**Principal Front-End Engineer (React / TypeScript)**

Are you a React engineer who wants to build products where you can actually see the impact of your work?

My client is looking for a **hands-on Senior Front-End Engineer** to play a key role in shaping their technical direction. You’ll work with **React, TypeScript, and modern design principles** to build data-rich applications and reusable components that enhance the payments experience for merchants.

What you’ll do:

*   Build and optimise front-end applications with React and TypeScript.
*   Translate complex data into intuitive, responsive user interfaces.
*   Collaborate with UX, product, and engineering teams to deliver secure, user-friendly payment solutions.
*   Create and maintain a reusable component library aligned to the design system.
*   Contribute across the full development lifecycle, from requirements through to deployment.

What we’re looking for:

*   10+ years in software engineering, with front-end expertise.
*   Proven experience working with **large and complex data sets**.
*   Strong skills in modern JavaScript (ES6+), React, HTML, CSS/SASS.
*   Familiarity with REST APIs, OAuth2/OIDC, and data visualisation (D3.js or similar).
*   Payments industry experience preferred.
*   Strong analytical and problem-solving skills, with the ability to mentor and lead where needed.
*   Proactive, adaptable, and comfortable in both individual and team settings.

This is an opportunity to join a fast-moving engineering team where you’ll see the direct impact of your work on customers every day.

Principal Software Engineer (React)

**Company Description**

Careerbook is a fast-growing learner management and events/webinar booking platform for healthcare education. We automate workflows and workforce development for administrative teams in healthcare organisations. We partner with NHS Trusts, universities, small education providers and organisations. To date we have over 200 healthcare organisations, and 50,000+ active users benefitting from our platform, since launching in February 2025, growing at 60% MoM.

**Description**

We are seeking a **full-time UK based experienced full-stake senior lead developer** with particular experience with React, Node.js, PostgresSQL, AWS to lead our next stage of growth. This role requires someone who understands and has experience building SaaS products, ideally within the Edtech and Healthtech space. You must have the ability to work independently and thrive in fast-paced startup environments. It is key that you have an entrepreneurial mindset- excited by equity ownership and long term upside. Passion for solving problems within healthcare education is a bonus alongside an understanding of the NHS and higher education.

**Qualifications**

*   Strong full-stack skills in **Reast, Node.js, PostgreSQL, AWS. Min 5+ years of professional working experience**
*   Proficiency in Back-End Web Development and Programming
*   Experience building marketplaces and live- webinar fucntionality is a plus
*   Proven ability to design, build and deploy production-level SaaS applications
*   Ability to work independently and remotely
*   Must be UK based or willing to move and live in the UK upon starting the job
*   Bachelor's degree in Computer Science, Software Engineering, or related field
*   Familiarity with AI/automation tools is a plus
*   Experience in the healthcare industry is a plus
*   Experience in start-ups is a plus

**Compensations**

*   £1,000/month stipend starting salary (pre-

funding)

*   4% equity with 4-year vesting, 1-year cliff
*   Transition to full market salary (£50-70k range) once funding round closes (expected within months)
*   Retain equity alongside salary - true ownerships of the product you're building

**

Raising Details

**

Careerbook is currently raising £600k pre-seed round at a £5m pre-money valuation, with £100k already committed. Projected to reach £10m ARR by 2028.

**

How to apply

To apply please do so directly via linkedin, follow the Careerbook linkedin page and email email your CV to info@careerbook.co.uk mo

**

Senior Full-Stack Software Engineer (React, Node.js)

This part-time contract opportunity is ideal for an experienced Full Stack Engineer seeking a flexible, remote role. The position involves contributing to ongoing development projects, collaborating with a distributed team, and delivering robust solutions that align with business objectives. The role is open to professionals with a strong background in both frontend and backend technologies, who are comfortable working independently and proactively communicating progress. **Deliverables**

*   Develop, test, and deploy scalable web applications and features
*   Collaborate with team members to define project requirements and technical solutions
*   Maintain and optimize existing codebases for performance and reliability
*   Troubleshoot and resolve technical issues as they arise
*   Participate in code reviews and provide constructive feedback
*   Ensure deliverables meet quality standards and project timelines

