinkedIn, Reddit, and YouTube, engaging our target audience of IT professionals and the tech community. You'll work on employee stories, short-form videos, and write web content focusing on online visibility within AI search engines and newsletters to build and activate our fanbase;Moreover, you will collaborate on campaigns and optimizations, providing insights into effective content and campaigns, analyzing performance, and adapting to trends and new formats to continually enhance our offerings.

At Conflux, we empower organizations to tackle complex IT challenges by deploying the right IT consultants within projects and teams at enterprise organizations and government entities.As a Senior Account Manager in IT Staffing, you will play a pivotal role in cultivating new client relationships while expanding existing accounts. Your expertise will ensure that consultants are effectively deployed, fostering sustainable relationships with stakeholders.You will operate at the intersection of client relations, commerce, and service delivery, collaborating closely with recruitment teams and consultants.Your Responsibilities:As a Senior Account Manager, you will be tasked with developing projects and enhancing client relationships.Specifically:Developing new client relationships within enterprise and government sectors.Expanding existing accounts through upselling, cross-selling, and contract renewals.Assessing IT projects and technological challenges.Deploying IT consultants within client environments.Conducting commercial discussions with IT management and stakeholders.Realizing new assignments and expanding collaborations.Focusing on continuity, quality, and client satisfaction.Coordinating with recruitment regarding the availability and roles of consultants.

About UsAt ZeroTier, we are pioneering the future of connectivity and cybersecurity. Our innovative platform enables secure, peer-to-peer virtual networks that millions of users and organizations—from individual users and startups to large enterprises and Fortune 500 companies—trust for their connectivity needs. With support from notable investors such as Battery Ventures, Bonfire Ventures, and Anorak Ventures, we are continuously pushing the boundaries of what is possible in network technology.The RoleWe are in search of a highly skilled Senior Back-End Engineer who will play a crucial role in architecting and implementing core features of our distributed and cloud-based Central Management Portal. In this position, you will design and enhance our RESTful APIs using Go, and contribute to front-end development as needed. You will be an integral member of a dynamic engineering team focused on delivering high-quality features, making architectural decisions, and upholding security and coding best practices across our services. Clear documentation and effective communication with colleagues and stakeholders are essential to ensure reliable and comprehensive solutions that align with our business objectives.

At Conflux, we are a dynamic network of specialized IT boutiques dedicated to connecting people and deploying the right specialists in the right places. Our network includes esteemed brands such as JDriven, Divotion, and BigData Republic, where experts excel in their respective fields. They engage daily as consultants on challenging projects for leading organizations like NS, Alliander, and ANWB. At Conflux, these brands synergize in marketing, communication, recruitment, and sales, allowing us to grow and create impactful solutions together.As a Marketing and Communication Intern at Conflux, you will play a crucial role in driving the growth and positioning of our brand. You will have numerous opportunities to learn and truly make an impact within our organization.Your responsibilities will include:Assisting in the brand positioning and visibility of Conflux, contributing to employer branding within tech communities.Analyzing content and channels (LinkedIn, website, newsletters), identifying improvement opportunities, and collaborating on the right strategies and optimizations.Enhancing visibility through events, meetups, and conferences, and assisting in their organization.Making marketing results transparent, analyzing and optimizing them, and contributing to the automation of processes (e.g., via HubSpot).Conducting audience and market research, testing new channels, and translating insights into campaigns and marketing strategy.

Join Learned, where we empower organizations to cultivate their workforce effectively. Our advanced HR platform revolutionizes traditional HR practices, placing performance, development, and feedback at the forefront. Trusted by hundreds of companies, from dynamic startups to established enterprises, our software is critical to their growth. As we continue to expand rapidly, we're on the lookout for a passionate Senior Full Stack Developer. If you aspire to grow into a lead role, this could be the perfect opportunity for you!Note: Applicants must already reside in the Netherlands and be able to work in our Utrecht office three days a week.Your Role – Making an ImpactAs a Senior Full Stack Developer, you will lead the design, development, and maintenance of our SaaS platform. Engage with the entire technology stack, creating user-friendly interfaces with React and robust APIs and back-end services using Node.js. Collaborate with product managers, UX designers, and fellow engineers to deliver features that delight our customers.In an average week, you will:Collaborate with product and design teams to define and craft new features that enhance user experience.Participate in four weekly sprints with your team.Write clean, scalable, and maintainable code using modern TypeScript, React, Node.js, and MongoDB.Design and implement efficient and secure REST APIs to power our platform.Lead technical design discussions and contribute to architectural decisions.Review code, mentor junior developers, and uphold high engineering standards.Enhance developer workflows, CI/CD processes, and automated testing.Own projects from planning through deployment, ensuring timely and high-quality delivery.

