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Mid Level Frontend Developer Jobs in Concord, MA

hOS

Frontend Developer

Boston, MA · On-site

$113K - $131K/yr

About the role In this role, you will engineer and develop the frontend that will serve 10s of ... English level - Intermediate or higher * Experienced using self-improvement apps (habit trackers ...

H&H

Mid-Level Structural Engineer

Boston, MA · On-site

We are offering an exciting opportunity for a Mid-level Structural Engineer to join our team in our Boston, MA Office. H&H is a nationally recognized, full-service infrastructure engineering firm ...

H&H

Mid-Level Structural Engineer

Boston, MA

We are offering an exciting opportunity for a Mid-level Structural Engineer to join our team in our Boston, MA Office. H&H is a nationally recognized, full-service infrastructure engineering firm ...

Blitzy

Senior Front End Engineer

Cambridge, MA · On-site

$150K - $185K/yr

... and developer tools. Required Experience * 10+ years of frontend development experience with a proven track record of building complex, production-grade applications. * Expert-level knowledge of ...

H&H

Mid-Level Structural Engineer

Boston, MA · On-site

We are offering an exciting opportunity for a Mid-level Structural Engineer to join our team in our Boston, MA Office. H&H is a nationally recognized, full-service infrastructure engineering firm ...

BL COMPANIES INC

Bridge Mid-level Engineer

Dedham, MA · Hybrid

$90K - $105K/yr

Bridge Mid-level Engineer Our growth offers an exciting opportunity for a Bridge Engineer in our Transportation group. We are looking for individuals with an interest in bridge design and/or bridge ...

Waterfield Design Group, Inc.

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Mid-Level Civil Engineer

Woburn, MA · On-site

$65K - $175K/yr

Mid-level civil engineer wanted for growing full-service site design company located 10 minutes outside of Boston. Ideal candidate is an experienced EIT with 3-12 years of experience and at least a ...

New

Veteran-friendly

Urgent

Waterfield Design Group, Inc.

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Mid-Level Civil Engineer

Framingham, MA · On-site

$65K - $175K/yr

Mid-level civil engineer wanted for growing full-service site design company located 10 minutes outside of Boston. Ideal candidate is an experienced EIT with 3-12 years of experience and at least a ...

New

Veteran-friendly

Urgent

Waterfield Design Group, Inc.

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Mid-Level Civil Engineer

Medford, MA · On-site

$65K - $175K/yr

Mid-level civil engineer wanted for growing full-service site design company located 10 minutes outside of Boston. Ideal candidate is an experienced EIT with 3-12 years of experience and at least a ...

New

Veteran-friendly

Urgent

Waterfield Design Group, Inc.

Be Seen First

Mid-Level Civil Engineer

Framingham, MA · On-site

$65K - $175K/yr

Mid-level civil engineer wanted for growing full-service site design company located 10 minutes outside of Boston. Ideal candidate is an experienced EIT with 3-12 years of experience and at least a ...

New

Veteran-friendly

Urgent

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All JobsMid Level Frontend Developer JobsMid Level Frontend Developer Jobs in Concord, MA

Mid Level Frontend Developer information

See Concord, MA salary details

$46.5K

$120.8K

$170.2K

How much do mid level frontend developer jobs pay per year?

As of Aug 22, 2026, the average yearly pay for mid level frontend developer in Concord, MA is $120,820.00, according to ZipRecruiter salary data. Most workers in this role earn between $113,800.00 and $132,400.00 per year, depending on experience, location, and employer.

What is a mid level frontend developer?

Mid Level Frontend Developers are professionals with a few years of experience building and maintaining the user-facing parts of websites or web applications. They are proficient in HTML, CSS, and JavaScript, and often work with frameworks like React, Angular, or Vue.js. Mid level developers are capable of taking on more complex features and tasks independently, collaborating with designers and backend developers, and contributing to code reviews and project planning. They bridge the gap between junior and senior roles by demonstrating problem-solving skills, code quality, and a good understanding of best practices.

What skills and qualifications are needed to thrive as a mid level frontend developer?

