---
title: 'Senior Full Stack Developer, New York at ION Group'
canonical: 'https://feeny.ai/job/senior-full-stack-developer-new-york-ion-group-new-york-g4b797xffrkt'
type: 'job'
last_seen: '2026-10-16'
---

# Senior Full Stack Developer, New York at ION Group

- **Company:** ION Group
- **Location:** New York, NY
- **Compensation:** $170k–$200k
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-08-06
- **Last confirmed live:** 2026-10-16
- **Apply:** https://jobs.lever.co/ion/2c7b86bb-99c7-4cfb-ae49-1133fbc53918

## Job description

Lab49 is an award-winning specialist consultancy that creates bespoke technology in partnership with the most important companies in finance.   We were founded in 2002 to bring Silicon Valley solutions to Wall Street’s door. Since then, we have worked on successive waves of technological change, including distributed computing, high-speed automation, enterprise UX and digital distribution (for which Lab49 was among the first significant practices established on Wall Street), DevOps, cloud and data science.

Today, we are an established partner in financial markets, having delivered hundreds of projects for clients including all the world’s tier-one investment banks and many of the largest buy-side firms globally.

Being part of Lab49 means bringing your drive and creativity into an environment where your contributions will make immediate impact. Engineers will work in cross functional teams, consulting directly with our clients, shaping not only technical solutions to business problems but delivering them into production.

Currently LAB49 is looking for a Senior Full-Stack Developer will play a critical leadership role on a key project for a strategic Lab49 client - a global asset management powerhouse. Working in a collaborative cross functional project team, with direct client-facing interactions, you will have an opportunity to lead a team of engineers and build modern digital products.

What you’ll be doing:

- Partnering with our client to lead the design and build of a structured products trading platform using modern development technology and techniques. You will be responsible for managing engineering deliverables, and the relationships with other key contributors to deliver great software.
- Design, document, and plan for the technical implementation and delivery of working software into production.
- Act as a hands-on engineer and architect to support ongoing project work. Lead and actively participate in projects, serving as a role model for project teams and collaborating with other practices to ensure successful outcomes.
- Partner with client counterparts and stakeholders to maintain and build relationships, maintaining a commercial approach. Develop strong relationships with clients as a strategic partner and technical advisor, contributing to expanding our footprint and securing follow-on work.

What you should have:

- 8+ years of solid hands-on experience with Python or C# development.
- Hands-on experience with React and modern front-end state management.
- Extensive experience architecting solutions on AWS, including Terraform and Docker.
- Proven track record operating effectively inside large, complex organizations (e.g., Tier-1 Investment Banks or Global Asset Managers).
- Deep understanding of SQL and data persistence strategies at scale.
- BS in Computer Science or equivalent experience.
- Expert-level knowledge of, and strong demonstrated interest in, global financial markets and financial products.

Why Lab49? Lab49 is an established partner for most financial institutions on Wall Street. You will gain exposure into a variety of environments, business domains, technologies, and people. Your ability to bring drive and creativity to the role will be the key component to success at Lab49. The broad and intense exposure to a variety of challenges accelerates your career growth, and Lab49’s structure is designed to enable you to learn and grow as an engineer and consultant.

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.

## About ION Group

## Company Overview
- **One-liner**: ION Group delivers mission-critical trading, treasury, and workflow automation software to financial institutions, corporations, central banks, and governments.
- **Entity Type**: Private (privately held, with venture funding rounds)
- **Headquarters**: London, United Kingdom
- **Founded**: 1998 (per Crunchbase and LinkedIn) / 1999 (per Wikipedia)
- **Founders**: Andrea Pignataro

## Core Business
- **Primary industry**: Financial technology (trading & risk management, treasury, capital markets software)
- **Target customers**: B2B – banks, asset managers, hedge funds, central banks, corporates, and governments
- **Mission/purpose**: “We help our customers do more, faster and better than before” by combining automation with a strategic view of the industries they serve.

## Products & Services
(Source: [crunchbase.com](https://www.crunchbase.com/organization/ion-group))
- **Openlink**: Treasury and risk management platform for commodity-intensive organizations (real-time cash management, FX, derivatives trading).
- **City Financials**: Pre-configured treasury and risk management solution for multinational corporations.
- **Treasura**: SaaS-based treasury management system for advanced cash management.
- **Reval TS**: Liquidity management system for banks (cash concentration, visibility, interest calculations).
- **ETRM/CTRM Solutions**: Energy and commodity trading and risk management solutions.
- **XTP Execution**: Integrated cleared derivatives trading solution (order management, execution, connectivity).
- **Fidessa, Dealogic, Acuris, Allegro**: Acquired platforms covering equities, derivatives, M&A data, and capital markets analytics.

