2,065,486open jobs
121,825companies
241,342added this week
Browse all
Salary
≈ $102k – $189k per year (Estimated)
Location
In office (Lisle)
Seniority
Senior · 5+ years exp
Visa
No sponsorship (stated in the posting)

Confirmed on the employer's own hiring board on Oct 30, 2026. First seen by Alion on Oct 25, 2026.

Overview
Company
Impact
Profile match
IT staffing and recruiting experts with 25 years of experience. Connect with technical recruiters who are engineers themselves for precise talent matching.

Job Title: Senior Software Engineer (.NET/React Developer)

Primary Location: Lisle, IL (4 days Onsite)

Position Type: Contract

OVERVIEW

TalentFish is casting a line for a Senior Software Engineer (.NET/React Developer) to contribute to the My International Sales (MIS) product initiative. The ideal candidate is proficient in both .NET Core and ReactJS, has experience across the full software development lifecycle using an Agile framework, and is skilled in modernizing and enhancing existing web applications while ensuring long-term application performance. This person should be comfortable supporting mission-critical systems while leading modernization initiatives that improve scalability, reliability, automation, security, observability, and long-term maintainability, and should work effectively in a collaborative, fast-paced environment.

WHAT YOU BRING TO THE ROLE. (IDEAL EXPERIENCE)

  • Minimum 5+ years of development experience with ASP.NET / .NET Core using C# (and/or VB.NET) in Visual Studio IDE

  • Minimum 3+ years of development experience with ReactJS

  • Experience developing Web APIs in .NET Core

  • Experience writing extensive unit tests and Web API testing

  • Good understanding of security, performance, and scalability considerations

  • Experience modernizing legacy ASP.NET Web Forms applications to .NET Core + React

  • Strong understanding of HTML, XML, CSS, JSON, JavaScript, and jQuery

  • Expert-level knowledge of SQL, including writing complex queries and stored procedures

  • Skilled in working with SOAP and REST services

  • Good understanding of object-oriented programming (OOP) principles

  • Understanding of the GitFlow branching strategy and deployments

  • Familiarity with deploying to Kubernetes clusters

  • Understanding of SOLID design principles

  • Experience with code refactoring and design patterns

  • Familiarity with ADO or JIRA

  • Experience with CI/CD, deployment pipelines, infrastructure-as-code, containerization, or DevOps practices

  • Familiarity with TFS and Git

  • Familiarity with Azure

  • Strong understanding of technical best practices to support an agile environment

  • Familiarity with Telerik is a plus

  • Ability to work independently and as part of a team

  • Bachelor's degree in Computer Science, Information Systems, Engineering, or a related field; equivalent experience may be considered

WHAT YOU'LL DO. (SKILLS USED IN THIS POSITION)

  • Contribute full stack development work (.NET Core and ReactJS) to the My International Sales (MIS) product initiative

  • Participate in the full software development lifecycle using an Agile framework

  • Modernize and enhance existing web applications, including migrating legacy ASP.NET Web Forms applications to .NET Core + React

  • Develop and test Web APIs in .NET Core, including writing extensive unit tests

  • Support mission-critical systems while leading modernization initiatives that improve scalability, reliability, automation, security, observability, and long-term maintainability

  • Write and optimize complex SQL queries and stored procedures

  • Work with SOAP and REST services and apply OOP and SOLID design principles in day-to-day development

  • Collaborate using GitFlow branching strategy, CI/CD pipelines, and containerized deployments (including Kubernetes)

  • Work effectively in a collaborative, fast-paced environment alongside cross-functional team members

Compensation Information:

The expected salary range for this position is 65-70/hr depending on experience and qualifications. This role also qualifies for comprehensive benefits such as health insurance, 401(k), and paid time off. TalentFish is committed to pay transparency and equal opportunity. The salary range provided is in compliance with applicable state and federal regulations.

This role requires authorization to work in the U.S. without current or future visa sponsorship.

All offers are contingent upon the completion of a background check, which may include but is not limited to reference checks, education verification, employment verification, drug testing, criminal records checks, and any required certifications or compliance requirements based on the end client's background check policies and applicable laws.

TalentFish is an employee-owned company pioneering a new realm in talent acquisition. We are redefining IT staffing by evolving AI, video screening, and our unique platform. TalentFish focuses on providing the best employee, consultant, and client experience possible.

At TalentFish we are an Equal Opportunity Employer; we embrace and encourage diversity!

Free account
Stop reading job ads. Get the ones that fit.
One free account turns this page into a shortlist built around your stack, your level and your pay.
Match on every job. Stack, seniority, pay and location, scored against your profile.
2,065,486 open roles. Read straight off company career pages, refreshed every day.
Unlimited applications. Every one you send is tracked in one place, on-site or on a company board.
3 tailored CVs a month. Rewritten for the exact job you are applying to. Included free.
Create a free account Continue with Google
Free forever. No card. Under a minute.

Your match

How well do you fit this role?
Two answers are enough for a real match. No account needed.
Check my fit
Answers stay in this browser until you create an account.

