Software Engineer III

ABOUT SINCH

Sinch is pioneering the way the world communicates. More than 150,000 businesses — including Google, Uber, Paypal, Visa, Tinder, and many others — rely on Sinch’s Customer Communications Cloud to power engaging customer experiences through mobile messaging, voice, and email.

Whether you need to verify users or craft omnichannel campaigns, Sinch makes it easy. Our AI-infused Super Network, APIs, and applications ensure you can connect with your customers reliably and securely, at every step of their journey.

At Sinch we “Dream Big”, “Win Together”, “Keep it simple”, and “Make it Happen”. These values are our foundation!

DESCRIPTION

We are looking for a Software Engineer III to join our Mailgun Inspect team. Inspect helps customers test and improve email quality through preview workflows, accessibility checks, code analysis, link and image validation, spam testing, and reporting.

In this role, you will focus on building modern frontend experiences using React and TypeScript. You will work closely with product managers, designers, and engineers to deliver scalable, user-friendly features that help customers solve real problems. Experience with Go and/or Node.js is a plus.

Your Impact & Responsibilities

• Build and maintain frontend applications using React and TypeScript

• Develop reusable and scalable UI components

• Collaborate with cross-functional teams to deliver customer-facing features

• Integrate frontend applications with backend APIs and services

• Improve performance, usability, accessibility, and reliability

• Participate in code reviews, testing, and troubleshooting

• Contribute to technical discussions and continuous improvement

REQUIREMENTS

• 5+ years of software engineering experience

• Strong experience with React and TypeScript

• Experience building single-page applications and reusable frontend components

• Experience consuming RESTful APIs

• Strong understanding of HTML, CSS, and modern frontend development practices

• Experience with frontend testing tools such as Cypress, Jest, or Playwright

• Strong collaboration and communication skills

This is a remote opportunity, but candidates must reside near one of our hub locations for occasional collaboration: Atlanta, GA; Chicago, IL; San Antonio, TX; Denver, CO

Who You Are

• You are an experienced frontend engineer who enjoys building polished, intuitive product experiences

• You have strong experience with React and TypeScript

• You care deeply about usability, performance, accessibility, and maintainable code

• You enjoy working collaboratively with product managers, designers, and engineers to deliver customer-facing features

• You are comfortable navigating ambiguity and turning ideas into practical, production-ready solutions

• You have a customer-focused mindset and enjoy solving real user problems

• You communicate clearly and effectively with both technical and non-technical stakeholders

• You have experience working in a SaaS or subscription-based environment

• You bring an understanding of frontend performance, scalable UI patterns, and modern development practices

• Experience with data visualization libraries, observability, or monitoring tools is a plus

• Bonus points if you have experience with Go and/or Node.js

Benefits

• STAY HEALTHY: We offer comprehensive market competitive medical, dental, and vision plans. A variety of supplemental plans are also provided to meet your individual needs including access to telehealth for all participants.

• CARE FOR YOURSELF: Take advantage of our free virtual counselling resources through our global Employee Assistance Program. Your mental health is as important as your physical health.

• SECURE YOUR FUTURE: Plan for your future with our Roth and Pre-tax 401(k) options including an employer match for all participants.

• TAKE A BREAK: Enjoy a generous paid time off program. We value balance and understand that performance at work requires time to rest at home and/or rejuvenate on vacation.

• PUT FAMILY FIRST: We know that families can be built in a variety of ways; therefore, we offer paid parental leave and family planning support.

• WORK WHEREVER: Our flexible remote work offerings allow you to work wherever you are the most productive and successful. It is what you do, not where you work, that matters.

• MAKE AN IMPACT: Support betterment in your community and beyond by taking paid time off to support a volunteer program of your choice.

The annual starting salary for this position is between $100,000 - 150,000. Factors which may affect starting pay within this range may include geography/market, skills, education, experience, and other qualifications. This role will be accepting applications until April 24, 2026 at a minimum. Please note that the application timeline may be flexible to accommodate a comprehensive candidate evaluation.