Senior / Lead Full Stack Developer (.NET/React)

About GapstarsGapstars is a leading software development services provider headquartered in the Netherlands, specializing in creating innovative, agile remote teams in Sri Lanka and Portugal. Our mission is to empower ambitious tech companies with top talent, transforming scalable software into high-performance products that are set to redefine the industry landscape.About the RoleAs a Full Stack Developer, you will play a pivotal role in enhancing our internal tools and applications. Your primary focus will be to elevate user experience while ensuring we consistently deliver impactful results. Our commitment to leveraging cutting-edge technology enables us to continually iterate and enhance features, aiming for nothing short of excellence.Key Responsibilities1. Development & MaintenanceDesign, develop, and maintain internal tools and applications, including web scraping systems.Create scalable solutions for data collection and processing from diverse sources.Engage throughout the product lifecycle: from design and development to testing and deployment.2. Production Reliability & Incident ManagementProactively investigate and resolve complex production issues from start to finish.Debug across backend systems, databases, infrastructure, and integrations.Address problems directly in the codebase, ensuring sustainable solutions.Enhance monitoring, logging, and observability for better performance.3. System Enhancements at ScaleIdentify and address performance bottlenecks and scalability challenges.Optimize APIs, queries, and workflows for improved efficiency.Enhance automation systems, including email, integrations, and scraping tools.Minimize technical debt through structural improvements.

About Gapstars Gapstars partners with leading tech companies across Europe, supporting both startups and scaleups as they build remote engineering teams that deliver real results. Headquartered in the Netherlands, with talent hubs in Sri Lanka and Portugal, Gapstars employs more than 300 engineers. Teams work on projects spanning networking, marketplaces, SaaS, and AI, always focused on practical solutions to real-world problems. The company places a strong emphasis on technical skill, a supportive culture, and opportunities for personal development. Gapstars aims to be a place where engineers can grow and make an impact.

Join Our Team at GapstarsAt Gapstars, we collaborate with some of Europe’s most forward-thinking tech companies, ranging from innovative startups to rapidly growing scale-ups, to assemble high-performing remote engineering teams.Our headquarters are in the Netherlands, with talent hubs located in Sri Lanka and Portugal, housing over 300 engineers passionate about tackling real-world challenges using cutting-edge technologies. Our teams operate across various domains, including networking, marketplaces, SaaS, and AI, delivering scalable solutions that yield impactful results.If you seek an organization that values technical excellence, fosters a supportive culture, and encourages professional growth, look no further than Gapstars.

Join Gapstars as a Senior Software Engineer / Associate Technical Lead!At Gapstars, we collaborate with some of Europe's most innovative tech companies, from groundbreaking startups to rapidly growing scaleups, to assemble high-performance remote engineering teams.With our headquarters located in the Netherlands and talent hubs in Sri Lanka and Portugal, we boast over 275 engineers who are passionate about tackling real-world challenges using state-of-the-art technologies. Our teams engage in a wide array of domains, including networking, marketplaces, SaaS, and AI, delivering scalable solutions that yield impactful results.If you are seeking a workplace that values technical excellence, fosters a strong culture, and provides ample opportunities for personal and professional growth, look no further than Gapstars.Role OverviewAre you a talented Full Stack Engineer excited to develop pioneering AI-driven applications in the healthcare sector? Do you excel in environments that push you to create scalable and high-performing software solutions? If yes, we would love to hear from you!Your OpportunityIn your role as a Full Stack Engineer with a strong focus on back-end development, you will be responsible for designing, developing, and deploying scalable applications that power our AI-driven solutions. Collaborating closely with engineers, designers, and product teams, you will ensure that both front-end and back-end systems are optimized for performance and reliability.Key ResponsibilitiesDevelop front-end components utilizing modern JavaScript frameworks such as React.Design, build, and enhance scalable backend services using Python frameworks (Flask, FastAPI, or Django).Implement and optimize RESTful APIs, ensuring seamless integration with front-end components.Design and optimize databases for performance and scalability, particularly using PostgreSQL.Automate CI/CD pipelines and manage AWS cloud deployments.Engage in code reviews and apply best practices for software development.Diagnose and resolve production issues to ensure system reliability.Collaborate with cross-functional teams to translate business requirements into technical specifications.