**Requirements**

*   Proven experience as a Full Stack Developer or similar role
*   Proficiency in both frontend and backend technologies (e.g., JavaScript, React, Node.js, Python, or similar)
*   Experience with RESTful APIs, databases, and cloud platforms
*   Strong problem-solving skills and attention to detail
*   Ability to work independently and manage time effectively in a remote setting
*   Excellent communication skills for remote collaboration
*   Availability for part-time contract work

**About Twine** Twine is a leading freelance marketplace connecting top freelancers, consultants, and contractors with companies needing creative and tech expertise. Trusted by Fortune 500 companies and innovative startups alike, Twine enables companies to scale their teams globally. **Our Mission** Twine's mission is to empower creators and businesses to thrive in an AI-driven, freelance-first world.

Full Stack Engineer – Part-time (Remote)

**I am supporting a well invested Product Company (Start-up) who are building a unique platform within the sustainability and supply chain market. They are a tech for good Product Company who are using technology to really make a positive change to global supply chains.**

They are looking for **1 x Full-Stack Engineer** to join their engineering team and help spearhead the development of their exciting platform. You'll be joining their CTO & four Engineers - really exciting times ahead! This is a real chance to work closely with the CTO and shape the platform.

Everything is greenfield and you will get a chance to play a very important role in shaping both the product and the company!

They are looking for passionate Full-Stack Engineers with at least 4 years of experience with **TypeScript, Node.js, MongoDB, PostgreSQL & AWS + Any React is also a nice to have.**

Any experience working in a start-up, coming from a product background is a plus!

They can offer up to £80k and offer equity within the business. They require you to come into the office in London once a month

Great chance to join a tech for good product company who are scaling & building a product thats making a positive impact!

Their interview process is 2 stage:

*   Culture Fit chat w/ CTO
*   2 Hour tech & culture IV

Full-Stack Engineer (React/ Node/ TypeScript/ AWS) - Sustainability Product Company (Tech for good) - £80k - Remote

Acro Companion is the leading worldwide gymnastics platform and is working together with federations and competition organizers around the world (UK, Germany, Portugal, The Netherlands, Switzerland, Austria, France, Belgium, Bulgaria, Israel, USA, Ireland, Schotland, …) to fundamentally change how gymnastics competitions (and sports competitions in general) are organized and experienced. **The RoleRole Overview** As a member of our development team, you'll be instrumental in implementing and analysing features for our Angular-based web application. You will use the cutting-edge versions of Angular (signals, zoneless), NX, google cloud + node, No-SQL + SQL firebase, python for deep learning models for real-time judging and for operational research, … **Location:** Our team is located in different areas of the world (Tunisia, Portugal, Belgium) and works remotely. **Ideal ProfileRequirements(!! please do not apply if you don't have 2 years of non-internship experience. We are very sorry but we are not open to early junior profiles)**

*   REQUIRED: Proficiency in Angular and TypeScript. A minimum of 2 years actual professional experience in Angular. Make sure to understand the foundations of Angular. How does Zone.js work? What is the difference between signals and observables? ...
*   REQUIRED: Professional-level English. Our team communicates in English. Your English doesn't have to be perfect, but you need to be able to discuss with your team members easily.
*   REQUIRED: Familiarity with HTML, CSS, and responsive design principles
*   REQUIRED: Excellent problem-solving skills and attention to detail
*   REQUIRED: Collaboration, openness and willingness to learn in an agile development environment

**Bonus Skills**

*   Understanding of Firebase services (Firestore, Authentication, Cloud Messaging, etc.)
*   Knowledge of serverless architecture (Firebase Cloud Functions)
*   Experience with version control systems (Git)
*   Understanding of UX/UI principles
*   Previous experience with Scrum or other agile methodologies

**What's on Offer?**

*   Work within a company with a solid track record of success
*   Work alongside & learn from best in class talent
*   Opportunity to make a positive impact

Remote Angular full-stack developer

Scandit gives people superpowers. Whether enabling delivery drivers to make quicker deliveries, matching a patient with their medication, or allowing retailers to make store operations more efficient, our technology automates workflows. It provides specialty tools to help businesses in a variety of industries. Join us as we continue to expand, grow, innovate, and help take Scandit to the next level.

