# Arena - **Answer**: Arena builds mostly with Python, TypeScript, JavaScript, Go. Its stack also includes PostgreSQL, Next.js, React.js, Spark. LLM is named in 14 of the 37 job postings Arena published in the last 12 months (38%). Counted by Alion from the job postings of Arena, updated Nov 12, 2026. - **Window days**: 365 - **Postings analysed**: 37 - **Open postings**: 16 - **Technologies in use**: 94 - **Modernity score**: 75 - **Ai adoption**: yes - **License**: CC BY-SA 4.0 ## Company - **Id**: 1017 - **Name**: Arena - **Domain**: arena.ai - **Url**: ## Technologies - **AI Agents** — Layer: practices; Postings: 37; Share: 1; Required: 37; Open postings: 16; First seen: 2025-12-18 - **LLM** — Layer: ai; Postings: 14; Share: 0.3784; Required: 9; Open postings: 5; First seen: 2025-12-18 - **Python** — Layer: languages; Postings: 13; Share: 0.3514; Required: 11; Open postings: 4; First seen: 2025-12-18 - **TypeScript** — Layer: languages; Postings: 12; Share: 0.3243; Required: 6; Open postings: 5; First seen: 2025-12-18 - **Machine Learning** — Layer: practices; Postings: 11; Share: 0.2973; Required: 5; Open postings: 5; First seen: 2025-12-18 - **PostgreSQL** — Layer: data; Postings: 10; Share: 0.2703; Required: 4; Open postings: 3; First seen: 2025-12-18 - **JavaScript** — Layer: languages; Postings: 9; Share: 0.2432; Required: 4; Open postings: 3; First seen: 2025-12-18 - **Go** — Layer: languages; Postings: 7; Share: 0.1892; Required: 7; Open postings: 2; First seen: 2025-12-18 - **SQL** — Layer: languages; Postings: 7; Share: 0.1892; Required: 6; Open postings: 2; First seen: 2025-12-18 - **Next.js** — Layer: frameworks; Postings: 7; Share: 0.1892; Required: 1; Open postings: 3; First seen: 2025-12-18 - **React.js** — Layer: frameworks; Postings: 7; Share: 0.1892; Required: 1; Open postings: 3; First seen: 2025-12-18 - **RLHF** — Layer: practices; Postings: 6; Share: 0.1622; Required: 6; Open postings: 2; First seen: 2025-12-18 - **Reinforcement Learning** — Layer: practices; Postings: 6; Share: 0.1622; Required: 5; Open postings: 2; First seen: 2025-12-18 - **Radix UI** — Layer: frameworks; Postings: 6; Share: 0.1622; Required: 2; Open postings: 2; First seen: 2025-12-18 - **Tailwind CSS** — Layer: frameworks; Postings: 6; Share: 0.1622; Required: 0; Open postings: 2; First seen: 2025-12-18 - **Vitest** — Layer: frameworks; Postings: 6; Share: 0.1622; Required: 0; Open postings: 2; First seen: 2025-12-18 - **shadcn/ui** — Layer: frameworks; Postings: 6; Share: 0.1622; Required: 0; Open postings: 2; First seen: 2025-12-18 - **Fine-tuning** — Layer: practices; Postings: 5; Share: 0.1351; Required: 5; Open postings: 2; First seen: 2025-12-18 - **PyTorch** — Layer: frameworks; Postings: 5; Share: 0.1351; Required: 5; Open postings: 2; First seen: 2025-12-18 - **Spark** — Layer: cloud; Postings: 5; Share: 0.1351; Required: 4; Open postings: 1; First seen: 2025-12-18 - **AWS** — Layer: cloud; Postings: 5; Share: 0.1351; Required: 2; Open postings: 2; First seen: 2026-06-29 - **GCP** — Layer: cloud; Postings: 5; Share: 0.1351; Required: 2; Open postings: 2; First seen: 2026-06-29 - **Supabase** — Layer: cloud; Postings: 5; Share: 0.1351; Required: 0; Open postings: 1; First seen: 2025-12-18 - **Vercel** — Layer: cloud; Postings: 5; Share: 0.1351; Required: 0; Open postings: 1; First seen: 2025-12-18 - **Contrastive Learning** — Layer: practices; Postings: 4; Share: 0.1081; Required: 4; Open postings: 1; First seen: 2025-12-18 - **DPO** — Layer: practices; Postings: 4; Share: 0.1081; Required: 4; Open postings: 1; First seen: 2025-12-18 - **Diffusion Models** — Layer: practices; Postings: 4; Share: 0.1081; Required: 4; Open postings: 1; First seen: 2025-12-18 - **JAX** — Layer: frameworks; Postings: 4; Share: 0.1081; Required: 4; Open postings: 1; First seen: 2025-12-18 - **NLP** — Layer: practices; Postings: 4; Share: 0.1081; Required: 4; Open postings: 1; First seen: 2025-12-18 - **TensorFlow** — Layer: frameworks; Postings: 4; Share: 0.1081; Required: 4; Open postings: 1; First