Senior Web UI Developer (React), New York

ION Group iongroup.com Open · verified Oct 24, 2026

On-site New York Full-time Senior Frontend Engineering

At a glance

Senior Frontend Engineering role at ION Group. New York · full-time · $160,000–$185,000 base.

SalaryStated by ION Group

$160,000 – $185,000

Base salary for this role, in USD per year, as published in the posting.

This role, from ION GroupOur estimate for the market: $201,250–$225,000Median $212,650

Below the market median of $212,650 for senior frontend engineering roles in New York.

Worked out from 34 postings that stated pay, median $212,650. Last updated Oct 23, 2026.

RoleFrontend Engineering

SenioritySenior

LocationNew York

WorkplaceOn-site

EmploymentFull-time

Base pay$160,000–$185,000

PostedOct 14, 2016 · 10y ago

Role brief

techroles summary, based on the employer's posting.

What you'll do

Build web applications designed to handle demanding throughput, latency and resiliency needs
Develop front-end software with modern frameworks, with React as the preferred choice
Deliver project work on schedule and within budget
Help shape and build the next generation of technology through design and development

What you bring

At least five years of professional web or front-end development experience
Strong JavaScript skills and experience building single-page applications with modern frameworks
Solid HTML5 and CSS3 skills, plus familiarity with Agile development
A computer science, engineering, physics or math degree, or related work experience

Who this fits

This role suits a senior frontend developer with React experience and an interest in financial markets and products. The position is onsite in New York.

From the employer

Lab49 has an opportunity available for a Web UI Developer to lead work on complex and challenging projects to drive transformative change for our top-tier Financial Services clients. Operating in an Agile environment, the Web UI Developer will have strong experience developing software in various front-end frameworks, with a focus on design and build the next generation of technology.

Responsibilities

You will build applications that push the envelope when it comes to throughput, latency, resiliency, all the while making sure that we deliver on-time and within budget.

Required Skills and Experience

5+ years of commercial-grade web/front-end development experience.
Strong experience in JavaScript, ideally ES6 or ES7, building Single Page Web Applications with modern frameworks, preferably using React.
Solid skills in HTML5 and CSS3.
Knowledge of the Agile Development Methodology.
Strong interpersonal and organizational skills.
Knowledge of, and strong demonstrated interest in, global financial markets and financial products is a strong plus.
Bachelors or Masters in Computer Science, Engineering, Physics, Math, or related work experience.

We are hiring across multiple levels for this job. The base salary range across different levels are - • Mid to Senior level – $160,000 - $185,000 Placement within the range provided above is based on the individual’s relevant experience and skills for the role and level. We are hiring across multiple levels for this job. Base salary is only one component of our total compensation package. Employees may be eligible for a discretionary bonus, which is determined upon company and individual performance. Salary range disclosure as required by S9427A when hiring in New York. Lab49 is a specialist strategy, design, and technology consulting company dedicated to the financial services industry. We were founded in 2002 to fill a need in the Financial Technology marketplace for high-end execution and reliable delivery of technology projects. Our consultants are experts in strategy, user experience, architecture, engineering, and delivery management. We combine knowledge of the latest trends in technology with deep domain expertise to deliver innovative solutions with accelerated time-to-market. We have office hubs in Midtown Manhattan, Washington DC, London, Budapest, New Delhi and Sydney. Lab49/ION is committed to maintaining a supportive and inclusive environment for people with diverse backgrounds and experiences. We respect the varied identities, abilities, cultures, and traditions of the individuals who comprise our organization and recognize the value that different backgrounds and points of view bring to our business. Lab49/ION adheres to an equal employment opportunity policy that prohibits discriminatory practices or harassment against applicants or employees based on any legally impermissible factor.

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