## Market Standing
- **Valuation/Market Cap**: Not disclosed (private company)
- **Key Metrics**:
  - **Annual Revenue**: $3.3B (per LinkedIn – source: [linkedin.com](https://linkedin.com/company/iongroup))
  - **Total Funding**: $400M (venture round in May 2016) + €35M (venture round in June 2004) – source: [linkedin.com](https://linkedin.com/company/iongroup)
- **Notable Investors/Partners**: No lead investors explicitly named; early rounds from undisclosed sources. Key partners include financial institutions using its platforms.
- **Growth Signals**:
  - Headcount: 2,944 (LinkedIn, +1.7% YoY) vs. 13,000+ (careers page – discrepancy likely due to different reporting methods).
  - Major acquisitions: Dash Financial Technologies (2021), Clarus Financial Technology (2021), Broadway Technology (2020), Acuris ($1.8B, 2019), Prelios S.p.A. ($1.5B, 2023), Fidessa (£1.5B, 2018), Allegro (2019), Dealogic (2017).
  - Never sold a business since founding (Wikipedia).
  - Operates in 18+ countries, 84 offices globally.

## Competitive Advantages
- **Breadth of mission-critical software**: Covers the full trade lifecycle (pre-trade, execution, risk, treasury, post-trade) for multiple asset classes.
- **Acquisition-driven expansion**: Absorbed market leaders in different niche verticals, creating a unified platform with deep domain expertise.
- **Long-term ownership mentality**: Founder Andrea Pignataro has never sold a business, signaling stability and commitment.
- **High switching costs**: Clients rely on ION for core financial operations; replacing systems is extremely difficult.
- **Global scale**: 13,000+ employees, 84 offices, presence in 46 countries (LinkedIn breakdown).

## Strategic Focus
- **Automation & AI**: Investing heavily in research and development to “shape the future of automation” (company website).
- **Expansion into asset management**: Acquisition of Prelios (2023) and Clarus (2021) signals push into real estate and derivatives analytics.
- **Graduate development programs**: Launching programs in Pisa, Trento, and other locations to build talent pipeline.
- **Resilience after ransomware attack**: In Feb 2023, LockBit ransomware hit ION’s derivatives platform; clients faced disruptions but systems were restored within weeks. The company continues to focus on security and compliance.

## Why Work Here
- **Culture**: Described as “visionary innovators” with a “positive culture of continuous improvement.” Emphasis on community and collaboration.
- **Remote/Hybrid**: Some roles are hybrid (e.g., Milan-based positions); many are office-based depending on location. The careers page lists full-time and hybrid options.
- **Notable perks**: Graduate development programs, global mobility across 84 offices, exposure to mission-critical financial systems.
- **Engineering culture**: Large technical team (1,060+ in technical roles), with focus on React, DevOps, cloud engineering, and AI. Recent open positions include Senior Web UI Developer, iOS Engineer, and AI Engineer.
- **Growth trajectory**: Rapid scaling through acquisitions and organic hiring; opportunities to work on cutting-edge fintech products.
- **Diverse locations**: Offices in London, New York, Noida, Budapest, Chisinau, Milan, Mexico City, and more.

## Sources
1. [linkedin.com](https://linkedin.com/company/iongroup) – Employee count, revenue, funding, acquisitions, workforce breakdown
2. [en.wikipedia.org](https://en.wikipedia.org/wiki/Ion_Group) – Founding, founders, acquisition history, ransomware attack
3. [crunchbase.com](https://www.crunchbase.com/organization/ion-group) – Products, funding, overview
4. [iongroup.com](https://iongroup.com/careers/) – Careers page, open positions, company values
5. [jobs.lever.co](https://jobs.lever.co/ion) – Current job listings

## Other roles at ION Group

- [Senior Regulatory Reporter](https://feeny.ai/job/senior-regulatory-reporter-ion-group-beijing-tefwrsdpyqjq) — Beijing, China
- [Rotational Analyst, 2027 Leadership Development Program, London](https://feeny.ai/job/rotational-analyst-2027-leadership-development-program-london-ion-group-london-zecqy3qhy7k0) — London, United Kingdom
- [Software Developer, 2027 Leadership Development Program, Woking](https://feeny.ai/job/software-developer-2027-leadership-development-program-woking-ion-group-woking-63fhjhq1v5zm) — Woking, United Kingdom
- [Technical Product Analyst, 2027 Leadership Development Program, ION Group, India](https://feeny.ai/job/technical-product-analyst-2027-leadership-development-program-ion-group-india-kn703f25v8pb) — Noida, India
- [Software Developer, 2027 Leadership Development Program, ION Group, India](https://feeny.ai/job/software-developer-2027-leadership-development-program-ion-group-india-ion-j3cqyk9whvyn) — Noida, India
- [LAB49 Principal/Lead Android Engineer](https://feeny.ai/job/lab49-principal-lead-android-engineer-ion-group-noida-rfcfnfjb6r9y) — Noida, India
- [LAB49 Senior Android Engineer, Noida](https://feeny.ai/job/lab49-senior-android-engineer-noida-ion-group-noida-fw2xty5cdcd5) — Noida, India
- [PMO Analyst, LAB49 Noida](https://feeny.ai/job/pmo-analyst-lab49-noida-ion-group-noida-0sf170pnrwjh) — Noida, India
- [Integration Analyst](https://feeny.ai/job/integration-analyst-ion-group-jersey-city-0vfdk9gy9g2p) — Jersey City, NJ
- [Senior Android Developer, New York](https://feeny.ai/job/senior-android-developer-new-york-ion-group-new-york-s8jj5raqz0vm) — New York, NY