Upstream tech stack
Upstream builds mostly with Java, SQL, Python, Go. Its stack also includes ElasticSearch, Redis, Linux, Apache Kafka. ElasticSearch is named in 6 of the 11 job postings Upstream published in the last 12 months (55%). Counted by Alion from the job postings of Upstream, updated Oct 1, 2026.
What programming languages does Upstream use?
Java is named in 45% of job postings at Upstream, followed by SQL (45%), Python (36%), Go (18%).
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What frameworks and libraries does Upstream use?
Hazelcast is named in 27% of job postings at Upstream, followed by Hibernate (27%), Spring Framework (27%), Express (9%).
What databases does Upstream use?
ElasticSearch is named in 55% of job postings at Upstream, followed by Redis (55%), Couchbase (27%), PostgreSQL (27%).
What cloud and platforms does Upstream use?
Linux is named in 36% of job postings at Upstream, followed by Apache Kafka (27%), Kubernetes (27%), RabbitMQ (27%).
Apache Kafka
3 27%
Kubernetes
3 27%
RabbitMQ
3 27%
AWS
2 18%
Azure
2 18%
GitLab
2 18%
GitLab CI
2 18%
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What developer tools does Upstream use?
Git is named in 27% of job postings at Upstream, followed by Maven (27%), Ansible (18%), Docker (18%).
Git
3 27%
Maven
3 27%
Ansible
2 18%
Docker
2 18%
Helm
2 18%
Jenkins
2 18%
Loki
2 18%
Prometheus
2 18%
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Which engineering practices does Upstream ask for?
CI/CD is named in 55% of job postings at Upstream, followed by A/B Testing (9%), TCP/IP (9%).
What does each Upstream team work with?
The technologies each team's postings require most often, with the number of postings that require them.
Backend
3 postingsHow does your stack fit Upstream?
How is the Upstream 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 Upstream stack?
Upstream scores 73 out of 100 (Modern). The score averages how current each technology in the stack is and adds weight for AI adoption. AI technologies in the stack: 0; legacy ones: 0.
How common is the Upstream stack in its industry?
Share of the 277 companies in the same industries, whose stack Alion knows, that use each technology.
What sets Upstream apart
Companies with a stack like Upstream
Questions about the Upstream tech stack
What programming languages does Upstream use?
The languages named in Upstream job postings are Java (45%), SQL (45%), Python (36%), Go (18%), PHP (18%), as a share of the 11 postings of the last 12 months.
Does Upstream use Hazelcast?
Yes. Hazelcast is named in 3 of 11 job postings (27%) and required in 3 of them.
What cloud and platforms does Upstream use?
The cloud and platforms named in Upstream job postings are Linux (4), Apache Kafka (3), Kubernetes (3) (postings in brackets).
What skills do you need for a Backend job at Upstream?
Backend postings at Upstream most often require Apache Kafka (3), ElasticSearch (3), Git (3), Hazelcast (3), out of 3 postings in the last 12 months.
Is the Upstream tech stack changing?
Yes. Microsoft Excel, Kubernetes, PostgreSQL, AWS first appeared in Upstream job postings in the last six months.
How modern is the Upstream tech stack?
Upstream scores 73 out of 100 (Modern). The score averages how current each technology in the stack is and adds weight for AI adoption. AI technologies in the stack: 0; legacy ones: 0.
How does Alion know the Upstream tech stack?
Alion reads every job posting Upstream publishes and tags the technologies each one names. The figures on this page count the 11 postings of the last 12 months and were updated on Oct 1, 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, "Upstream tech stack: 47 technologies from 11 job postings", as of Oct 1, 2026. https://alion.io/company/upstreamsystems/technologies