Join Our Team as a Fullstack Developer!About LegionellaDossierAt LegionellaDossier, we are dedicated to revolutionizing water safety for businesses. Our innovative platform empowers organizations to efficiently manage water safety, maintain compliance, and optimize workflows, ensuring the safety of individuals and the smooth operation of businesses.We are excited to embark on a transformative journey, completely overhauling our platform to adopt a modern, scalable architecture using Node.js and React Native. To achieve this vision, we are seeking a talented Fullstack Developer who is eager to contribute to the future of water safety software.Your RoleAs part of our dynamic development team, you'll play a key role in crafting the next iteration of our product, ranging from backend microservices to mobile applications. You don’t need to be a master in every technology; if you excel in Node.js or React Native and are keen to expand your skill set, we welcome your application!In this role, you will collaborate closely with product and design teams to translate ideas into functional, user-friendly features.Your MissionEnhance and expand our Node.js microservices platform.Create engaging mobile experiences utilizing React Native.Contribute to architecture and API design discussions.Produce clean, maintainable, and thoroughly tested code.Provide insights to improve performance, developer experience, and code quality.Investigate and implement AI-assisted development tools to boost productivity.

Are you a passionate PHP Developer who thrives on building scalable back-end systems and applications that make a real impact? Join us in shaping the future of mobility for over a million travelers. Your code will not only function but will significantly enhance the user experience. We are in the midst of a transformation—from silos to domains, from on-premises to cloud solutions. This means you won’t just follow a routine; you’ll actively participate in creating the future. Every day brings new challenges, and that’s what makes it exciting.Do you want to work for an inclusive and dynamic organization where you can truly make a difference? At Mobility Invest Group, we focus on collaboration, reliability, and continuous improvement. You’ll be part of a rapidly growing company where your ideas are valued, and you have the opportunity to learn and make an impact—whether you’re experienced or just starting out. We are a recognized inclusive employer in Amersfoort: everyone is welcome, regardless of background.What We Offer You!A competitive salary ranging from €4,000 to €6,000 gross per month (based on a 40-hour week), depending on your knowledge and experience;Daily catered lunch, a café on-site with weekly social events, fun team outings, and employee parties;A pleasant working environment within walking distance from the center and train station of Amersfoort;Focus on workplace vitality: chair massages, a football and padel team, and much more;Additional great employment benefits, such as a premium-free pension, a business public transport card (second class), bicycle allowance, and a training budget for your continuous development;An open work environment where teamwork, humor, and mutual support are natural;A trust-based work approach: you have a lot of flexibility and opportunities to work from home;An informal organization where you feel welcome. We believe that the strength of diversity and inclusivity enhances the quality of our work.What Will You Do?Develop scalable and secure back-end services in PHP (utilizing modern patterns and libraries);Collaborate in domain-oriented teams that take responsibility from idea to production;Engage in innovative projects that drive the future of travel;Contribute to agile development practices and continuous integration processes.

