Projects and Market Rates for Frontend Engineer Side Jobs｜OPSIZM
More and more employed engineers are looking to earn extra income through side jobs by leveraging the skills they have cultivated in their primary roles as frontend engineers. With the evolution of Web technology, the frontend field has diversified, and the range of projects available for side work has expanded. This article explains four representative types of projects that you can aim to secure for side jobs or concurrent employment in the frontend field.
We have organized everything from the specific tasks involved in each project, the required technology stacks, market rates, and work arrangements, to tips for securing projects. Please use this as a reference for choosing your first side job project while considering your areas of expertise and the available time you can commit. (*This article contains promotions.)
Recommended Services for Frontend Engineer Side Jobs
Web Site Production Projects
These are projects where you handle the construction of landing pages (LP) or corporate websites for Web production companies and advertising agencies. You receive design data and are responsible for the coding. These projects are often short-term, one-off requests, and are characterized by ease of schedule management. Even if you cannot secure a large block of time, it is easy to proceed at your own pace by utilizing weekends or weekday evenings, making them suitable for engineers who have just started side jobs.
Specific Details of the Work
Based on design comps created in tools like Figma or Adobe XD, you build static Web pages using HTML, CSS, and JavaScript. Depending on the project, this may include styling with Sass or configuring build tools like Gulp or Webpack. For LPs, there are many instances where rich animation implementation to increase conversion rates or effects like scroll effects are required. For corporate sites, the application of responsive design that supports multiple devices and markup that considers Web accessibility are emphasized.
The work also includes designing semantic HTML structures with SEO in mind and performing lightweight optimizations to meet performance metrics such as Core Web Vitals. Before delivery, you conduct cross-browser testing to verify that there are no display issues in each environment.
Required Skills, Market Rates, and Work Arrangements
In addition to basic coding skills in HTML5, CSS3, and JavaScript, knowledge of modern CSS design (such as BEM or FLOCSS) is required. While some legacy projects using jQuery still remain, the use of lighter libraries has become mainstream in recent years. Market rates depend on the scale of the project, but a guideline is 50,000 to 150,000 yen per LP, and 100,000 to 300,000 yen for a full medium-sized corporate site. When converted to an hourly rate, it often settles around 2,000 to 3,500 yen.
As for work arrangements, a contract-based agreement to complete the deliverables is standard, and as long as you meet the deadline, you can decide your working hours freely. Therefore, the advantage is that it is easy to utilize weekday evenings or weekends, making it easy to adjust your schedule with your primary job. If you can receive projects regularly, you can build a foundation for stable side income.
Tips for Securing Projects
To secure this type of project, it is common to use crowdsourcing sites or matching platforms for side jobs. It is important to post a portfolio on your profile that summarizes the URLs of websites you have created so far and demos of animations you have implemented. Direct sales to production companies is also an effective method, and if you can provide high-quality coding, it is easy to lead to continuous orders. When proposing, you will increase your adoption rate by appealing not only to implementing according to the specified specifications but also to value-added skills such as “being able to optimize site loading speed” or “being capable of SEO-friendly markup.”
In addition, smooth communication skills with designers and the speed of response to revision requests are also subject to evaluation. By demonstrating business skills such as reporting progress regularly, as well as strictly adhering to deadlines, you can gain the trust of clients.
SPA/Web Application Frontend Development
These are projects to develop the frontend of Web applications using modern JavaScript frameworks such as React or Vue.js. There are many job openings from startups and in-house development companies, and you participate in the functional addition of existing products or the launch phase of new services. As high technical skills are required, it is a field where high unit prices can be expected, and it is characterized by being able to directly utilize the latest technology stacks cultivated in your primary job.
Specific Details of the Work
You will be responsible for implementing complex UI and interactive features that users operate in their browsers. Specifically, this involves designing and developing components using React or Vue.js, and building data flows utilizing state management libraries (such as Redux or Pinia). The main tasks involve coordinating with RESTful APIs or GraphQL provided by backend engineers to implement data fetching via asynchronous communication and rendering it on the screen.
Additionally, you will be required to introduce TypeScript to write type-safe code and build a highly maintainable frontend environment. In the development process, you will participate in version control using Git and code reviews via pull requests on GitHub. You may also be tasked with implementing unit tests or E2E tests using tools like Jest or Cypress, contributing to continuous code improvement for quality assurance.
