HASH on cord

HASH

Integrations Engineer

External position
London, UK
Hiring internally for HASH?
Technology
Open-source data, modeling and generative simulation platform
Posted
2 weeks ago
Checked
cord regularly checks that external positions are still open
23 hours ago

Skills & Experience

Job roles: Back End
Experience level: Mid, Senior
Core skills considered: Typescript, Python, APIs, HTTP
Other skills considered: REST, GraphQL, Unit Testing, Integration Testing

Logistics

Base salary: £80K - £130K
Employment type: Permanent
Remote working: On-site
Visa sponsorship: Not available

Job Description

A large part of HASH's utility is its ability to integrate structured data from a wide-range of external applications into a single, unified knowledge and process graph. Each SaaS application, communication tool, internal service or specialized enterprise system has its own authentication model, API conventions, rate limits, schemas, failure modes and ideas about time. HASH needs to connect to these systems reliably, preserve where information came from and keep its model synchronized as the source changes. We're hiring an Integrations Engineer to work on these problems.

You will design and implement connectors in TypeScript and Python, making both widely used services and customer-specific systems straightforward to connect to HASH. This includes understanding each source in detail, retrieving and synchronizing its data reliably, and mapping its native concepts into common semantic schemas that remain useful beyond a single integration. While some services provide excellent public APIs, complete schemas and thoughtful documentation... others provide only incomplete documentation, inconsistent endpoints or no public documentation for the behavior we are authorized to integrate with. You should enjoy both situations. You may find yourself studying an SDK, inspecting browser network traffic, comparing payloads, testing undocumented behavior and working out how an application really functions-then turning that understanding into a connector that is robust, respectful of permissions and maintainable as the service changes.

Different systems use different names, structures and assumptions for the same real-world concepts, while superficially similar fields may mean different things. You should find the idea of how a Salesforce account, an SAP business partner, a row in a customer database and an organization found on the web can map into shared types without erasing their provenance or source-specific meaning.

This is not a role for writing disposable scripts, and you will be supported in the role by a team working on the surrounding integration infrastructure. Your main output will be excellent connectors: new ones developed quickly and carefully, and existing ones kept working as upstream services and HASH evolve.

You will work closely with core platform engineers, AI Success Engineers and customer-facing colleagues. Sometimes you will be adding support for a widely used SaaS product. Sometimes you will need to understand a customer's unusual internal API or data model. In both cases, your responsibility is to produce something accurate, maintainable, secure and observable enough to remain dependable after the initial implementation. You will also be expected to leverage AI effectively in this role.


Requirements

  • Strong production experience with both TypeScript and Python
  • Experience personally building and maintaining multiple connectors to third-party APIs, SDKs, databases or services
  • A solid understanding of HTTP, REST, GraphQL, webhooks, OAuth 2.0 and common authentication patterns
  • A genuine appetite for reverse-engineering poorly documented integration surfaces by reading client code, inspecting network behavior, testing hypotheses and comparing real payloads
  • Experience handling the realities of external systems: pagination, rate limits, partial failure, retries, deduplication, idempotency, eventual consistency and breaking API changes
  • An obsession with semantic modeling: the ability to identify the real-world concepts behind unfamiliar data and map them into common types without discarding source-specific meaning
  • Experience building asynchronous or event-driven services, including queues, workers, scheduling and backfills
  • Strong testing instincts, including unit, integration, contract and end-to-end testing where appropriate
  • The ability to diagnose failures across several systems using logs, metrics, traces and careful reproduction
  • Good security judgment around credentials, secrets, permissions, tenant isolation and sensitive customer data
  • High agency and the ability to take an integration from incomplete documentation and a real customer need to a dependable production implementation
  • Clear written and spoken communication, including the ability to work directly with customers and external technical teams when necessary

You do not need experience with every system HASH may connect to. You do need to learn unfamiliar services quickly, notice the edge cases that documentation omits and enjoy the investigative work required to discover how a system actually behaves.

Experience with ERP or supply-chain systems, Salesforce, Microsoft 365, Google Workspace, Slack, data warehouses, object stores, message brokers, Airbyte, Meltano, Singer, OpenAPI, MCP or similar integration ecosystems is useful. So is experience with schema registries, change-data capture, data lineage, temporal data, knowledge graphs or two-way synchronization.


What you'll do

  • Build new connectors between HASH and SaaS applications, communications tools, enterprise services and customer APIs
  • Maintain existing connectors as upstream APIs, authentication flows, payloads and product behavior change
  • Work comfortably from excellent public API documentation when it exists
  • Reverse-engineer poorly documented or unofficial integration surfaces where authorized and appropriate, using network inspection, client behavior, SDKs, experiments and careful validation
  • Design reliable full and incremental synchronization, including pagination, checkpoints, backfills and recovery after partial failure
  • Implement OAuth, API-key and service-account authentication flows and manage credentials securely
  • Consume webhooks and event streams, and reconcile them with polling or scheduled sync where necessary
  • Build safe two-way synchronization that respects source-system permissions and avoids loops, duplication or unintended writes
  • Determine what external fields and objects actually mean, rather than mechanically reproducing their source shape
  • Map heterogeneous source schemas into common HASH entity, relationship and property types while preserving source identity, provenance, time and important source-specific distinctions
  • Reconcile several services' representations of the same real-world concepts and improve shared semantic schemas as new evidence appears
  • Handle schema and API evolution without silently corrupting or dropping customer data
  • Create realistic fixtures, mocks and contract tests for third-party systems that are difficult to reproduce locally
  • Write clear documentation for users and engineers creating or operating integrations
  • Work with AI Success Engineers and customers to understand source systems, data semantics and deployment constraints
  • Feed repeated connector requirements back to the engineers who own HASH's surrounding integration infrastructure
  • Contribute improvements back to HASH's open-source codebases
  • Use AI-assisted development thoughtfully to accelerate connector implementation and schema mapping while retaining responsibility for correctness and maintainability
Integrations Engineer at HASH
Position posted 2 weeks ago

