H1 tech stack
H1 builds mostly with Python, SQL, JavaScript, Java. Its stack also includes AWS, Spark, ElasticSearch, PostgreSQL. Python is named in 16 of the 23 job postings H1 published in the last 12 months (70%). Counted by Alion from the job postings of H1, updated Sep 28, 2026.
What programming languages does H1 use?
Python is named in 70% of job postings at H1, followed by SQL (52%), JavaScript (22%), Java (17%).
Python
16 70%
SQL
12 52%
JavaScript
5 22%
Java
4 17%
Node JS
4 17%
Scala
4 17%
Go
4 17%
TypeScript
3 13%
Show all (11)
What frameworks and libraries does H1 use?
Nest.JS is named in 9% of job postings at H1, followed by React.js (9%), LangChain (9%), Entity Framework Core (4%).
Show all (10)
What databases does H1 use?
ElasticSearch is named in 26% of job postings at H1, followed by PostgreSQL (22%), Amazon Redshift (13%), Apache Hudi (4%).
ElasticSearch
6 26%
PostgreSQL
5 22%
Amazon Redshift
3 13%
Apache Hudi
1 4%
BigQuery
1 4%
Delta Lake
1 4%
Google BigQuery
1 4%
Snowflake
1 4%
What cloud and platforms does H1 use?
AWS is named in 48% of job postings at H1, followed by Spark (48%), Kubernetes (39%), Amazon S3 (26%).
AWS
11 48%
Spark
11 48%
Kubernetes
9 39%
Apache Kafka
6 26%
Databricks
4 17%
AWS Lambda
3 13%
Airflow
3 13%
Show all (21)
What developer tools does H1 use?
pySpark is named in 30% of job postings at H1, followed by Docker (17%), Git (17%), Copilot (17%).
pySpark
7 30%
Docker
4 17%
Git
4 17%
Copilot
4 17%
Terraform
3 13%
CircleCI
2 9%
dbt
2 9%
Claude Code
2 9%
Show all (11)
What AI and ML technologies does H1 use?
Claude is named in 26% of job postings at H1, followed by LLM (9%), ChatGPT (4%).
Which engineering practices does H1 ask for?
CI/CD is named in 26% of job postings at H1, followed by ETL/ELT (22%), Knowledge Graph (9%), Machine Learning (9%).
CI/CD
6 26%
RAG
2 9%
AI Agents
1 4%
NLP
1 4%
Show all (10)
What does each H1 team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Backend
9 postingsData Science
4 postingsProduct
3 postingsHow does your stack fit H1?
How much does H1 pay by technology?
Median stated pay of the postings that name each technology, against the median of all H1 postings with stated pay: $175k across 15 postings.
| Technology | Postings with pay | Median | vs company median |
|---|---|---|---|
| Python | 10 | $183k | +4% |
| Spark | 7 | $220k | +26% |
| AWS | 7 | $190k | +9% |
| SQL | 7 | $175k | 0% |
| Apache Kafka | 5 | $220k | +26% |
How is the H1 stack changing?
Read from the dates of the postings themselves: a technology is new when the first posting that names it appeared in the last six months, rising or falling when its share of postings moved between the last two quarters.
How modern is the H1 stack?
H1 scores 90 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: 3; legacy ones: 0.
How common is the H1 stack in its industry?
Share of the 176 companies in the same industries, whose stack Alion knows, that use each technology.
Companies with a stack like H1
Questions about the H1 tech stack
What programming languages does H1 use?
The languages named in H1 job postings are Python (70%), SQL (52%), JavaScript (22%), Java (17%), Node JS (17%), as a share of the 23 postings of the last 12 months.
Does H1 use Nest.JS?
Yes. Nest.JS is named in 2 of 23 job postings (9%) and required in 2 of them.
What cloud and platforms does H1 use?
The cloud and platforms named in H1 job postings are AWS (11), Spark (11), Kubernetes (9) (postings in brackets).
What skills do you need for a Backend job at H1?
Backend postings at H1 most often require Python (7), AWS (6), ElasticSearch (6), Kubernetes (6), out of 9 postings in the last 12 months.
Is the H1 tech stack changing?
Yes. dbt, OpenAI, Nest.JS, React.js first appeared in H1 job postings in the last six months.
How modern is the H1 tech stack?
H1 scores 90 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: 3; legacy ones: 0.
How does Alion know the H1 tech stack?
Alion reads every job posting H1 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 Sep 28, 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, "H1 tech stack: 74 technologies from 23 job postings", as of Sep 28, 2026. https://alion.io/company/h1/technologies