Senior Software Engineer (Node.js/React) - Digital Mental Health

ZartisEuropean Union

On-site Full-time

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Experience Level

Senior

Qualifications

Qualifications: - Proven experience with Node.js and React frameworks.- Strong understanding of software architecture and design principles.- Familiarity with CI/CD processes and automated testing frameworks.- Excellent problem-solving skills and a collaborative mindset.

About the job

About Us:

Zartis is a leading digital solutions provider specializing in technology strategy, software engineering, and product development. We collaborate with companies across various sectors including financial services, MedTech, media, logistics technology, renewable energy, EdTech, and e-commerce.

Our engineering hubs in EMEA and LATAM are populated by skilled professionals dedicated to driving business success and enhancing digital capabilities through application development, software architecture, CI/CD, business intelligence, QA automation, and technology integrations.

Role Overview:

We are seeking a passionate Senior Software Engineer to join our team and contribute to a transformative project in the digital mental health sector. This role involves working with a diverse group of talented individuals committed to fostering an inclusive culture rooted in trust and innovation.

As part of a distributed team, you will help revolutionize mental health care by developing the UK’s largest platform designed to support and empower young people in managing their mental well-being. You will play a key role in determining the technical direction and building robust, scalable systems that guide users to the assistance they need.

Key Responsibilities:

- Design, implement, and manage a range of Node.js backend services, React-based web applications, and React Native mobile experiences that form the foundation of our platform.

- Take complete ownership of features from conception to deployment, demonstrating accountability and a customer-focused impact.

- Ensure the longevity of a legacy platform through proactive maintenance, strategic enhancements, and high-quality technical support.

- Engage in system design and architectural improvements.

- Champion best practices in trunk-based development, automated testing, CI/CD, and infrastructure as code.

- Take charge of system performance, resilience, observability, maintainability, security, and accessibility.

- Collaborate across disciplines and mentor peers through pair programming, code reviews, and knowledge sharing.

About Zartis

Zartis stands at the forefront of digital innovation, partnering with organizations to provide strategic technology solutions that drive growth and efficiency across various industries. Our talented teams are committed to making a positive impact through cutting-edge software engineering and product development.

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Senior Fullstack Engineer (Java, Vue) at Zartis | European Union

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Senior Backend Engineer (Node.js) at Playson | European Union

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Join Playson - a premier online gaming supplier recognized globally since our inception in 2012. As part of our dedicated promotional features team, we are looking for a Senior Backend Engineer with extensive expertise in Node.js. This pivotal position focuses on the development and enhancement of promotional features for our innovative gaming platforms, prioritizing performance, scalability, and state-of-the-art solutions.If you're passionate about product development, excel at tackling complex technical challenges, and possess a rapid 'Proof of Concept' mindset coupled with a strong sense of ownership, we want to hear from you!

Jun 23, 2025

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Senior Product Designer at lemlist | European Union

lemlist

Full-time|On-site|European union

About us At lemlist, we revolutionize sales engagement, empowering teams with unrivaled tools to achieve their goals. Since our inception, we've grown organically to reach a remarkable $35M ARR in just six years, without external funding. Today, we stand as a profitable B2B SaaS company valued at $150M, serving over 40,000 sales teams around the globe to enhance their meeting bookings and close more deals.As a Senior Product Designer, you'll collaborate closely with Senior Product Managers and Developers across our teams to create impactful solutions for our users. You'll take ownership of the design process from problem identification to product launch, contributing to the future of sales technology.Your responsibilities will include:Gaining a profound understanding of our market, users, and product visionInvestigating underlying issues and opportunitiesLeading the design delivery process with Product Managers from discovery to launch, ensuring user satisfaction and impactIdentifying challenges, proposing enhancements, and influencing the product roadmapEnsuring product quality by promoting consistency, simplicity, and usabilityCrafting exceptional design experiences that establish lemlist as a leader in the marketWorking efficiently, adapting quickly, and learning continuously, whether in a team or directly with usersManaging multiple design opportunities simultaneouslyContributing to the future landscape of Product Design and Sales, including AI integrationEvolving your role to maximize the value you can provideWhat we’re not looking for:Designers who only deliver Figma filesThose who wait for instructions rather than taking initiativeIndividuals uncomfortable with user engagement or value-driven designDesigners who do not prioritize user impactThose who prefer their comfort zoneIndividuals who spend more time on processes than on delivering user value

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Senior Legal Counsel at Playson | European Union

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Full-time|Hybrid|European Union

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Dec 17, 2025

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Senior Game Mathematician at Playson | European Union