seen: 2025-12-18 - **Transformers** — Layer: frameworks; Postings: 4; Share: 0.1081; Required: 4; Open postings: 1; First seen: 2025-12-18 - **Anthropic** — Layer: cloud; Postings: 4; Share: 0.1081; Required: 3; Open postings: 1; First seen: 2026-07-16 - **Databricks** — Layer: cloud; Postings: 4; Share: 0.1081; Required: 3; Open postings: 1; First seen: 2025-12-18 - **OpenAI** — Layer: cloud; Postings: 4; Share: 0.1081; Required: 3; Open postings: 1; First seen: 2026-07-16 - **Redis** — Layer: data; Postings: 4; Share: 0.1081; Required: 3; Open postings: 1; First seen: 2026-07-16 - **Terraform** — Layer: tools; Postings: 4; Share: 0.1081; Required: 2; Open postings: 2; First seen: 2025-12-18 - **LangChain** — Layer: frameworks; Postings: 4; Share: 0.1081; Required: 0; Open postings: 1; First seen: 2026-07-16 - **LiteLLM** — Layer: frameworks; Postings: 4; Share: 0.1081; Required: 0; Open postings: 1; First seen: 2026-07-16 - **vLLM** — Layer: cloud; Postings: 4; Share: 0.1081; Required: 0; Open postings: 1; First seen: 2026-07-16 - **CI/CD** — Layer: practices; Postings: 3; Share: 0.0811; Required: 3; Open postings: 2; First seen: 2026-02-23 - **Snowflake** — Layer: data; Postings: 3; Share: 0.0811; Required: 3; Open postings: 1; First seen: 2025-12-18 - **World Models** — Layer: practices; Postings: 3; Share: 0.0811; Required: 3; Open postings: 1; First seen: 2026-07-16 - **Kubernetes** — Layer: cloud; Postings: 3; Share: 0.0811; Required: 2; Open postings: 1; First seen: 2026-07-16 - **Delta Lake** — Layer: data; Postings: 3; Share: 0.0811; Required: 0; Open postings: 1; First seen: 2025-12-18 - **Envoy** — Layer: tools; Postings: 3; Share: 0.0811; Required: 0; Open postings: 1; First seen: 2026-07-16 - **Kong** — Layer: tools; Postings: 3; Share: 0.0811; Required: 0; Open postings: 1; First seen: 2026-07-16 - **Vercel AI SDK** — Layer: frameworks; Postings: 3; Share: 0.0811; Required: 0; Open postings: 1; First seen: 2025-12-18 - **A/B Testing** — Layer: practices; Postings: 2; Share: 0.0541; Required: 2; Open postings: 0; First seen: 2026-06-29 - **Node JS** — Layer: languages; Postings: 2; Share: 0.0541; Required: 2; Open postings: 0; First seen: 2026-04-22 - **Ray** — Layer: frameworks; Postings: 2; Share: 0.0541; Required: 2; Open postings: 1; First seen: 2025-12-18 - … 44 more in the JSON form ## Changes ### First appeared - **Figma** — First seen: 2026-10-29 - **Azure** — First seen: 2026-09-24 - **World Models** — First seen: 2026-07-16 - **Kubernetes** — First seen: 2026-07-16 - **Envoy** — First seen: 2026-07-16 - **Kong** — First seen: 2026-07-16 - **Rust** — First seen: 2026-07-16 - **Anthropic** — First seen: 2026-07-16 ### Falling - **SQL** — Share from: 31; Share to: 0 - **Python** — Share from: 38; Share to: 18 - **RLHF** — Share from: 19; Share to: 0 - **Reinforcement Learning** — Share from: 19; Share to: 0 - **Databricks** — Share from: 19; Share to: 0 - **Go** — Share from: 25; Share to: 9 - **Machine Learning** — Share from: 31; Share to: 18 - **PostgreSQL** — Share from: 31; Share to: 18 ### Not seen 180d - **Reward Modeling** — Last seen: 2025-12-18 ## Similar stacks - [Artefact](https://alion.io/company/artefact-com/technologies) — Shared technologies: 63 - [Caylent](https://alion.io/company/caylent/technologies) — Shared technologies: 64 - [Fireworks AI](https://alion.io/company/fireworks/technologies) — Shared technologies: 63 - [Zillow](https://alion.io/company/zillow/technologies) — Shared technologies: 63 - [DoorDash](https://alion.io/company/doordash-usa/technologies) — Shared technologies: 77 - [Scale AI](https://alion.io/company/scale-ai/technologies) — Shared technologies: 69 - [Snowflake](https://alion.io/company/snowflake/technologies) — Shared technologies: 81 - [Reddit](https://alion.io/company/reddit/technologies) — Shared technologies: 62 --- [Page](https://alion.io/company/arena/technologies) · [JSON](https://alion.io/company/arena/technologies.json) Source: Alion (alion.io), 2026-11-12. 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