Gapstars, headquartered in the Netherlands, builds agile software teams in Sri Lanka and Portugal for scaling tech companies. With a team of over 300 technology professionals, Gapstars delivers high-performance products by focusing on collaboration and innovation throughout every project. Role overview The Technical Lead - PHP/React.js will play a central role in designing, developing, and maintaining product features. This position blends hands-on coding with responsibility for code quality and process improvement. Working within agile, cross-functional teams, the Technical Lead guides engineers from concept to deployment, ensuring solutions are reliable, scalable, and easy to maintain. Key responsibilities Feature ownership and delivery Lead features from initial design through production release and ongoing maintenance. Translate functional and technical requirements into scalable solutions. Deliver features on schedule while meeting internal quality standards. Work closely with Product Owners, designers, and engineers at every stage. Full-stack development Develop backend features with Laravel and frontend features with Next.js as needed. Write clean, reusable code in PHP and TypeScript. Adhere to architectural guidelines and contribute to technical improvements. Support system integrations to ensure smooth communication between components. Quality and reliability Create and maintain unit and integration tests to support quality goals. Monitor and improve performance of existing features. This role is based in Colombo, Western Province, Sri Lanka, and is ideal for those who enjoy both technical leadership and hands-on development across PHP and React.js stacks.

Join Gapstars as a Technical Lead in Backend DevelopmentAt Gapstars, we collaborate with some of Europe’s most ambitious tech companies, from innovative startups to rapidly growing scale-ups, to build high-performing remote engineering teams.Headquartered in the Netherlands and with talent hubs in Sri Lanka and Portugal, we are proud to have over 275 engineers dedicated to solving real-world challenges using cutting-edge technologies. Our teams span various domains, including networking, marketplaces, SaaS, and AI, delivering scalable solutions that create significant outcomes.If you seek a company that values technical expertise, fosters a strong culture, and offers growth opportunities, consider Gapstars your next home.Role OverviewAre you a talented Full Stack Engineer excited to work on groundbreaking AI-driven applications within the healthcare sector? If you thrive in a challenging environment where you can construct scalable and high-performance software solutions, this position is perfect for you!Key ResponsibilitiesDesign, develop, and optimize scalable backend services using Python frameworks such as Flask, FastAPI, or Django.Create front-end components utilizing modern JavaScript frameworks like React.Implement and enhance RESTful APIs to ensure seamless integration with front-end components.Design and optimize databases for performance and scalability, particularly with PostgreSQL.Automate CI/CD pipelines and manage AWS cloud deployments.Engage in code reviews and enforce development best practices.Diagnose and resolve production issues to maintain system reliability.Collaborate with cross-functional teams to translate business requirements into innovative technical solutions.

About GapstarsGapstars is a leading software development services provider based in the Netherlands, dedicated to building innovative remote teams in Sri Lanka and Portugal for forward-thinking tech companies. With over 300 talented TechStars on board, we are committed to transforming scalable software into high-performance products that drive the future. We partner with ambitious tech companies eager to conquer their markets.About the RoleWe are seeking an experienced Front-End Developer to take the lead in crafting modern, high-performance, and maintainable web application interfaces. You will leverage your expertise in React, TypeScript, and Tailwind CSS to create scalable UI components and features. This position requires a keen focus on user experience, client-side performance optimization, and effective integration with back-end services.Key ResponsibilitiesDesign and develop responsive, reusable UI components utilizing React, TypeScript, and Tailwind CSSImplement effective data fetching strategies using TanStack QueryManage client-side state with ZustandEnhance client-side performance and optimize page load speedCollaborate closely with back-end engineers, designers, and product managersEnsure UI accessibility, responsiveness, and compatibility across various browsersWrite clean, maintainable code adhering to modern front-end best practicesEngage in code reviews and contribute to front-end architectural decisions