Our low code solution is called Scandit Express and it’s an app that lets customers leverage advanced scanning capabilities in their existing systems with minimal additional work. For example, Express allows high volume inventory management with fast scanning and data exports to a wide range of supported formats and mediums. It also replaces old dedicated scanning hardware with a familiar and user-friendly mobile experience for improved worker productivity.

**About the role** 

You will be responsible for the Scandit Express app. The app enables customers to use advanced scanning solutions with their existing systems in an efficient and intuitive manner. Express is used in production environments and growing constantly, and new features and improvements will have a direct impact on the users.

What you will do

As a Senior iOS Software engineer, you will play an instrumental role in architecting and implementing features, improving the stability and reliability, and working with stakeholders on defining and shaping the future of how users can capture data and optimize operations.   

**Who you are**

*   You are proficient with Swift and know your way around the iOS universe
*   You have experience with a variety of integration options between an iOS app and other apps on device, or remote systems 
*   You appreciate good software architecture and love to apply it to your code
*   You have a track record of creating beautiful, engaging user experiences on iOS
*   You are thorough and pay attention to detail
*   You love to collaborate in a small and international team and quickly iterate on feedback. If required, you can take a leading role and own the delivery of features or projects. 
*   You are willing to go beyond your role, your team and (sometimes) your comfort zone to make a cross-functional impact on the business

**What we offer**

Here are just some of the reasons why people choose to build their career at Scandit: 

*   A highly skilled team and a fun environment where you can put your enthusiasm for cutting-edge technologies to use
*   Hackathons 
*   Flexible, office, hybrid or home working
*   People-first culture
*   Team outings 
*   Festive/end of year all company celebrations 
*   Your birthday off 
*   An attractive individual equity plan in a high growth company 
*   We are certified as a **“Great Place to Work”** in 10 countries!
*   Excellent office infrastructure, optimized for hybrid working in Zurich, Warsaw, Tampere, and London.
*   Excellent support for remote work across Switzerland, Finland, Poland, UK, Italy and Germany
*   Specific benefits related to the location you are joining

_At Scandit we strive to create an inclusive environment that empowers our employees. We believe that our products and services benefit from our diverse backgrounds and experiences and are proud to be a safe space for all._

_All qualified applications will receive consideration for employment without regard to race, colour, nationality, religion, sexual orientation, gender, gender identity, age, physical \[dis\]ability or length of time spent unemployed._

# LOC-Remoteengineering

Senior iOS Mobile Software Engineer

Join a high-impact project to implement a full redesign of a leading AI-powered contract management platform’s marketing website. All UX/UI designs are finalized in Figma, and your expertise will be crucial in translating these into responsive, accessible, and semantic HTML using TailwindCSS v4, Alpine.js, and the Hugo static site generator. You will be responsible for building modular, reusable components, ensuring pixel-perfect implementation across devices, and delivering both static HTML and Hugo-integrated pages. The project scope includes approximately 20 template/page types, replacing or optimizing existing animations, and collaborating with the internal team for a phased rollout. The ideal candidate is detail-oriented, passionate about clean code, and experienced in modern frontend workflows. The project is expected to last around 8 weeks and will begin as soon as possible. **Deliverables**

*   Develop responsive, accessible, and semantic HTML pages based on finalized Figma designs
*   Implement modular, reusable components using TailwindCSS v4 and Alpine.js
*   Integrate pages and components into the Hugo static site generator
*   Replace or optimize existing website animations; experience with Lottie, sal.js, or similar libraries is a plus
*   Ensure pixel-perfect implementation across all major devices and browsers
*   Collaborate with the internal team for phased rollout and feedback cycles
*   Deliver finalized HTML files and Hugo components/layouts in the designated repository

**Requirements**

*   Proven experience in frontend development with a focus on responsive and adaptive design
*   Advanced proficiency in TailwindCSS (v4 preferred), Alpine.js, and static site generators (Hugo strongly preferred)
*   Strong skills in semantic HTML, accessibility best practices, and clean code principles
*   Experience translating Figma designs into production-ready code
*   Familiarity with animation libraries such as Lottie or sal.js is a bonus
*   Ability to build modular, reusable components for scalable websites
*   Excellent attention to detail and commitment to pixel-perfect implementation
*   Strong communication skills and ability to collaborate with internal teams
*   Availability to start promptly and commit to an 8-week project timeline

**About Twine** Twine is a leading freelance marketplace connecting top freelancers, consultants, and contractors with companies needing creative and tech expertise. Trusted by Fortune 500 companies and innovative startups alike, Twine enables companies to scale their teams globally. **Our Mission** Twine's mission is to empower creators and businesses to thrive in an AI-driven, freelance-first world.