Join Our Team as a Frontend EngineerAt Channable, we are looking for a talented Frontend Engineer to become an integral part of our Website Team. In this role, you will take charge of developing and enhancing our public-facing web platform. Your main objective will be to create, optimize, and expand a dynamic marketing website that effectively communicates our value proposition and converts visitors into loyal customers.You will work closely with Product Marketing, Design, and Growth teams to prototype and deliver new website features that align with user insights and business goals. From concept to launch, your contributions will ensure a seamless user experience across our digital presence.Key ResponsibilitiesTransform business and marketing objectives into high-impact, user-centric website experiences that function optimally across various devices and drive measurable growth.Assess functional requirements critically and suggest enhancements that improve usability and conversion rates.Develop scalable, maintainable, and well-tested frontend code, with a strong focus on performance and quality assurance.Translate wireframes and design concepts into a refined UI while following and advancing our design system.Manage technical SEO best practices, including semantic HTML/Markdown, structured content, Core Web Vitals, and page speed optimization, while shaping and maintaining CMS schemas for structured content.Stay well-informed about UX and interaction principles, especially in the context of marketing websites (conversion flows, landing pages, performance enhancement).Collaborate effectively with designers, marketers, and engineers to deliver cohesive user experiences.Contribute to frontend standards and support cross-team initiatives where website and product experiences intersect.Our Technology Stack:Frontend: TypeScript, React, Next.js, Apollo, CSS-in-JS, Jest, REST, Webpack, Babel, ESLintOther Technologies: Hygraph, Vercel, Haskell, Python, PostgreSQL, Redis

Strix is an international company with a diverse team of over 250 specialists based in Poland, Germany, and the Netherlands. Our organization offers the stability of a well-established company combined with the freedom to influence technological decisions and project directions.At Strix, we develop enterprise-level e-commerce solutions, creating fast, scalable, and innovative platforms that cater to millions of users each month. As a Platinum Shopware Partner and trusted collaborator of Magento and Shopify, we assist global brands in developing solutions that set new market standards.Your Role:Transform design models into pixel-perfect templates, implementing UI designs using HTML, CSS, and JavaScript.Create components and interactive elements utilizing Vue.js, Twig, and Bootstrap (or similar).Experience with e-commerce platforms like Magento and Shopware is a plus.Employ preprocessors such as LESS or SASS for styling.Propose improvements to UX/UI and optimize template performance.Participate in project planning, coordinate with clients, and attend meetings to understand requirements.Guide projects from inception to completion: setup → implementation → testing → deployment.

Join us as a Senior Backend Developer!Are you a skilled backend developer eager to make a significant impact in a rapidly growing and innovative organization? FinancialLease.nl is seeking a passionate Senior Backend Developer to strengthen our Digital Innovations team and contribute to building robust and scalable solutions!About UsAt FinancialLease.nl, we go beyond leasing; we create intelligent digital solutions that simplify complexity. Our Digital Innovations team plays a central role in developing scalable, secure, and user-friendly systems that support the entire organization. We work with a modern tech stack, including C#, ASP.NET Core, TypeScript, React, React Native, and Next.js.We believe in choosing the right tools for the right challenges and prioritize clean, maintainable, and scalable code over quick, temporary fixes. Our engineers are valued partners within the business, directly contributing to the success of our services.Your RoleAs a Senior Backend Developer, you will be responsible for the development and maintenance of our backend systems and APIs. You will collaborate closely with the engineering team to build new features, enhance performance, and ensure the quality of our codebase. This is a hands-on role where you will work across the entire backend stack and actively influence technical decisions.You will join a team that prioritizes quality and structure, striving for sustainable solutions that are well-founded from the ground up.

We are seeking a talented and experienced Senior Full-Stack Developer to join our dynamic team at SanaCommerce. In this role, you will be responsible for designing, developing, and maintaining innovative web applications that enhance our customers’ experiences. You will work closely with cross-functional teams to deliver high-quality software solutions that meet business needs.

As a Senior Test Automation Engineer at Conflux Consulting, you will ensure that software not only functions correctly but is also demonstrably reliable, scalable, and maintainable. You will operate at the intersection of development, quality engineering, and DevOps.More than just a tester, you are a quality engineer with a strong technical foundation. You will design test strategies, build robust test automation frameworks, and advise clients on quality assurance within modern software architectures. Your work will take place in complex enterprise environments where CI/CD, cloud, and microservices are standard. Additionally, you will serve as a knowledgeable partner to developers, architects, and stakeholders.You will spend approximately 80-90% of your time on client projects, while the remaining time will be dedicated to knowledge sharing, innovation, and advancing the Test Automation practice within Conflux.What will you do?Design and implement test automation frameworksEstablish and optimize CI/CD test integrationsSet up test strategies within Agile/DevOps environmentsAutomate API, UI, and integration testsAdvise on quality architecture and shift-left testingGuide teams in test automation and quality engineeringContribute to knowledge sharing and practice development