Required Skills, Market Rates, and Work Arrangements
Practical experience using frameworks such as React, Vue.js, Next.js, or Nuxt is essential. Development experience with TypeScript, knowledge of API integration, and skills in performance tuning are also highly valued. Market rates are relatively high, with hourly rates ranging from 3,500 to 6,000 yen, or for fixed monthly compensation, a range of 100,000 to 250,000 yen for 1-2 days of work per week is a guideline. If you are involved from the stage of high-level technology selection or architectural design, the rates can be even higher.
As for work arrangements, many projects are joined under quasi-mandate contracts, where you collaborate with team members using chat tools like Slack and video conferencing. While most projects are fully remote, there are cases where regular meetings are scheduled during weekday business hours, so you need to check in advance whether your main job’s employment regulations allow for flexible time adjustments.
Tips for Acquiring Projects
It is efficient to search for side projects in web application development through agents or matching services specializing in IT and web engineers. By using an agent, you can be introduced to high-quality projects that match your skill set.
To acquire projects, it is important to detail your development achievements in your resume. Specifically articulate ‘which frameworks you used and what problems you solved’ and ‘what role you played in team development.’ Additionally, making your GitHub contributions or the source code of applications you developed personally public serves as objective proof of your technical skills.
In interviews, you will be evaluated as a candidate who can fit into the client company’s development structure by demonstrating not only technical knowledge but also adaptability to Agile or Scrum development and the ability to autonomously drive tasks in a remote environment.
CMS Construction and Headless CMS Integration (WordPress, etc.)
These are projects for building and customizing Content Management Systems (CMS) for owned media or corporate websites. In addition to traditional theme development using WordPress, there is an increasing demand in recent years for building modern environments that combine headless CMS (such as microCMS or Contentful) with frameworks like Next.js. You will play a role in improving display speed and security using frontend technologies.
Specific Details of the Work
For WordPress projects, you will perform customization of existing themes or scratch development of original themes. You will use PHP to write template tags and set up custom post types and custom fields to build an admin screen that is easy for operators to update. Tasks also include introducing or modifying plugins and improving the overall performance of the site.
On the other hand, for projects utilizing a headless CMS, you will build the frontend using Static Site Generators (SSG) such as Next.js or Gatsby. You will implement a mechanism to fetch content data via API from a headless CMS like microCMS and generate static HTML at build time.
This resolves the display speed issues and security risks that traditional WordPress has faced. You may also be responsible for building deployment pipelines to hosting services such as Vercel or Netlify.
Required Skills, Market Rates, and Work Arrangements
For WordPress projects, in addition to HTML/CSS/JavaScript, basic knowledge of PHP, WordPress-specific functions, and an understanding of databases are required. For headless CMS projects, skills in modern frontend technologies like React/Next.js and data fetching using REST APIs or GraphQL are required.
Market rates are around 2,000 to 3,000 yen per hour for WordPress customization projects, and 150,000 to 400,000 yen for building an entire site. Projects with a modern Jamstack configuration using a headless CMS tend to have higher rates, around 3,000 to 5,000 yen per hour.
Work arrangements include both outsourcing contracts and quasi-mandate contracts, depending on the scale of the project and the company’s development structure. If it is a small-scale media launch, it is easy to proceed with individual discretion, and it is fully possible to complete the work only on weekends.
Tips for Acquiring Projects
CMS-related projects are frequently seen as outsourcing from web production companies or direct orders from operating companies promoting digital marketing. As a key point for acquisition, it is persuasive to be able to present performance indicators (such as Lighthouse scores) of media or blogs built in the past. Especially for headless CMS projects, it is important to appeal to specific results such as “how much the page loading speed was improved” and “how the content submission flow for operators was streamlined.”
Also, having knowledge of SEO will increase your evaluation from marketing managers. It is also an effective strategy to demonstrate your understanding of modern CMS architecture through output on technical blogs or posting on platforms like Zenn. Since you will be involved in continuous media operation, you can secure a stable source of income by proposing long-term contracts that include maintenance and operational support.
