About Appier 

Appier is a software-as-a-service (SaaS) company that uses artificial intelligence (AI) to power business decision-making. Founded in 2012 with a vision of democratizing AI, Appier’s mission is turning AI into ROI by making software intelligent. Appier now has 17 offices across APAC, Europe and U.S., and is listed on the Tokyo Stock Exchange (Ticker number: 4180). Visit www.appier.com for more information.

About the role

Frontend engineers at Appier focus on handcrafting sophisticated web UI using cutting-edge front-end development technologies / tools. We work closely with UI/UX designers and backend engineers and deliver high-quality, fluent and elegant web applications to our enterprise customers, or to aid daily operations within Appier.

 [The seniority/title is determined by job-related skills, experience, and evaluation after the interview.]

Responsibilities

• Design & develop front-end architecture & interactive user interfaces
• Work closely with backend engineers to integrate services, and contribute to building lightweight RESTful APIs when necessary to support frontend functionality
• Ensures the flexibility of front-end architecture and the high performance of responsiveness
• Build reusable code and UI design systems for cross-product consistency and scalability
• Write unit, integration, and end-to-end tests to ensure code quality
• Perform code reviews to ensure existing code stay high-quality, fast, and flexible
• Handle and resolve issues escalated from the production operational environment
• Participate in idea brainstorming and contribute ideas to technology, algorithms and products

About you

[Minimum qualifications]

• 3+ years of experience in software development
• Good knowledge of HTTP, CSS, modern JavaScript (ES6+ / ECMAScript 2015+), TypeScript, HTML, DOM, and web standards
• Respect coding convention, language standard syntax, documentation
• In-depth knowledge of front-end frameworks and technologies (e.g., React.js, Vue.js) and their ecosystems.
• Proactive, good interpersonal and problem-solving skill
• Self-motivated, proactive, and a strong team player
• Solid understanding of version control (Git) and CI/CD workflows
• Experience leveraging AI-assisted development tools (e.g., GitHub Copilot, Cursor, Windsurf) to accelerate coding, debugging, and refactoring. Familiarity with these tools is expected as part of our team’s daily development workflow.
• Passion for clean code, scalability, and performance, curious about new technologies and enthusiastic about developer experience
  
  

[Preferred qualifications]

• Familiarity with modern build tools and bundlers (e.g., Babel, Webpack, Vite, Rspack, esbuild, etc.)
• Experience in CSS Pre/Post-processors (PostCSS, SASS or LESS) or modern CSS solutions (e.g., CSS Modules, Tailwind CSS, Styled Components).
• Experience in Node.js, Python, GraphQL, and integrating with various backend services and databases (e.g., MySQL, MongoDB)
• Experience with testing frameworks such as Jest, React Testing Library, Vitest, or Playwright
• Experience building or integrating SDKs or capable of developing across multiple browsers, platforms
• Experience in web performance optimization
• Familiarity with micro-frontend architecture
• Experience with data visualization

#LI-AK1

About Appier 

Appier is a software-as-a-service (SaaS) company that uses artificial intelligence (AI) to power business decision-making. Founded in 2012 with a vision of democratizing AI, Appier’s mission is turning AI into ROI by making software intelligent. Appier now has 17 offices across APAC, Europe and U.S., and is listed on the Tokyo Stock Exchange (Ticker number: 4180). Visit www.appier.com for more information.

About the role

Frontend engineers at Appier focus on handcrafting sophisticated web UIs and ad content using cutting-edge front-end development technologies and tools. We collaborate closely with designers and backend engineers to deliver high-quality, smooth, and elegant web applications for the advertising domain as well as support daily operations within Appier.

 [The seniority/title is determined by job-related skills, experience, and evaluation after the interview.]

 Responsibilities

• Design and develop reusable advertising UI components (e.g., banners, video ads) and supporting systems using modern JavaScript frameworks and AI-powered tools.
• Build and maintain a modular JavaScript library or SDK to ensure scalable, consistent, and easily integrated ad rendering and tracking.
• Optimize ad content performance through efficient loading strategies and responsive design.
• Develop integrations with external SSP platforms, ensuring compliance with technical standards.
• Implement and manage analytics tools to monitor user interaction and ad effectiveness, delivering actionable insights.
• Participate in brainstorming sessions, contributing innovative technical solutions across UI/UX, algorithms, and product development.
• Utilize AI-powered development tools (e.g., GitHub Copilot, Tabnine, Cursor) to enhance coding efficiency and maintain code quality.