About GapstarsAt Gapstars, we collaborate with some of Europe’s most innovative tech enterprises, ranging from disruptive startups to rapidly expanding scaleups. Our mission is to aid them in constructing high-performing remote engineering teams.With headquarters in the Netherlands and talent hubs in Sri Lanka and Portugal, we boast a workforce of over 275 engineers dedicated to solving real-world problems through cutting-edge technologies. Our teams operate in various sectors, including networking, marketplaces, SaaS, and AI, delivering scalable solutions that lead to impactful results.If you seek a workplace that values technical excellence, fosters a strong culture, and offers ample opportunities for growth, Gapstars is the right place for you.About the RoleAre you an experienced Full Stack Engineer passionate about developing innovative AI-driven applications in the healthcare sector? Do you excel in dynamic environments that challenge you to create scalable and high-performance software solutions? If so, this opportunity is tailored for you!The OpportunityAs a seasoned Full Stack Engineer, you will engage in the design, development, and deployment of scalable applications that support AI-driven solutions. Collaborating closely with engineers, designers, and product teams, you will optimize both front-end and back-end systems for peak performance and reliability.Key ResponsibilitiesDevelop front-end components using contemporary JavaScript frameworks such as React.Design, construct, and enhance scalable back-end services utilizing Python (Flask, FastAPI, or Django).Implement and refine RESTful APIs to ensure seamless integration with front-end components.Design and optimize databases for performance and scalability, primarily using PostgreSQL.Automate CI/CD pipelines and manage AWS cloud deployments.Participate in code reviews and advocate for development best practices.Troubleshoot and resolve production issues, ensuring system reliability.Collaborate with cross-functional teams to translate business requirements into technical solutions.

About GapstarsGapstars, a premier software development services provider located in the Netherlands, specializes in creating remote, agile teams in Sri Lanka and Portugal for pioneering technology firms. With over 300 talented TechStars and innovative professionals, we transform scalable software into high-performance products that drive the future. Our partners include ambitious tech companies eager to dominate their markets.About the RoleWe are seeking a Front-End Developer who will be instrumental in crafting modern, efficient, and sustainable web application interfaces. This role demands extensive collaboration with React, TypeScript, and Tailwind CSS to build scalable UI components and functionalities. A keen focus on user experience, client-side performance enhancement, and seamless backend integration is essential.Key ResponsibilitiesDesign and implement responsive, reusable UI components using React, TypeScript, and Tailwind CSSDevelop effective data fetching methodologies utilizing TanStack QueryOversee client-side state management employing ZustandEnhance client-side performance and optimize page load timesCollaborate closely with back-end engineers, designers, and product managersGuarantee UI accessibility, responsiveness, and cross-browser compatibilityProduce clean, maintainable code that adheres to modern front-end best practicesEngage in code reviews and contribute to the architectural decisions of the front-end

About GapstarsGapstars collaborates with some of Europe's most innovative tech companies, ranging from pioneering startups to rapidly growing scaleups, to create high-performing remote engineering teams. With our headquarters in the Netherlands and talent hubs located in Sri Lanka and Portugal, we boast a vibrant community of over 275 engineers dedicated to tackling real-world challenges using cutting-edge technologies. Our diverse teams specialize in various domains, including networking, marketplaces, SaaS, and AI, providing scalable solutions that yield impactful results. If you seek an organization that embodies technical excellence, a strong culture, and opportunities for growth, Gapstars is the place for you.The RoleWe are in search of a Senior Java Software Engineer who possesses robust backend engineering expertise to assist in the design, construction, and evolution of scalable backend systems. This position demands a senior-level engineer capable of contributing throughout the entire development lifecycle, from architecture and high-level design to implementation, code quality, and collaboration with cross-functional teams.The ideal applicant will demonstrate substantial proficiency in Java, Spring Boot, and microservices architecture, along with strong system design skills and exceptional communication abilities. Experience with event-driven architecture is advantageous, but not a disqualifying factor at this level. A solid foundation in architecture and design in general is adequate.Core ResponsibilitiesLeadership and Technical OwnershipAssume responsibility for technical delivery from design through to implementation.Contribute to high-level solution design and translate requirements into scalable backend solutions.Mentor junior and mid-level engineers and enhance overall team capabilities.Champion engineering quality through code reviews, adherence to clean coding practices, and sound design principles.Engineering and DeliveryDesign, develop, and improve backend applications utilizing Java and Spring Boot.Construct and sustain robust microservices-based systems.Engage in architectural discussions and implementation decisions.Lead incident analysis, root cause investigations, and preventive measures.Ensure all solutions adhere to expected standards for quality, performance, and maintainability.Collaboration and Continuous ImprovementWork in close partnership with Product Owners, Team Leads, Architects, and Engineers.Assist in refinement sessions and help shape technically sound solutions.Encourage collaboration, knowledge sharing, and continuous improvement within the team.

