John Costello: Email & Phone Number

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Software Engineer at Krumware|New York City Metropolitan Area, United States

Position:

Software Engineer at Krumware

Location:

New York City Metropolitan Area, United States

View John Costello's Email

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Last updated: 2026-05-27

Updated: 2026-05-27

Found email addresses for John Costello:

Business emails:

j**n@krum.io,

j*******o@krum.io

Personal emails:

c***@core-states.com,

c***@hotmail.com,

j***@gmail.com,

j***@hardestyhanover.com

Found phones for John Costello:

+1-323-***-**14,

+1-323-***-**24

A different John Costello?

Work Experience 5 years

Software Engineer at Krumware

Jun 2024 - Current

Software Engineer at Svelvet (Open Source)

Sep 2023 - Dec 2023

Structural Engineer Intern at Core States Group

May 2022 - Aug 2022

Structural Engineer Intern at H&H

May 2021 - Aug 2021

John Costello started working in 2021, then the employee has changed 3 companies and 1 job. On average, John Costello works for one company for 8 months.

Their professional focus is Agile Methodologies, bcrypt, and Cascading Style Sheets (CSS) across 3 core areas.

Education

Master of Science - MS at Virginia Tech

Advanced Residency for Software Engineering at Codesmith

Bachelor of Science - BS at The College of New Jersey

Frequently Asked Questions

What is John Costello's email address?

SignalHire found verified email addresses for John Costello, both business and personal. Their business email is j**n@krum.io, and personal emails include c***@core-states.com, c***@hotmail.com, and j***@gmail.com.

What is John Costello's phone number?

SignalHire found multiple verified phone numbers for John Costello: +1-323-***-**14, and +1-323-***-**24.

How do I contact John Costello at Krumware?

You can reach John Costello through SignalHire by unlocking their verified email and direct phone number (free signup, no credit card needed). SignalHire is the fastest route if you need their contact details immediately.

What is John Costello's professional background?

John Costello has 5 years of professional experience. They have held roles including Software Engineer, Structural Engineer Intern, and Structural Engineer Intern at companies such as Svelvet (Open Source), Core States Group, and H&H. Their education includes Master of Science - MS from Virginia Tech, and Advanced Residency for Software Engineering from Codesmith.

Is John Costello's contact information up to date?

Yes. John Costello's SignalHire profile was last updated on 27 May 2026, reflecting their current position as Software Engineer at Krumware in Columbia, South Carolina, United States.

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