To thrive as a Mid Level Frontend Developer, you need strong proficiency in HTML, CSS, JavaScript, and modern frontend frameworks like React or Angular, along with a relevant degree or equivalent experience. Familiarity with version control systems (such as Git), build tools, and testing frameworks is typically required. Effective problem-solving, attention to detail, and clear communication are essential soft skills for collaborating with designers and backend developers. These skills ensure the delivery of high-quality, user-friendly web applications that meet both technical and business requirements.

What are common challenges a mid level frontend developer faces when integrating with backend services, and how can these be managed?

Mid Level Frontend Developers often encounter challenges such as handling inconsistent API responses, managing asynchronous data flows, and ensuring seamless communication between the frontend and backend. To address these issues, it's important to collaborate closely with backend developers, maintain clear API documentation, and use tools like Postman or Swagger for testing. Additionally, implementing robust error handling and utilizing state management libraries can help ensure a smooth user experience and efficient debugging.

Are mid level front end developers still in demand?

Mid level front end developers are currently in strong demand due to ongoing digital transformation and the need for user-friendly interfaces. Skills in JavaScript frameworks like React or Angular, along with knowledge of HTML and CSS, remain highly valued by employers across various industries.

What cities near Concord, MA are hiring for Mid Level Frontend Developer jobs?

Cities near Concord, MA with the most Mid Level Frontend Developer job openings:

Mid Level Frontend Developer jobs near you
Infographic showing various Mid Level Frontend Developer job openings in Concord, MA as of August 2026, with employment types broken down into 72% Full Time, 18% Part Time, 1% Temporary, and 9% Contract. Highlights an 91% Physical, 4% Hybrid, and 5% Remote job distribution, with an average salary of $120,820 per year, or $58.1 per hour.

Frontend Developer

hOS

Boston, MA • On-site

$113K - $131K/yr

Full-time

Re-posted 15 days ago

Job description

hOS is an early-stage technology company founded in 2021 by several DataRobot alumni and former executives, including founder and former CEO Jeremy Achin. The company is operating in stealth-mode developing scalable technologies and AI-driven products that will make significant positive change in the world.

About the role

In this role, you will engineer and develop the frontend that will serve 10s of millions of users. There is no legacy codebase which means you don't need to suffer from old poor-written code, you need to write clean code from scratch. As one of the first engineers in the company, you will be responsible for ensuring the code style is implemented consistently across the codebase right from the start. Keeping the code modular and easy to read is one of the top priorities.

At the same time, as a start-up, we are moving at a fast pace, so you need to be agile and focus on delivering software that does the job first and then improve it step by step. You will work directly with the founding team.

Responsibilities

  • Develop frontend (the framework doesn't matter as long as you can effectively use it)

  • Deliver efficient code that does the job first and iteratively improve it later

  • Adhere to code guidelines and keep co-workers accountable for it as well

  • Ship code that is easy to read, maintain and debug

  • Be on top of all most recent code practices, libraries and frameworks and push the team to use better tools

  • Conduct thoughtful code reviews for your team members

Basic qualifications

  • 3+ years of experience as a frontend developer

  • Proficiency in unit/integration testing

  • Good understanding of how to implement useful logging

  • The skill of documenting your own code (writing useful comments)

  • You iterate quickly with short feedback loops

  • You're comfortable with change and ambiguity and thrive working autonomously

  • English level - Intermediate or higher

  • Experienced using self-improvement apps (habit trackers, time management tools, fitness trackers, etc.)

Preferred qualifications

  • Previous experience working at high growth start-ups

  • Previous experience working with distributed teams in different time zones

  • Previous experience building backends to support millions of users


We are an equal opportunity employer and select individuals best matched for the job based upon job-related qualifications regardless of race, religion, color, creed, sex, sexual orientation, age, ancestry, national origin, gender identity, genetic information, disability, pregnancy, veteran or military status or any other status or characteristic protected by law.

hOS logo

About hOS

Sourced by ZipRecruiter

Industry

It services

Company size

11 - 50 Employees

Headquarters location

Boston, MA, US

Year founded

2021

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