Frontend Developer – Website Redesign (Contract)

\*\*Volunteer JavaScript Developer (Unpaid)\*\* \*\*🚀 About Us\*\* JobSearch.Works (JSW) is an AI-powered assistant that applies for jobs so users don’t have to. Our platform automates resume tailoring, form filling, and recruiter email tracking — helping job seekers save hours each week. We’re a volunteer-driven startup, building our MVP now and looking for passionate contributors. \*\*🧠 Role Overview\*\* As a JavaScript Developer, you’ll help build our frontend features and Chrome Extension, working with React/Node.js and collaborating with our AI + product teams. This role is ideal for developers wanting real-world startup experience while contributing to an impact-driven project. \*\*🔄 Responsibilities\*\* Develop and maintain features with JavaScript/TypeScript (React, Node.js) Collaborate on API integrations and new features Write clean, maintainable code & participate in Agile teamwork \*\*✅ Requirements\*\* Proficiency in JavaScript (ES6+), React, Node.js Understanding of REST APIs & Git workflows Problem-solving mindset & ability to work in a distributed team \*\*🌱 Nice to Have\*\* AI/LLM experience Firebase/Firestore Google Cloud \*\*✨ What You’ll Gain\*\* Portfolio-ready contributions to a live SaaS product Hands-on AI + automation experience Mentorship, Agile teamwork, and startup exposure

Volunteer JavaScript Developer (Unpaid)

Upwork ($UPWK) is the world’s work marketplace. We serve everyone from one-person startups to over 30% of the Fortune 100 with a powerful, trust-driven platform that enables companies and talent to work together in new ways that unlock their potential.

Last year, more than $3.8 billion of work was done through Upwork by skilled professionals who are gaining more control by finding work they are passionate about and innovating their careers.

This is an engagement through Upwork’s Hybrid Workforce Solutions (HWS) Team. Our Hybrid Workforce Solutions Team is a global group of professionals that support Upwork’s business. Our HWS team members are located all over the world.

Upwork is undergoing a platform transformation to meet the evolving demands of AI-native product experiences. As a Staff Software Engineer on the Web Platform team, you will lead the design and development of our next-generation web architecture, empowering teams across Upwork to build dynamic, agent-driven user interfaces with speed and confidence.

You’ll play a pivotal role in defining how our platform supports modular, performant, and scalable frontend experiences. This includes driving the adoption of federated app shell architecture, pioneering horizontal micro apps, and optimizing developer workflows to support modern AI toolkits. If you thrive at the intersection of architecture, performance, and developer experience and are excited by the opportunity to shape future AI experiences, this is the role for you.

**Work/Project Scope:**

*   **Architect and build** modular frontend infrastructure with hybrid rendering (SSR, edge functions, client hydration) to support dynamic AI-native UIs.
*   **Lead development of an app shell model** to enable federated delivery of horizontal micro frontends across teams, with strong ownership boundaries and runtime flexibility.
*   **Develop and evangelize AI toolkit components**, enabling common interaction patterns (clarify, retry, fallback, tone) to be reused across the platform.
*   **Set technical direction** and collaborate with platform leads, design systems, and developer tooling teams to ensure consistency, governance, and rapid iteration support.
*   **Evaluate and scale frameworks** (e.g., React, Next.js) that align with emerging LLM agent SDKs and support agentic UI flows.
*   **Mentor engineers** and contribute to technical leadership across Product Engineering through architecture reviews, design discussions, and shared learning.
*   **Collaborate cross-functionally** with Product, Design, and Infrastructure teams to align platform capabilities with user-facing needs.