Gapstars, a software development services company with headquarters in the Netherlands, brings together more than 300 technology professionals across Sri Lanka and Portugal. The company partners with ambitious tech businesses, providing agile remote engineering teams focused on building scalable, high-performance software products. Role overview The Technical Lead - Node/React will play a central role in guiding the development of modern web platforms within a cross-functional team in Colombo. This position centers on leading key components of the platform, fostering both technical quality and the professional growth of team members. The role suits those who enjoy building large-scale SaaS applications and value continuous learning. What you will do Lead the design and development of essential platform features using Node.js and React Mentor and support a development team, promoting best practices in code quality, security, and scalability Work closely with partners and internal stakeholders to deliver solutions with significant impact Keep up with industry trends and contribute to technical decisions Requirements Experience building large-scale SaaS applications Previous background in leading development teams Strong understanding of code quality, security, and scalable architecture Motivation for ongoing personal and professional development Location This role is based in Colombo, Western Province, Sri Lanka.

Role OverviewWe are seeking a Senior Technical Lead to spearhead the engineering delivery and define the technical vision for our innovative product/platform. You will be responsible for making architectural decisions, mentoring a team of engineers, ensuring quality releases, and collaborating closely with Product Management, Quality Assurance, and DevOps teams to create scalable, secure, and maintainable solutions.

Role Overview ifs1 is hiring a Senior Site Reliability Engineer in Colombo. This position focuses on keeping systems reliable, scalable, and high-performing. The role involves close collaboration with teams across the company to design, implement, and maintain infrastructure solutions that support business needs. What You Will Do Work with cross-functional teams to build and maintain infrastructure Monitor and improve system reliability and scalability Support performance goals for core systems Location This position is based in Colombo.

About GapstarsGapstars is an innovative software development services company based in the Netherlands, dedicated to creating remote, agile teams in Sri Lanka and Portugal. With a talented workforce of over 300 Tech Stars, we are committed to transforming scalable software into high-performance products that drive the future of technology. Our partners include ambitious tech companies aiming to excel in their respective markets.The RoleAt Gapstars, we strive to empower dynamic tech companies with top-tier technical talent. We are on the lookout for a Technical Lead who is passionate about modern web platform development and has a strong desire for personal and professional growth. As a key member of a cross-functional team, you will play a significant role in leading the development of essential components of our platform. The ideal candidate should have substantial experience in creating large-scale SaaS applications and guiding development teams while upholding best practices in code quality, security, and scalability.

Join our dynamic R&D team as a Senior Lead Software Engineer (.NET, C#) at Acumatica! In this pivotal role, you will collaborate with a talented team of developers to design, create, and maintain large-scale, cloud-based ERP, CRM, and web applications utilizing Microsoft technologies such as .NET, C#, and MS SQL Server for businesses across the globe.Engage in the architecture, development, and customization of business applications.Create robust data access layers, business objects, and presentation layers.Innovate and develop modular enterprise-grade software solutions.Provide support for legacy code, focusing on optimization and refactoring.Conduct thorough code analysis to identify and resolve functionality errors.Collaborate with development partners on architecture and code review processes.Mentor and guide developers within Acumatica’s development network while promoting the Acumatica ERP framework.

About GapstarsGapstars, a premier software development services provider based in the Netherlands, excels in assembling remote agile teams in Sri Lanka and Portugal for forward-thinking tech companies. With a vibrant community of over 300 TechStars and innovative professionals, we transform scalable software into high-performance products that pave the way for the future. Our partners are ambitious tech enterprises striving to dominate their markets.The RoleAt Gapstars, we are dedicated to driving growth for ambitious tech companies by harnessing exceptional tech talent. We are seeking a seasoned and driven engineer with robust programming fundamentals and adaptability to new frameworks. As an Associate Technical Lead, you will design, develop, and deploy user-facing features while ensuring our product maintains its high-quality standards to meet the needs of millions of users.