Playson

Full-time|On-site|European Union

Playson is a premier online gaming provider recognized globally, established in 2012. We deliver comprehensive gaming solutions leveraging cutting-edge technology and thorough market analysis tailored for leading iGaming operators.Our mission:To enhance entertainment and satisfaction in the fast-paced world.Role Overview:With a focus on growth and scalability, we are thrilled to welcome accomplished Mathematicians to join our Game Development team. The selected candidate will collaborate with Product Owners and fellow Mathematicians, contributing significantly to our organizational objectives.Key Qualifications: Minimum of 3 years’ experience as a game mathematician within the online gambling sector. Proficiency in scripting languages, preferably TypeScript or JavaScript. Strong grasp of essential programming paradigms. Exceptional ability to tackle complex and abstract mathematical problems. Meticulous attention to detail, with the capability to identify minor errors in mathematical models and rectify them. Passion for slot games from both a developer's and player's perspective. Aptitude for swiftly prototyping initial ideas. Basic knowledge of HTTP client-server interactions. Analytical and data-driven approach to decision-making. Driven by challenges and ambitious objectives. Proficient in spoken and written English.Preferred Skills: Strong mathematical intuition, creativity, and curiosity. Perspective to analyze games from a player's viewpoint. Familiarity with project management tools (Jira) and collaboration platforms (Confluence).Responsibilities: Craft innovative game mathematics and mechanics in partnership with Product Owners and cross-functional teams. Refine game mathematics and mechanics, ensuring optimal product quality. Conduct simulations of game math to assess alignment with desired outcomes and other games in our portfolio.

Mar 2, 2026

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Senior Software Engineer (Scala) - Green Energy Project

Zartis

Full-time|On-site|European Union

Join Zartis as a Senior Software Engineer focused on green energy solutions:At Zartis, we are dedicated to delivering cutting-edge digital solutions across various sectors, including financial services, MedTech, media, logistics, renewable energy, EdTech, and e-commerce.As a part of our dynamic engineering teams located in EMEA and LATAM, you will collaborate with talented professionals to enhance application development, software architecture, CI/CD, business intelligence, QA automation, and technology integrations.In this role, you will join the API Platform team, where you will develop and maintain crucial components of a retail energy platform. Your responsibilities will include creating a high-performance GraphQL API and an event gateway to ensure efficient, low-latency data access for our global clients in the energy sector.We value collaboration and encourage an inclusive culture where teamwork thrives. You will engage in agile practices, address complex challenges, and utilize Infrastructure as Code (IaC) for managing Kubernetes deployments.

Feb 13, 2026

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Senior Software Engineer (Node.js/React) - Digital Mental Health

Zartis

Full-time|On-site|European Union

About Us:Zartis is a leading digital solutions provider specializing in technology strategy, software engineering, and product development. We collaborate with companies across various sectors including financial services, MedTech, media, logistics technology, renewable energy, EdTech, and e-commerce. Our engineering hubs in EMEA and LATAM are populated by skilled professionals dedicated to driving business success and enhancing digital capabilities through application development, software architecture, CI/CD, business intelligence, QA automation, and technology integrations. Role Overview: We are seeking a passionate Senior Software Engineer to join our team and contribute to a transformative project in the digital mental health sector. This role involves working with a diverse group of talented individuals committed to fostering an inclusive culture rooted in trust and innovation. As part of a distributed team, you will help revolutionize mental health care by developing the UK’s largest platform designed to support and empower young people in managing their mental well-being. You will play a key role in determining the technical direction and building robust, scalable systems that guide users to the assistance they need. Key Responsibilities: - Design, implement, and manage a range of Node.js backend services, React-based web applications, and React Native mobile experiences that form the foundation of our platform.- Take complete ownership of features from conception to deployment, demonstrating accountability and a customer-focused impact.- Ensure the longevity of a legacy platform through proactive maintenance, strategic enhancements, and high-quality technical support.- Engage in system design and architectural improvements.- Champion best practices in trunk-based development, automated testing, CI/CD, and infrastructure as code.- Take charge of system performance, resilience, observability, maintainability, security, and accessibility.- Collaborate across disciplines and mentor peers through pair programming, code reviews, and knowledge sharing.

Apr 7, 2026

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Senior Product Marketing Manager - Core

Castai Group Inc.

Full-time|On-site|European Union

Role Overview Castai Group Inc. is looking for a Senior Product Marketing Manager - Core based in the European Union. This role shapes product marketing strategy and works closely with cross-functional teams to define product positioning, messaging, and go-to-market plans. The position focuses on connecting with target audiences and supporting product direction to help reach more of the market.

Apr 20, 2026

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