About you

[Minimum qualifications]

• Solid understanding of HTML, CSS, JavaScript, TypeScript, DOM, HTTP and web standards.
• Knowledge of modern front-end frameworks like React, Vue, Svelte.
• Experienced in integrating with REST APIs and GraphQL
• Experienced with bundler: Vite, Webpack, esbuild, and Rollup.
• Familiarity with Git for version control.
• Experience ensuring cross-browser compatibility.
• Practice coding conventions, syntax standards, and thorough documentation.
• Shows initiative and strong interpersonal skills in problem-solving.
• Ability to work effectively both independently and as part of a team.

[Preferred qualifications]

• Explores and shares insights on AI tools like GitHub Copilot, Tabnine, Cursor, and AI-driven testing to enhance front-end development and code quality.
• Experienced with meta frameworks like: Next.js, Nuxt.js, SvelteKit.
• Experienced with CSS-in-JS, PostCSS, SASS, and Tailwind CSS.
• Skilled in Jest, React Testing Library, Cypress, and Playwright for testing.
• Experienced in web performance optimization using Core Web Vitals, Lighthouse, WebPageTest, and Chrome DevTools.
• Experienced in debugging on any web environments like webview or browser.
• Experienced in server-side JavaScript runtime: Node.js, bun, deno.
• Experienced with relational databases or NoSQL databases.
• Familiar with CI/CD tools (GitHub Actions, Jenkins, Bitbucket) and Docker.

#LI-AK1

About Appier 

Appier (TSE: 4180) is an AI-native Agentic AI as a Service (AaaS) company that empowers businesses to create value through cutting-edge AdTech and MarTech solutions. Founded in 2012 with the vision of “Making AI Easy by Making Software Intelligent,” Appier helps businesses turn AI into ROI through its Ad Cloud, Personalization Cloud, and Data Cloud—each powered by Agentic AI that enables autonomous, adaptive, and real-time decision-making. Today, Appier operates 17 offices across APAC, the US, and EMEA, and is listed on the Tokyo Stock Exchange.

Visit www.appier.com for more information.

About the role

Backend Development Intern at Appier works on a wide range of software projects that may extend solution innovation, impact product development processes or contribute directly to Appier’s product lines.  

We are currently looking for individuals who can commit to an internship schedule of 2-4 days (16-32 hours) per week. This internship opportunity entails a minimum duration of 6 months, beginning from the present date. We advise prospective applicants to carefully assess their availability for this commitment before submitting their applications.

After the internship, there is an opportunity to transition from an intern to a full-time position.

[ Due to the hybrid work model, this position cannot be fully remote and requires working in the Taiwan office. ]

Responsibilities

• Developing and operate scalable, reliable and maintainable service-based software and related components.
• Improve the scalability and observability of the system.
• Proposing and prototyping solutions to ease software development, monitoring of software, etc.
• Profiling and performance tuning of critical components.
• Improving system quality with test automation and related toolings.  
• Participate in idea brainstorming and contribute ideas to technology, algorithms and products.

About you

[Minimum qualifications]

• Currently pursuing a degree in Computer Science or a related technical field.
• Proficient in building web services on a Linux platform.
• Strong skills in at least one of the following programming languages: Python, Go or Java.
• Solid understanding of Network API Design principles (e.g., REST or GraphQL).
• Familiar with SQL and NoSQL databases (e.g., MySQL, MongoDB, Redis, etc.).
• Minimum familiarity with Git version control and the ability to perform basic Git operations.
• Experience with Linux-based development, including setting up application runtime environments and optimizing machine resource utilization.
• Basic proficiency in Python programming, and experience with simple coding tests and open-source contributions.
• A collaborative team player who is also capable of independent work.
• Proactive with strong interpersonal and problem-solving skills.