About GapstarsGapstars collaborates with Europe's most innovative tech companies, ranging from disruptive startups to rapidly growing scaleups, to create high-performing remote engineering teams.With our headquarters in the Netherlands and talent hubs located in Sri Lanka and Portugal, we are proud to employ over 275 engineers dedicated to addressing real-world challenges through cutting-edge technologies. Our teams excel in various domains, including networking, marketplaces, SaaS, and AI, delivering scalable solutions that yield impactful results.If you are seeking an organization that values technical excellence, fosters a strong culture, and provides ample opportunities for growth, welcome to Gapstars.About the RoleAre you a highly proficient Full Stack Engineer excited about developing innovative AI-driven applications within the healthcare sector? Do you excel in an environment that pushes you to create scalable and high-performance software solutions? If this resonates with you, we invite you to apply!In this role, you will be instrumental in building and maintaining our AI-powered platforms, ensuring seamless integration between front-end and back-end services. You will collaborate closely with engineers, designers, and product teams to deliver groundbreaking solutions that enhance our healthcare applications.Develop and maintain front-end applications utilizing modern JavaScript frameworks such as React, Vue, or Angular.Design, implement, and optimize scalable backend services using Python frameworks like FastAPI, Flask, or Django.Create and integrate RESTful APIs to support AI-driven applications.Optimize databases for performance and scalability using SQL.Implement and manage CI/CD pipelines to streamline software deployment.Troubleshoot and debug issues across the stack, ensuring high system reliability.Engage in code reviews and promote best coding practices.Work collaboratively with cross-functional teams to translate business requirements into technical solutions.

Gapstars specializes in software development services, with headquarters in the Netherlands and remote teams based in Sri Lanka and Portugal. The company works with technology partners aiming to stand out in their fields, delivering scalable software and high-performance products through a team of more than 300 professionals. Role overview The Technical Lead - Generative AI role focuses on combining solid software engineering with the evolving landscape of applied AI. This position involves designing, building, and assessing AI systems that go beyond prototypes to deliver measurable value. What you will do Design and develop AI solutions that prioritize reliability, clear measurement, and real-world application. Collaborate with data scientists, software engineers, and product managers to create effective AI products. Evaluate AI technologies carefully, focusing on substance rather than trends. Promote automation where it leads to better outcomes. Help build straightforward, efficient systems, with a particular emphasis on the life sciences sector. Location This position is based in Colombo, Western Province, Sri Lanka.

About GapstarsGapstars collaborates with some of Europe’s most innovative tech firms, from disruptive startups to rapidly growing scaleups, assisting them in assembling high-performing remote engineering teams.With our headquarters in the Netherlands and talent hubs in Sri Lanka and Portugal, we boast a vibrant community of 275+ engineers dedicated to tackling real-world challenges through modern technologies. Our teams span various domains, including networking, marketplaces, SaaS, and AI, delivering scalable solutions that yield significant results.If you seek a workplace that champions technical excellence, fosters a strong culture, and provides ample growth opportunities, look no further than Gapstars.About the RoleWe are currently on the lookout for an Associate Technical Lead to become part of our expanding team focused on a cutting-edge, cloud-based platform. This position is ideal for someone with a robust technical background, excellent communication skills, and a solution-oriented mindset.In this role, you will engage with both backend and frontend components, contribute to architectural strategies, and aid in the platform's evolution. We value self-starters who can take initiative and work autonomously within a lean team structure.What You’ll DoDevelop and maintain backend services utilizing C# (.NET 7) and SQL.Enhance frontend applications using TypeScript with frameworks like Blazor or Vue.Design and implement RESTful APIs, ensuring seamless integration between frontend and backend components.Leverage Azure-based cloud services to create scalable and dependable solutions.Work collaboratively with engineers and stakeholders to translate requirements into effective solutions.Engage in live troubleshooting, debugging, and performance optimization efforts.Adapt to evolving tools, frameworks, and processes as the platform progresses.