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Starling Bank on cord

Starling Bank

Full Stack Engineer (ML Ops)

London, UK
FinTech · Banking · Finance
A better bank for everyone
Active
over 6 months ago
Responds to
0% of requests
Responds in
1h 55m
Requests
7 pending

Skills & Experience

Job roles: Full Stack
Experience level: Mid, Senior
Core skills considered: Java, React, Redux, AWS, JavaScript

Logistics

Base salary: £70K - £110K
Employment type: Permanent
Remote working: Hybrid (up to 2 remote days p/w)
Visa sponsorship: Not available

Job Description

Starling is the UK’s first and leading digital bank on a mission to fix banking! Our vision is fast technology, fair service, and honest values. All at the tap of a phone, all the time.

Starling is the UK’s first and leading digital bank on a mission to fix banking! We built a new kind of bank because we knew technology had the power to help people save, spend and manage their money in a new and transformative way.

We’re a fully licensed UK bank with the culture and spirit of a fast-moving, disruptive tech company. We’re a bank, but better: fairer, easier to use and designed to demystify money for everyone. We employ more than 3,000 people across our London, Southampton, Cardiff and Manchester offices.

Our technologists are at the very heart of Starling and enjoy working in a fast-paced environment that is all about building things, creating new stuff, and disruptive technology that keeps us on the cutting edge of fintech. We operate a flat structure to empower you to make decisions regardless of what your primary responsibilities may be, innovation and collaboration will be at the core of everything you do. Help is never far away in our open culture, you will find support in your team and from across the business, we are in this together!

The way to thrive and shine within Starling is to be a self-driven individual and be able to take full ownership of everything around you: From building things, designing, discovering, to sharing knowledge with your colleagues and making sure all processes are efficient and productive to deliver the best possible results for our customers. Our purpose is underpinned by five Starling values: Listen, Keep It Simple, Do The Right Thing, Own It, and Aim For Greatness.

Hybrid Working

We have a Hybrid approach to working here at Starling - our preference is that you're located within a commutable distance of one of our offices so that we're able to interact and collaborate in person. We don't like to mandate how much you visit the office and work from home, that's to be agreed upon between you and your manager.

Our Data Environment

Our Data teams are excited about the value of data within the business, powers our product decisions to improve things for our customers and enhance effective and agile decision making, regardless of what their primary tech stack may be. Hear from the team in our latest blogs or our case studies with Women in Tech.

We are looking for talented data professionals at all levels to join the team. We value people being engaged and caring about customers, caring about the code they write and the contribution they make to Starling. People with a broad ability to apply themselves to a multitude of problems and challenges, who can work across teams do great things here at Starling, to continue changing banking for good.

Requirements

We have built our entire banking platform in house and mostly in Java. We are looking for people who want to work on building the tooling that is used by our engineers on a daily basis.

We are looking for people who are truly full stack, and are as comfortable polishing their javascript front end as they are debugging the innards of their java applications database interactions, or standing up infrastructure with terraform. We are looking for people who can:

  • Design REST apis.
  • Code backend services, ideally using Java, or another other server side compiled language.
  • Develop modern front ends, ideally using React and Redux.
  • Get their code into the cloud and support it there, ideally on AWS.
  • Believe in clean coding, simple solutions, automated testing and continuous deployment.
  • Like to take ownership of a feature from the original idea through to live.
  • Think (like us) that a small number of empowered developers is the right way to deliver software.

Company Benefits

  • 33 days holiday (including flexible bank holidays)
  • An extra day’s holiday for your birthday
  • 16 hours paid volunteering time a year
  • Part-time and/or flexible hours available for most roles
  • Salary sacrifice, company enhanced pension scheme
  • Life insurance at 4x your salary
  • Hybrid/remote working
  • Private Medical Insurance with VitalityHealth including mental health support and cancer care. Partner benefits include discounts with Waitrose, Mr&Mrs Smith and Peloton
  • Generous family-friendly policies
  • Varied social groups set up and run by our employees
  • Perkbox membership giving access to retail discounts, a wellness platform for physical and mental health, and weekly free and boosted perks
  • Access to initiatives like Cycle to Work, Salary Sacrificed Gym partnerships and Electric Vehicle (EV) leasing

Full details are available on our careers site

Interview Process

Interviewing is a two way process and we want you to have the time and opportunity to get to know us, as much as we are getting to know you! Our interviews are conversational and we want to get the best from you, so come with questions and be curious. In general you can expect the below, following a chat with one of our Talent Team:

  • Stage 1 - 30 mins with one of the team
  • Stage 2 - Take home challenge
  • Stage 3 - 90 mins technical interview with two team members
  • Stage 3 - 45 min final with an executive and a member of the people team
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