Recommended for you based on this role

Backend
Similar stack
Same company
Lisle
$214k – $356k per year · Equity · Remote (United States) · Full-Time · 12+ years exp · Bachelor's Degree · New York · San Francisco · Washington
Go
Java
C++
AI/ML
Model Context Protocol
AI Agents
Agentic Workflows
DevOps
GCP
containerd
Azure
AWS
Docker
Kubernetes
Linux
Cybersecurity
Threat Modeling
LDAP
Apply
$187k – $308k per year · Equity · Hybrid · Full-Time · 8+ years exp · Bachelor's Degree · San Jose · New York
Python
Go
Databases
ClickHouse
Apache Kafka
AI/ML
Multimodal AI
AI Agents
LLM
Galileo
DevOps
Splunk
OpenTelemetry
Apply
$156k – $234k per year · Hybrid · Full-Time · 10+ years exp · Bachelor's Degree · Irving
Java
Java
Spring Boot
Spring Security
Spring Cloud
Databases
Apache Kafka
AI/ML
Copilot
Cursor
Claude Code
Model Context Protocol
Prompt Engineering
AI Agents
LLM
RAG
Hallucination
Devin
LLM Guardrails
Agentic Workflows
DevOps
Rest API
gRPC
Terraform
Ansible
GCP
OpenShift
Helm
GitHub Actions
Azure
CI/CD
Jenkins
AWS
Kubernetes
Tekton
Backstage
Argo Workflows
API Gateway
Cybersecurity
Kyverno
Apply
$113k – $136k per year · In office · Full-Time · 5+ years exp · Bachelor's Degree · Richmond
Design
SolidWorks
Apply
≈ $99k – $184k per year (Estimated) · In office · Full-Time · 6+ years exp · Bachelor's Degree · Burlington
Python
JavaScript
SQL
Node JS
AI/ML
Copilot
ChatGPT
NLP
Semantic Search
Machine Learning
DevOps
Rest API
Terraform
GitHub Actions
CI/CD
Jenkins
AWS
Docker
Kubernetes
GitHub
SOAP
Management
Agile
Scrum
Apply
$155k – $200k per year · Equity · Hybrid · Full-Time · 8+ years exp · Bachelor's Degree · Austin
Python
SQL
AI/ML
AI Agents
NLP
RAG
Machine Learning
DevOps
GCP
Azure
AWS
Management
Agile
Apply
≈ $53k – $102k per year (Estimated) · In office · Contractor · 15+ years exp · Bachelor's Degree · Fredericton
SQL
PowerShell
C#
C#
.NET
Databases
MS SQL
Apply
≈ $77k – $201k per year (Estimated) · In office · 10+ years exp · Master's Degree · Brussels
Databases
Databricks
AI/ML
MLFlow
AI Agents
LLM
RAG
Machine Learning
DevOps
Azure
CI/CD
Kubernetes
Platform Engineering
FinOps
Apply
$70k – $92k per year · In office · Full-Time · 2+ years exp · Bachelor's Degree · Columbus
AI/ML
Model Context Protocol
DevOps
Rest API
CI/CD
Apply
≈ $54k – $103k per year (Estimated) · In office · Contractor · Bachelor's Degree · Fredericton
Java
SQL
Databases
Oracle
MS SQL
DevOps
Linux
Analytics
SSIS
Apply
≈ $138k – $259k per year (Estimated) · In office · Chicago
Apply
Stationary Engineer 4 days ago
$80k – $90k per year · In office · 2+ years exp · High School Diploma · Newark
Apply
$92k – $144k per year · Hybrid · 8+ years exp · Bachelor's Degree · Chicago
Python
PowerShell
Cybersecurity
Crowdstrike
Qualys Cloud Platform
HIPAA
Delinea
SIEM
DLP
Apply
$123k – $165k per year · In office · Bachelor's Degree · Bridgewater Township
Python
SQL
AI/ML
Machine Learning
DevOps
GCP
Apply
Remote (United States) · United States
Python
Apply
$52k – $56k per year · In office · Internship · Bachelor's Degree · Lisle
Apply
$21k – $57k per year · In office · Contractor · Bachelor's Degree · Lisle · Bedford
Apply
$90k – $190k per year · In office · TS/SCI · Full-Time · 4+ years exp · Bachelor's Degree · Lisle
Python
Java
SQL
Databases
Apache Iceberg
ElasticSearch
AI/ML
Spark
Airflow
LoRA
Model Context Protocol
vLLM
AI Agents
Langfuse
PEFT
QLoRA
LLM
RAG
Reranking
KServe
Agentic Workflows
DevOps
Terraform
GitLab CI
CI/CD
Kubernetes
Apply
Cook 1 day ago
$42k – $50k per year · In office · Full-Time · Lisle
Apply
$130k – $170k per year · In office · 8+ years exp · Lisle
Apply
See all jobs
This is one of many
2,065,486 more open roles from verified company boards, updated every day.