4. UI/UX Improvement and Growth Hack Modification Projects
These are projects that involve frontend modifications for released web services or e-commerce sites with the goal of improving user experience and conversion rates (CVR). Based on data analysis results and A/B test verification, you will perform UI component adjustments and functional optimizations. It is a rewarding position that requires not only development skills but also a marketing perspective and quantitative thinking to grow the product.
Specific details of the work
Based on access analysis data from tools like Google Analytics or heat map tools, you will identify user drop-off points and operational bottlenecks, and implement frontend improvements. Specifically, you will be responsible for adding input assistance features to entry forms, changing button placement or color schemes, and reviewing the structure of navigation menus. You may also implement logic to switch between multiple UI patterns to verify effectiveness using A/B testing tools (such as successors to Google Optimize or VWO).
In addition, as performance tuning, the work includes introducing lazy loading for images and optimizing JavaScript execution to improve Core Web Vitals scores. After implementation, you will play a role in reviewing how the measures affected actual figures and connecting them to the next improvement cycle.
Required skills, market rates, and work arrangements
In addition to basic frontend implementation skills, an understanding of UI/UX design principles is required. It is also advantageous to have experience operating access analysis tools and knowledge of tag manager settings. The target environments are diverse, ranging from modifications to SPAs built with React or Vue.js to template editing for e-commerce platforms (such as Shopify). Market rates are often set high because the work is directly linked to results, with a rough estimate of 3,500 to 6,000 yen per hour, or 150,000 to 300,000 yen per month.
Work arrangements are mainly based on quasi-mandate contracts, where you participate in team growth hack regular meetings while working about 1 to 2 days a week. Although remote work is standard, skills for smooth asynchronous communication are required because you need to work closely with marketers, designers, and product managers.
Points for acquiring projects
This type of project tends to have high demand from operating companies that develop their own services. To acquire projects, it is important not only to have the skill to write specified code but also to appeal to your “experience in discovering issues and using technology to improve figures.” In your resume or during interviews, it is important to quantitatively convey specific achievements such as “as a result of improving display speed, the bounce rate decreased by X%” or “by modifying the form UI, the conversion rate increased by X%.” There are many cases of participating through side-job agents specializing in growth hacking or via referrals (introductions from acquaintances).
By showing a desire to contribute to business growth and demonstrating communication skills that can bridge the marketing and development departments, you will be more easily chosen as a valuable partner for the client. An attitude of being committed to the service from a long-term perspective is also appreciated.
Recommended agents for frontend engineer side jobs
When frontend engineers acquire side job projects, using an agent is an effective option. Here, we introduce three services that have a reputation for their abundance of projects and support systems, and handle job openings for weekend work and remote work.
Levtech Freelance
” Levtech Freelance ” boasts industry-leading recognition and the number of projects held as a freelance agent for IT engineers. There are plenty of job openings in the frontend field, and many projects seeking modern technologies such as React, Vue.js, and TypeScript are listed. While projects requiring 3 or more days of work per week are the main focus, side job projects that can be participated in for 1 to 2 days a week or remotely are also available for experienced professionals with practical skills. Since a dedicated representative handles everything from price negotiations with companies to contract-related procedures, you can save the trouble of doing sales activities yourself. Practical experience is required, but it is characterized by the expectation of high compensation rates.
IT Kyujin Navi Freelance
” IT Kyujin Navi Freelance ” is an agent for freelance engineers that handles projects in a wide range of industries, from web-based to business systems. There are many frontend job openings, and projects corresponding to various skill levels are available, from coding using HTML and CSS to SPA development utilizing JavaScript frameworks. A dedicated coordinator carefully interviews each engineer about their background and desired work style, and proposes projects that match their skill set. In addition, there is a follow-up system after participation, providing an environment where it is easy to consult about work-related concerns and coordination matters with clients. It is suitable for those who want to continue a stable side job over the long term.
Consult Data Bank
“Consult Data Bank” is a project introduction platform for IT engineers and consultants. It adopts a system of direct contracts with companies, and a major feature is that there are no intermediary fees (margins). Therefore, you can receive fair and high compensation directly for your frontend development skills. Since there is a wide range of projects available for short-term work of 1-2 days a week, weekday evenings, or full remote participation, it is a suitable environment for engineers with full-time jobs to utilize their spare time. It is a highly convenient service that functions not only for finding projects but also as a place for information gathering, as it allows for interaction and knowledge sharing among registered users through the system.