**Must Haves (Required Skills):**

*   8+ years of experience in frontend development with deep knowledge of modern frameworks (React, Vue, Next.js, etc.) and native browser APIs.
*   Strong understanding of web architecture principles: security by design, server/client rendering paradigms, hydration techniques, micro frontends.
*   Experience designing for runtime UI composition, shared component governance, and telemetry/a11y/compliance hooks.
*   Deep knowledge of building for performance at scale: modular loading, edge delivery, multi-level caching, streaming responses.
*   Passion for AI-native patterns and agentic workflows; familiarity with LLM SDKs and AI UI concepts a plus.
*   Proven track record of leading architectural transitions in complex product ecosystems.
*   Excellent communication and collaboration skills, especially in cross-team roles.

**Nice to have Skills:**

*   Hands-on work with observability pipelines, and build/deployment tooling.
*   Familiarity with widget-based delivery, embeddable apps, cross-context communication.
*   Prior experience in a high-scale consumer or enterprise SaaS environment.
*   Contributions to internal or open-source design systems or component libraries.

Upwork is proudly committed to fostering a diverse and inclusive workforce. We never discriminate based on race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical condition), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.

Staff Software Engineer, Web Platform

Join a dynamic team as a contract developer, working remotely on a range of ongoing projects that require expertise in both front-end and back-end technologies. This role is ideal for professionals with a strong background in React, Typescript, and Python, who are eager to contribute to innovative solutions in a collaborative environment. You will play a key part in developing scalable applications and supporting the technical needs of various projects, ensuring high-quality deliverables and efficient workflows. **Responsibilities**

*   Design, develop, and maintain web applications using React, Typescript, and Python
*   Collaborate with cross-functional teams to define, design, and ship new features
*   Write clean, maintainable, and efficient code following best practices
*   Troubleshoot, debug, and optimize application performance
*   Participate in code reviews and provide constructive feedback to peers
*   Ensure the technical feasibility of UI/UX designs
*   Stay updated with emerging technologies and propose their adoption where appropriate

**Skills And Requirements**

*   Proven experience with React, Typescript, and Python in a professional setting
*   Strong understanding of modern web development practices and RESTful APIs
*   Familiarity with version control systems such as Git
*   Ability to work independently and manage time effectively in a remote environment
*   Excellent problem-solving skills and attention to detail
*   Strong communication skills for effective remote collaboration
*   Availability for a full-time contract position
*   Prior experience with remote teams is a plus

**About Twine** Twine is a leading freelance marketplace connecting top freelancers, consultants, and contractors with companies needing creative and tech expertise. Trusted by Fortune 500 companies and innovative startups alike, Twine enables companies to scale their teams globally. **Our Mission** Twine's mission is to empower creators and businesses to thrive in an AI-driven, freelance-first world.

Freelance Full Stack Developer – React & Python

We are looking for a Full Stack Engineer to join our team to train AI models. You will measure the progress of these AI chatbots, evaluate their logic, and solve problems to improve the quality of each model. To apply to this role, you will need to be proficient in either Python and/or JavaScript. Your role will require proficiency in at least one programming language (JavaScript, Python, C#, C++, HTML, SQL, or Swift) in order to solve coding problems (think LeetCode, HackerRank, etc). For each coding problem, you must be able to explain how your solution solves the problem. **Benefits**

*   This is a full-time or part-time REMOTE position
*   You’ll be able to choose which projects you want to work on
*   You can work on your own schedule
*   Projects are paid hourly starting at $40+ USD per hour, with bonuses on high-quality and high-volume work

**Responsibilities**

*   Give AI chatbots coding challenges and evaluate their outputs
*   Evaluate the quality produced by AI models for correctness and performance

**Qualifications**

*   Fluency in English (native or bilingual level)
*   Detail-oriented
*   Experience with algorithms, data structures, and debugging workflows
*   A current, in progress, or completed Masters and/or PhD is preferred but not required

**Notes** Payment is made via PayPal. We will never ask for any money from you. PayPal will handle any currency conversions from USD. Only applicants in Australia will be considered for this role. This is an independent contract position. #coder

Principal Software Engineer (React)

Job Description

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