Firstsource tech stack
Firstsource builds mostly with Python, SQL, C#, JavaScript. Its stack also includes AWS, Azure, PostgreSQL, Angular. AWS is named in 14 of the 23 job postings Firstsource published in the last 12 months (61%). Counted by Alion from the job postings of Firstsource, updated Oct 11, 2026.
What programming languages does Firstsource use?
Python is named in 35% of job postings at Firstsource, followed by SQL (35%), C# (26%), JavaScript (22%).
C# 
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What frameworks and libraries does Firstsource use?
Angular is named in 17% of job postings at Firstsource, followed by LangChain (17%), ASP.NET Core (13%), CrewAI (13%).
Angular
4 17%
LangChain
4 17%
ASP.NET Core
3 13%
CrewAI
3 13%
Entity Framework Core
3 13%
React.js
3 13%
Blazor
2 9%
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What databases does Firstsource use?
PostgreSQL is named in 17% of job postings at Firstsource, followed by MS SQL (13%), MySQL (13%), Redis (9%).
PostgreSQL
4 17%
MS SQL
3 13%
MySQL
3 13%
Redis
2 9%
DynamoDB
1 4%
Azure Cosmos DB
1 4%
Azure SQL Database
1 4%
What cloud and platforms does Firstsource use?
AWS is named in 61% of job postings at Firstsource, followed by Azure (61%), GCP (30%), AWS Lambda (22%).
AWS
14 61%
Azure
14 61%
GCP
7 30%
AWS Lambda
5 22%
Apache Kafka
5 22%
Kubernetes
5 22%
Azure DevOps
4 17%
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What developer tools does Firstsource use?
Rest API is named in 35% of job postings at Firstsource, followed by Docker (26%), Git (17%), Terraform (17%).
Rest API
8 35%
Docker
6 26%
Git
4 17%
Terraform
4 17%
CloudFormation
2 9%
WebRTC
2 9%
Ansible
1 4%
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What AI and ML technologies does Firstsource use?
LLM is named in 13% of job postings at Firstsource.
LLM
3 13%
Which engineering practices does Firstsource ask for?
CI/CD is named in 48% of job postings at Firstsource, followed by AI Agents (35%), Hallucination (17%), Agentic Workflows (13%).
CI/CD
11 48%
AI Agents
8 35%
Hallucination
4 17%
RAG
3 13%
SLI/SLO/SLA
3 13%
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What does each Firstsource team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Backend
9 postingsLeadership
3 postingsAI/ML
3 postingsHow does your stack fit Firstsource?
How modern is the Firstsource stack?
Firstsource scores 76 out of 100 (Cutting-edge). The score averages how current each technology in the stack is and adds weight for AI adoption. AI technologies in the stack: 1; legacy ones: 0.
How common is the Firstsource stack in its industry?
Share of the 264 companies in the same industries, whose stack Alion knows, that use each technology.
What sets Firstsource apart
Companies with a stack like Firstsource
Questions about the Firstsource tech stack
What programming languages does Firstsource use?
The languages named in Firstsource job postings are Python (35%), SQL (35%), C# (26%), JavaScript (22%), TypeScript (17%), as a share of the 23 postings of the last 12 months.
Does Firstsource use Angular?
Yes. Angular is named in 4 of 23 job postings (17%) and required in 4 of them.
What cloud and platforms does Firstsource use?
The cloud and platforms named in Firstsource job postings are AWS (14), Azure (14), GCP (7) (postings in brackets).
What skills do you need for a Backend job at Firstsource?
Backend postings at Firstsource most often require SQL (7), C# (6), AWS (5), Azure (5), out of 9 postings in the last 12 months.
Is the Firstsource tech stack changing?
No new technology has appeared in Firstsource job postings in the last six months.
How modern is the Firstsource tech stack?
Firstsource scores 76 out of 100 (Cutting-edge). The score averages how current each technology in the stack is and adds weight for AI adoption. AI technologies in the stack: 1; legacy ones: 0.
How does Alion know the Firstsource tech stack?
Alion reads every job posting Firstsource publishes and tags the technologies each one names. The figures on this page count the 23 postings of the last 12 months and were updated on Oct 11, 2026.
Method and citation
Alion reads every job posting the company publishes and tags the technologies each one names. Shares count the postings of the last 12 months, open and closed; the company's own products are counted apart. How we count
Alion, "Firstsource tech stack: 90 technologies from 23 job postings", as of Oct 11, 2026. https://alion.io/company/firstsource/technologies