• Bachelor’s degree in Computer Science or a related field.
• Proficient in performance profiling and debugging tools.
• Experience in developing high-performance network services on Linux.
• Ability to design and architect large-scale distributed systems, as well as knowledge of distributed algorithms and data structures.
• Familiarity with HTML and JavaScript.
• Experience with Nginx and HAProxy.
• Knowledge of Docker and Kubernetes, including experience using these tools.
• Familiarity with automation tools (such as Ansible) and CI/CD frameworks, with practical experience using tools like Jenkins, Drone, ArgoCD, etc.
• Understanding cloud infrastructure and services (AWS or GCP), as well as concepts related to cloud vs. on-premise solutions.
• Experience with cloud managed services (e.g., EC2, S3, Lambda, Load Balancer, ECS, API Gateway, etc.).
• Understanding the basics of distributed computing and parallel programming, with experience writing parallel programs using frameworks like Hadoop, Spark, Hive, CUDA, Flink, etc.
• Enthusiastic adopter of “vibe coding” culture—collaborative, transparent, and always pushing technical excellence together.

The Company:

Placements.io is a product-first SaaS company transforming how digital media publishers and agencies manage their advertising businesses. Our platform simplifies ad sales, operations, billing, and revenue reporting—enabling our customers to scale efficiently and make smarter decisions.

With a global footprint and a strong engineering culture, we’ve been recognized on Inc.’s 5000 Fastest-Growing Companies list and named one of Will Reed’s Top 100 Early-Stage Companies to Work For. Headquartered in Seattle, we’ve expanded to New York, London, Taipei, and Singapore.

The Position:

We are looking for a Intermediate Backend Engineer to join our growing engineering team in Taipei. In this hybrid role (three days per week in office), you will be a key contributor to the design, development, and maintenance of our advertising technology platform. You’ll work alongside a talented team and collaborate cross-functionally to deliver high-quality, scalable solutions that support our clients’ evolving needs.

Placements.io continues to invest in platform innovation, including the integration of AI-driven features to enhance automation, predictive insights, and reporting performance. If you're passionate about backend development and excited about shaping the future of AdTech—including AI-driven automation and robust external integrations—this is an excellent opportunity.

• Design, build, and maintain robust, scalable APIs and backend services.

• Collaborate with product managers, designers, and engineers to define technical specifications.

• Implement backend logic to support AI-enhanced features like automated workflows and intelligent data reporting.

• Optimize system performance and resolve bottlenecks and bugs.

• Participate in code reviews to ensure quality, knowledge sharing, and maintainability.

• Conduct testing and debugging to maintain a stable and secure platform.

• Stay informed on backend and AI technology trends to drive continuous improvement.

• Contribute to agile ceremonies, including sprint planning and daily stand-ups.

• Bachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field.

• Strong backend development experience, ideally within a fast-paced tech environment.

• Proficiency in Ruby on Rails or a similar backend framework.

• Experience developing and consuming RESTful APIs.

• Solid understanding of relational databases (PostgreSQL preferred).

• Familiarity with frontend technologies (React.js, JavaScript, HTML/CSS) is a plus.

• Experience or interest in working with AI/ML-powered systems, tools, or APIs.

• Familiarity with cloud platforms such as AWS, Heroku, or Google Cloud.

• Strong problem-solving skills and attention to detail.

• Excellent collaboration and communication skills.

• Experience in the digital advertising or martech industry is a plus.

• Competitive salary
• Early-stage stock options
• 20 days of PTO
• Applicable labor insurance and pension fund
• Company paid medical, dental, vision, and life insurance
• Regular company lunches and happy hours
• Gym membership reimbursement
• Cell phone reimbursement

To apply to our open positions, please email your resume, cover letter, and the name of the position you are applying for to careers@placements.io. We look forward to meeting you!

EEO Employer: Placements.io is an equal opportunity employer; all qualified applicants will receive consideration for employment without regard to race, social class, color, religion, sex,
sexual orientation, gender identity, national origin, disability, Veteran status, languages, ideology, political affiliation, birthplace, age, appearance, facial features, marital status, zoadic sign, blood type, past labor union membership, or any other protected classification.

Reasonable Accommodation Statement

Placements.io complies with United States federal and state disability laws and makes reasonable accommodations for applicants and employees with disabilities. If reasonable accommodation is needed to participate in the job application or interview process, to perform essential job functions, and/or to receive other benefits and privileges of employment, please send a request to hr@placements.io. All requests for accommodations are treated discreetly and confidentially, as practical and permitted by law.